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189
VII/2/2016
InterdIscIplInarIa archaeologIca
natural scIences In archaeology
homepage: http://www.iansa.eu
Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species
in Archaeobotanical Assemblages
Michal Hejcman
a,b,c*
, Lukáš Hlísnikovský
a,c
, Pavla Hejcmanová
d
, Tereza Šálková
e
, Jaromír Beneš
e
a
Department of Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences, Kamýcká 129, 165 21 Prague 6 – Suchdol, Czech Republic
b
Department of Archaeology, Faculty of Arts, University of Hradec Králové, Rokitanského 62, 500 03 Hradec Králové, Czech Republic
c
Crop Research Institute Prague – Ruzyně, Drnovská 507, 161 06 Prague 6 – Ruzyně, Czech Republic
d
Faculty of Tropical AgriSciences, Czech University of Life Sciences, Kamýcká 129, 165 21, Prague 6 – Suchdol, Czech Republic
e
Laboratory of Archaeobotany and Palaeoecology, Faculty of Science, University of South Bohemia, Na Zlaté stoce 3, 370 05 České Budějovice, Czech Republic
1. Introduction
The grains of cereals belong to the most frequently recorded
remains of cultural plants in archaeological assemblages.
Since the start of agriculture in the European Neolithic
up to Roman Times, the main cereals were hulled wheats,
diploid
Triticum monococcum
(einkorn, 2n=14, Zaharieva,
Monneveux 2014) and tetraploid
T. dicoccum
(emmer,
2n=28, Kreuz
et al.
2005; Zaharieva
et al.
2010). Since the
Neolithic or Bronze age, respectively, hulled and naked
Hordeum vulgare
(barley) together with
Panicum milliaceum
(common millet) were also commonly planted, and
T.
dicoccum
was still the main staple crop (Hajnalová 1993;
Bernardová
et al.
2010; Šálková
et al.
2012; Festi
et al.
2011;
Zohary
et al.
2012; Dreslerová
et al.
2013). Hexaploid wheat
species such as hulled
T. spelta
(spelt, 2n = 42) and naked
T. aestivum
(baker wheat, 2n = 42) appeared in central Europe
from the Late Bronze Age (Beneš, Přikrylová 2008; Kočár,
Dreslerová 2010). Since the La Tène period, the intentional
planting of the formerly weedy cereal species
Secale cereale
(rye),
Avena sativa
(oat), and
Hordeum vulgare
(barley)
became more common (Zohary
et al.
2012; Dreslerová
et al.
2013). Roman Times were characterised by the planting of
H. vulgare
, followed by
T. dicoccum
,
Panicum
, and by naked
wheat (probably
T. aestivum
),
Avena
and
Secale
(Preiss
et al.
2005; Dreslerová, Kočár 2013). From the Migration period,
naked wheat (
T. aestivum
the most probably) prevailed
Volume VII ● Issue 2/2016 ● Pages 189–196
*Corresponding author. E-mail: hejcman@fzp.czu.cz
ARTiCLE inFo
Article history:
Received: 4
th
March 2016
Accepted: 28
th
December 2016
Key words:
emmer wheat
einkorn
barley
millet
oats
macroremain analysis
AbSTRACT
The importance of diferent cereals for human and animal nutrition in diferent historical periods has
been frequently estimated according to the proportion of grains of individual cereal species from the
total number of recorded grains in the archaeological assemblage. However, such presentations do not
respect the diferences in grain size among particular species. The aim of this study was to compare
the kernel weights of cereal species planted in Europe since the Neolithic up to the frst half of the
20
th
century and to propose recalculation coefcients for their relevant comparison. Thousand kernel
weights (TKW) of cereals were obtained from the Evigez database and from the available literature.
Taking the TKW of
Triticum aestivum
(44.6 g) as 100%, the descending order of cereal species
in terms of their TKW in relation to
T. aestivum
was
T. spelta
(100%),
T. turgidum
(99%), hulled
Hordeum vulgare
(97%),
T. durum
(92%),
T. dicoccum
(88%), naked
H. vulgare
(81%),
Secale cereale
(79%),
T. dicoccoides
(76%),
T. monococcum
(67%), hulled
Avena sativa
(66%), naked
A. sativa
(64%) and fnally
Panicum miliaceum
(12%). We recommend the use of these proposed recalculation
coefcients for the comparison of proportions of cereal grains in archaeobotanical assemblages. The
recalculated values better refect the importance of the diferent cereal species for human economies
and nutrition rather than simple proportions of the recorded grains of an individual species. The
recalculation coefcients are particularly important in the case of a high proportion of
P. miliaceum
in an archaeological assemblage, as its grain size difers the most from the other frequently-recorded
cereals.
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Michal Hejcman, Lukáš Hlísnikovský, Pavla Hejcmanová, Tereza Šálková, Jaromír Beneš: Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species in Archaeobotanical Assemblages
190
followed by
Hordeum
,
Secale
,
Avena
and
T. dicoccum
(Brombacher, Hecker 2015). At the start of the 20
th
century,
Secale
was the main crop (having the largest cropping
area in the Czech Republic), followed by
Avena
(Figure 1).
The cropping area of
T. aestivum
and
Hordeum
was lower
than half of the cropping area of
Secale
and
Avena
in the
1930s. The proportion of individual cereal crops completely
changed after World Word II, and since the 1960s up to the
present the main cereal crop has been
T. aestivum
followed
by
Hordeum
;
Avena
and
Secale
have both become marginal
crops with negligible cropping area. The planting of
T.
monococcum
and
T. dicoccum
has
completely disappeared.
In the 21
st
century, the renaissance of hulled wheat planting
(
T. monococcum
,
T. dicoccum
and
T. spelta
) in Europe has
been connected with the spread of organic farming and the
increased interest in products with a high nutritional quality
(Marino
et al.
2009, 2011; Konvalina
et al.
2012a). Although
hulled
Hordeum
varieties dominate in contemporary Europe,
hull-less (naked) varieties have been planted in the past and
used for food production (Lister, Jones 2013). In central
Europe, their planting was popular during the Bronze Age and
then its use steeply declined (Šálková
et al.
2012). In northern
Europe, naked barley represented approximately 50% of the
Neolithic and Bronze Age barley records (Lister, Jones 2013).
In mountain regions of Asia, such as the uplands of China,
India, Nepal, Pakistan, Japan, both Koreas and Tibet, naked
varieties of
Hordeum
are still planted and used as a staple crop
for food production (Saisho, Purugganan 2007). In central
Europe, naked barley was recorded as a relict of traditional
mountain agriculture in an archaeobotanical assemblage from
the 18
th
century AD (Beneš, Kočár 2000).
The importance of diferent cereals for human and
animal nutrition in diferent historical periods is a key
point in archaeobotanical investigations, but there are
vital methodological issues in its evaluation. It has been
frequently estimated according to the proportion of grains
of an individual cereal species from the total number of
recorded grains in the archaeological assemblage. This is
the simplest and most frequently-used way of presenting the
data, but comes with low predictive value as to which cereal
species are/were important for human and animal nutrition,
thus making interpretations problematic. The problem with
such a presentation is that it disregards the diferences in
grain size among particular species. For example, the grain of
Panicum
is much smaller than the grain of
T. aestivum
. The
value of one
Panicum
grain for human nutrition is therefore
substantially lower than the value of one grain of
T. aestivum
.
To make an adequate comparison of the grains of diferent
cereal species in archaeological assemblages, a recalculation
of their numbers according to their importance for human
nutrition or economy is necessary. The simplest way to do
this is to use the kernel (grain) weights. In agronomy, a
thousand kernel weight (TKW – the weight of a 1000 seeds)
is one of the basic agronomic traits used to characterize the
grain size of diferent crops and their varieties (
e.g.
Peleg
et al.
, 2011; Guarda
et al.
, 2004).
Taking account of the missing recalculation coefcients
for the comparison of diferent cereals, the aim of this
study was to compare the kernel weights of cereal species
planted in Europe since the Neolithic up to the frst half of
the 20
th
century and to propose recalculation coefcients
for their relevant comparison. As an example, we then
Figure 1.
Proportion of cropping area of
Triticum aestivum
(wheat),
Secale cereal
(rye),
Hordeum vulgare
(barley),
Avena sativa
(oats) and
Zea mays
(grain
maize) from total cropping area in the Czech Republic from 1920 to 2012 (according to Czech Statistical Ofce).
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Michal Hejcman, Lukáš Hlísnikovský, Pavla Hejcmanová, Tereza Šálková, Jaromír Beneš: Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species in Archaeobotanical Assemblages
191
used an archaeological assemblage from the Late Bronze
Age to demonstrate the application and importance of the
recalculation coefcient.
2. Material and methods
2.1 Thousand kernel weights of diferent cereals and
recalculation coefcients
To provide a comparison of the kernel weights of cereal
species planted in Europe since the Neolithic up to the
frst half of the 20
th
century, we assembled data on about a
thousand kernel weights (TKW) of old varieties of cereals
registered up to 1960s – as these would be minimally afected
by modern breeding methods. In the case of marginal cereal
species such as
T. monococcum
and
T. dicoccum
, we also used
modern varieties as these have generally only been subjected
to limited breeding in comparison to the frequently-planted
T. aestivum
with its many varieties. The TKW of cereals
were obtained from the gene bank of the Crop Research
Institute Prague – Ruzyně, the database Evigez (plant
genetic resources documentation in the Czech Republic,
http://genbank.vurv.cz/genetic/resources/asp2/default.htm)
– and from the available literature (Codianni
et al.
1996;
Karagöz, Zencirci 2005; Troccoli, Codianni 2005; De Vita
et al.
2006; Marino
et al.
2009, 2011; Pagnotta
et al.
2009;
Ünal 2009; Brandolini
et al.
2011; 2013; Arduiny
et al.
2014). The TKW for each species was visualized in the form
of frequency histograms in order to demonstrate the range of
values and their distribution (Figures 2, 3 and 4). For each
Figure 2.
Distribution of thousand kernel weights of (a)
Triticum monococcum
, (b)
T. dicoccoides
, (c)
T. dicoccum
, (d)
T. durum
, (e)
T. turgidum
and
(f)
T. spelta
.
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IANSA 2016 ● VII/2 ● 189–196
Michal Hejcman, Lukáš Hlísnikovský, Pavla Hejcmanová, Tereza Šálková, Jaromír Beneš: Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species in Archaeobotanical Assemblages
192
Figure 3.
Distribution of thousand kernel weights of (a)
Triticum aestivum
, (b) hulled
Avena sativa
, (c) naked
A. sativa
, (d) hulled
Hordeum vulgare
, (e)
naked
H. vulgare
and (f)
Secale cereale
.
species, we calculated the mean and median values, standard
deviation (SD) and their coefcients in their relation to
T. aestivum
based on their mean and median values. We used
the TKW of
T. aestivum
as the standard for our comparison
with other cereal species because
T. aestivum
is the most
important cereal species in widespread use today. Therefore,
the coefcients were calculated as a ratio of the TKW of a
particular cereal species to the TKW of
T. aestivum
.
2.2 An example of grains in an archaeological
assemblage
A practical application of the recalculation coefcient can
be well demonstrated with an archaebotanical assemblage,
because in the prehistory of Europe, before written historical
records, our knowledge of particular cereal values is
exclusively based on archaeobotanical assemblages. The
model assemblage consists of the analyzed macroremains
of cereals gained during the archaeological excavations of
the Late Bronze Age sites in the Bechyně region (South
Bohemia, Czech Republic, altitude approx. 450 m asl). To
demonstrate the importance of recalculation coefcients,
grain samples from three settlements were used: Černýšovice
– stage Br D – stages according to Jiráň (2008), 13
th
century
BC, Hvožďany – stage Ha A2, 11
th
century BC and Březnice
– stage Ha A2/B1, 1050–1000 BC. Twenty contexts
(146 samples, 1556 litres of feature inflls and cultural layers)
were analysed (for details, see Chvojka
et al.
2011; Chvojka,
Šálková 2012). Macroremains were determined based on
basic literature (Hajnalová 1999; Jacomet 2006) and the
reference collection of the Laboratory of Archaeobotany
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Michal Hejcman, Lukáš Hlísnikovský, Pavla Hejcmanová, Tereza Šálková, Jaromír Beneš: Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species in Archaeobotanical Assemblages
193
and Paleoecology, University of South Bohemia in České
Budějovice. The Number of Identifed Specimens (NISP) of
caryopsis and rachis were counted. Data were transformed;
inaccurate identifcations were counted (
e.g.
Triticum
cf.
spelta
was counted as
T. spelta
;
Triticum spelta/dicoccum
were divided based on their real proportion in studied sites).
Naked
Triticum
caryopses were considered as
T. aestivum
in
this study. The proportions of grains of diferent species were
presented as percentages of the total number of recorded
cereal grains for all three studied localities together.
3. Results
3.1 The thousand kernel weights of diferent cereals
The highest TKW from all the investigated cereal species
was recorded for both the hexaploid wheat species
T. spelta
and
T. aestivum
followed by the tetraploid
T. turgidum
. The
median values of TKW were the same (44.5 g) for all the
above-mentioned
Triticum
species. The mean TKW of other
cereal species decreased in the following order: hulled
H.
vulgare
>
T. durum
>
T. dicoccum
> hull-less
H. vulgare
>
S. cereale
>
T. dicoccoides
>
T. monococcum
> hulled
A.
sativa
> hull-less
A. sativa
>
P. miliaceum
. The median
values of TKW were similar with the mean values for the
majority of species and therefore recalculation coefcients
based on mean and median values were almost the same
(Table 1). There was high variability in the TKW for all the
studied species (Figures 2–4). We recorded almost a normal
distribution for the TKW of
T. durum
,
T. spelta,
T. aestivum,
hulled
A. sativa
,
S. cereale
and
P. miliaceum
. Highly
positively-skewed distributions were found for the TKW of
T. monococcum
and hull-less
H. vulgare
. On the other hand,
Figure 4.
Distribution of thousand kernel
weights of
Panicum miliaceum
.
Table 1.
Thousand kernel weight (TKW – weight of thousand caryopses) of cereals obtained from the literature and database Evigez. n – number of cases,
mean – mean value of TKW, mean coef. – coefcient for comparison of diferent cereals based on mean TKW, median – median value of TKW, median
coef. – coefcient for comparison of diferent cereals based on median TKW, SD – standard deviation.
nMean (g)Mean coef.Median (g)Median coef.SD
Triticum aestivum
2940
44.62
144.515.03
T. monococcum
3530.09
0.67
28.8
0.65
5.95
T. dicoccoides
6
33.83
0.76
34.50.781.98
T. dicoccum
8039.450.8839.350.885.08
T. durum
10041.140.9240.50.917.43
T. turgidum
2344.280.9944.518.23
T. spelta
61
44.75144.510.87
hulled
Avena sativa
156029.60.66
28
0.63
4.33
naked
A. sativa
21028.44
0.64
30
0.67
2.75
hulled
Hordeum vulgare
139443.120.9743.50.984.78
naked
H. vulgare
152
36.35
0.8134
0.763.68
Secale cererale
35935.350.7934
0.766.32
Panicum miliaceum
785.170.125.170.120.72
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Michal Hejcman, Lukáš Hlísnikovský, Pavla Hejcmanová, Tereza Šálková, Jaromír Beneš: Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species in Archaeobotanical Assemblages
194
a highly negatively-skewed distribution was found for the
TKW of hull-less
A. sativa
.
3.2 Example of grains in archaeological assemblage
In the original data obtained from three Late Bronze Age
sites,
P. milliaceum
represented 51% of all cereal caryopses,
but after recalculation, it was only 12% (Figure 5). As
the proportion of
P. milliaceum
decreased substantially
after recalculation, the importance of other cereal species
increased:
H. vulgare
from 19% to 36%,
T. dicoccum
from
18% to 31%,
T. spelta
from 6% to 11%,
T. monococcum
from
3% to 4%,
T. aestivum
from 2% to 4%,
Avena sp.
from 0.3%
to 0.4% and
S. cereale
from 0.1% to 0.2%.
Figure 5.
Proportion of grains of individual species from total number of cereal grains in the archaeological assemblage from the Late Bronze Age based
on a) original proportions of grains and b) recalculated according to proposed coefcients. Coefcients for hulled varieties were applied for recalculations
of
Avena sativa
and
Hordeum vulgare
.
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Michal Hejcman, Lukáš Hlísnikovský, Pavla Hejcmanová, Tereza Šálková, Jaromír Beneš: Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species in Archaeobotanical Assemblages
195
4. Discussion
The main message of our study is that there are large
diferences in kernel weights among the basic cereal
species planted in Europe. We thus recommend the use of
recalculation coefcients based on the weight of grains of
the diferent cereal species in studies of their importance for
human economies and human and animal nutrition. As the
recalculation coefcients based on mean and median values
of TKW were almost the same for all species, we recommend
to use mean values: the mean is a generally better-known and
more widely-used statistical value than the median. Taking the
TKW of
T. aestivum
(44.6 g) as 100%, the cereal species in
relation to
T. aestivum
according to their TKW, in descending
order, is the following:
T. spelta
(100%),
T. turgidum
(99%),
hulled
H. vulgare
(97%),
T. durum
(92%),
T. dicoccum
(88%),
naked
H. vulgare
(81%),
S. cereale
(79%),
T. dicoccoides
(76%),
T. monococcum
(67%), hulled
A. sativa
(66%), naked
A. sativa
(64%) and, fnally,
P. miliaceum
(12%). It can be
argued that there is high variability in the kernel weights
within each cereal species and that recalculation coefcients
are therefore not sufciently accurate. However, the answer
is that though there was really high variability in kernel
weights within each cereal species, the mean values of TKW
characterize the grain weight of each species relatively well
as the mean and median values were almost the same. In spite
of these potential limits, it is hard to fnd a better parameter
than TKW as an estimator of crop yield, and hence suitable
for comparison of the importance of diferent cereal species in
human subsistence. Recalculation coefcients are particularly
important in cases where there is a high proportion of
P.
miliaceum
in the archaeological assemblage, as its grain
size difers the most from other frequently recorded cereals.
This was well demonstrated using the example from the
Late Bronze Age: without recalculation, the most important
seemed to be
P. miliaceum
, but after recalculation, it proved
to be
H. vulgare
followed by
T. dicoccum,
and the importance
of
P. miliaceum
decreased more than four times. There
are two main sources of variability in TKW within each
species: (1) genetic; and (2) phenotypic plasticity. (1) The
genetic component is highly important as there are known
varieties, or landraces, with both low and high kernel weights.
For example, the TKW of
T. monococcum
is higher in
Mediterranean countries than in central European countries.
The mean TKWs of
T. monococcum
landraces from Austria
and Morocco planted together on the same locality were 25
and 36 g, respectively (Brandolini
et al.
2013). A similar
gradient can be recorded as well for
T. dicoccum
. In the
Czech Republic, for example, the mean TKW of
T. dicoccum
landraces ranged approximately from 31 to 34 g (Konvalina
et al.
2012b; 2012c) compared to a mean value of 39 g
recorded by De Vita
et al.
(2006) or 48 g recorded by Marino
et al.
(2011) in Italy. These south-north diferences in the grain
weights of landraces of diferent cereal species indicate that
the recalculation coefcients can be potentially made more
precise by using the Mediterranean and central European
landraces and varieties separately; but this requires further
in-depth research. In both
T. mocococcum
and
T. dicoccum
,
there exist landraces with extraordinary high TKWs, but such
landraces are rare (see Figures 2a and 2c). Evidently, there
was a long-term selection for TKW in both species dependent
on latitude – bigger grains in the Mediterranean compared to
northern regions. In addition, selection for the extraordinary
high TKW was probably not undertaken, as the grain yield
per area cannot be a positive function of TKW because of the
very high grain yield compensation ability in both species.
High grain yields can also be achieved with small grains but
with high grain numbers per area (see Hejcman, Hejcmanová
2015 for grain yield compensation ability of
T. dicoccum
and
T. aestivum
). Whether the same north–south gradient of TKW
in
T. monococcum
and
T. dicoccum
also existed in diferent
historical periods has, according to the information of the
authors, never been studied. As landraces of
T. dicoccum
, but
also
H. vulgare
, might retain a phylogeographical structure
that refects ancient events (Saisho, Purugganan 2007; Isaac
et al.
2010), we believe that the north–south gradient of
TKW can also be recorded for grains from diferent historical
periods, but this hypothesis requires further testing using
ancient grains.
There also exists high phenotypic plasticity in the TKW.
For instance, in the experiment by Hlisnikovský
et al.
(2015),
the TKW ranged from 39.5 to 53.5 g for the same variety of
T.
aestivum
. High TKWs were recorded under high N-application
regimes under optimum water supply and low TKWs were
recorded under no fertilizer application in an extraordinary dry
year. There were also diferences in TKW between localities
with diferent soil types. Hejcman, Hejcmanová (2015)
recorded low TKW for
T. dicoccum
(25 g) in stands with a
high seeding rate and therefore with too a high spike density.
5. Conclusion
Despite the high variability in TKW within each cereal
species, we believe that the proposed recalculation
coefcients for the comparison of grains of diferent cereal
species are meaningful and correct as they are based on a
meta-analysis of large amounts of available data from the
available literature and records from the Evigez database,
and not just on a single experiment with a restricted number
of genotypes for individual cereal species. We recommend
the use of these proposed recalculation coefcients for the
comparison of proportions of cereal grains in archaeobotanical
assemblages. The recalculated values better refect the
importance of diferent cereal species for human and animal
nutrition, as opposed to the simple proportions of recorded
grains of individual species from their total amounts.
Acknowledgement
The research was supported by projects NAZV
QJ1210211, CIGA 20144207, RO0415 and
PAPAVER
CZ.1.07/2.3.00/20.0289.
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Michal Hejcman, Lukáš Hlísnikovský, Pavla Hejcmanová, Tereza Šálková, Jaromír Beneš: Kernel Weights of Triticum, Hordeum, Avena, Secale and Panicum Species
can be used for Better Estimation of Importance of Diferent Cereal Species in Archaeobotanical Assemblages
196
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