Amino acid contents were studied in two new breeds of spring triticale
SGU-164 and SGU-181 from 1995 to 1997 crop in comparison with spring
wheat variety Saxana and winter rye variety Dankovske nov6. Grain samp
les were taken from an agrotechnical field trial conducted at Nov6 Mes
to in Moravia, in a potato production region.'Tab. II shows average va
lues of the amino acids in triticale and in control wheat and rye; the
y are expressed as percentages of total proteins. The comparison inclu
ded sums of essential amino acids (EAK), conditionally essential (PEAK
), nonessential (NEAK) and total amino acids (AK). Both new breeds of
triticale had significantly higher contents of valine, isoleucine, lys
ine and arginine against wheat, of leucine against rye, while methioni
ne and histidine contents were at the level of wheat and rye. Total co
ntent of essential amino acids in both triticales was balanced (33.97%
, 34.25%), and significantly higher than in wheat (32.24%), it was hig
her than in rye (33.07%) in the new breed SGU-181 only. On the other h
and, contents of nonessential amino acids in triticale were highly sig
nificantly lower (48.96%, 49.83%) than in control wheat (58.99%) and r
ye (55.29%) as a result of high contents of proline and glutamic acid
in these cereals. Amino acid contents were influenced by weather condi
tions at the time of grain ripening in the experimental years. They we
re significantly lower in both new breeds of triticale in 1997 (Figs 1
and 2). But the effect of the year on triticale genotype was not dete
rmined. The sum of essential amino acids in triticale was significantl
y higher than in control wheat in the three years of observation. The
effect of applications of differentiated N-fertilizing rates (30, 60,
90 kg N/ha) on amino acid contents in triticale was not large. The con
tents of essential and total amino acids were significantly higher onl
y in the new breed SGU-164 after application of the lowest rate (30 kg
N/ha) in comparison with the rates of 60 and 90 kg N/ha. The sum of e
ssential amino acids in both new breeds of triticale was higher for al
l N-fertilizing rates than in control wheat and rye (insignificantly o
nly in 1997).