Abstract
Five pairs of homozygous winter barley lines, Hordeum vulgare L., isogenic for fully awned or nearly awnless, and their respective recurrent parents were grown in the greenhouse. Awned and awnless isolines in each of the backgrounds were compared to determine the photosynthetic efficiency of flag leaves, and to relate photosynthesis of flag leaf and spike to the awned and awnless condition, as well as to components of grain yield. Only one awnless isoline showed significant advantages in flag leaf photosynthesis when compared to its awned counterpart. The photosynthetic advantage of the MOB-475 awnless isoline appeared both in unit area and whole leaf determinations. Flag leaves of the other lines did not show differences. In all measurements of head-peduncle-flag leaf and head-peduncle combinations, the awned isolines showed highly significant advantages in rates of photosynthesis. In total kernel yield, the mean of awnless isolines was significantly lower than the mean of parents. In kernel weight, the mean of awnless lines was lower than either the parental mean or the mean of awned lines. We can conclude that flag leaves did not compensate for the lack of awns in these lines, and that awns contributed significantly to photosynthesis and to kernel yield.Key words: Barley, photosynthesis, awned, awnless, yield
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