Gibberellin-like substances and indole type auxins in developing grains of normal and high lysine genotypes of barley [lysine]
1980
Mounla, M.A.K. | Bangerth, F. | Story, V. (The Swedish Seed Association, Svaloev (Sweden))
Changes in gibberellin-like activity and content of indole type auxins were investigated during grain development of the two high-lysine barley (Hordeum vulgare L.) genotypes Sv 73608 and Risoe 1508, and their corresponding normal cultivars Mona and Bomi. A peak in gibberellin-like activity was found in developing grains of the normal cultivars about 18 days after anthesis, whereas the grains of the high-lysine genotypes showed a two to five times higher maximum about 3-4 days later. The auxin content of the cultivar Bomi showed a maximum between the 22nd and the 29th day after anthesis, whereas throughout their development the grains of the mutant Risoe 1508 exhibited only about 1/10th of the maximum level of auxin found in the grains of Bomi. The normal cultivar Mona also displayed higher contents of auxin than the high-lysine genotypes Sv 73608, particularly at the later stages of grain growth, but the differences in concentration were considerable smaller than for the pair 'Bomi' - 'Risoe 1508'. It is suggested that auxins play an important role in the development of barley grains
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