Gibberellic acid-sensitive dwarfing genes reduce plant height to increase kernel number and grain yield of wheat.

摘要: The Norin-10 dwarfing genes, Rht-B1b (Rht1) and Rht-D1b (Rht2), have been used to reduce plant height increase grain yield in wheat breeding programs worldwide. Other genes are available of but little is known their effects on yield. A set random, F5-derived lines containing either minor for reduced height, or major gibberellic acid (GA) sensitive Rht8 Rht9 were obtained from 3 different populations. Environment mean yields ranged 2.5 4.6 t/ha. Genotypic variation was large significant (P < 0.05) its components, kernel number size. Approximately 30% as short variety Hartog, while per m2, harvest index, the shortest GA-sensitive not significantly commercial semidwarf checks Janz Hartog. Furthermore, genotypic differences genetically correlated (rg) with (rg = −0.76*), index (−0.71*), (−0.62*). These confirmed retrospective selection consistent reported wheat. Plant among independent seedling characteristics (r2 0.01–0.02 n.s.), a reduced-height produced 50% longer coleoptiles greater biomass than Janz. studies demonstrate correlation between shorter increased yield, suggest potential improving establishment through coleoptile length early vigour.