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美国北部地区的大麦(Hvrkeum vulgorel L.)种植者需要发育快,成熱早的品种。尽管对大麦的物候发育已作过广泛的研究,但有关独秆特性对大麦生长发育速率的影响还未调查过。本研究的目的是对独秆和普通分蘖型近缘大麦品系的生长发育特点进行比较。于1990年和1991年生长季节期间,在阿拉斯加州的Palmer和Fairbarks,对3对由UC_2(独秆)基因表达的近缘品系间的差异进行了评价,就4种环境平均来看,独秆品种达到二棱期需要更多的生长度-日值(GDD),但达到端点小穗形成期的GDD没有差异(P<.001).独秆品种较普通分蘗型品种达到旗叶全部展开时,每个主茎多0.3片叶,GDD少12,单片叶出现率较普通分蘗型快0.12,成熟期提早23 GDD,株高高出10.9 cm。独秆品种单株每穗粒数减少约2.2粒,而粒重增加约8.4mg.这些结果表明,独秆品种所导致的几种物候发育的有利变化对于那些强调早熟性的地区可能具有实用价值。
Growers of the barley (Hvrkeum vulgorel L.) in the northern United States need fast-growing, hot-early varieties. Although extensive research has been conducted on the phenological development of barley, the effects of single stem traits on the growth and development of barley have not been investigated. The purpose of this study was to compare the growth characteristics between single-stalked and common tillering-related barley lines. During the 1990 and 1991 growing seasons, the differences between three closely related lines expressed by the UC2 (single stalk) gene were evaluated in Palmer and Fairbarks, Alaska. On an average of four environments, There was no significant difference in GDD between the two cultivars reaching the two-pronged stage (GDD), but no difference was found at the end-stage spikelet forming stage (P <.001) , 0.3 leaves per main stem, 12 less GDD, the occurrence rate of single leaf was 0.12 faster than that of normal tillering, 23 GDD earlier in maturity and the height of plant was 10.9 cm. The reduction in grain number per spike for a single-stalk cultivar by about 2.2 grains per grain weight and an increase in grain weight by about 8.4 mg These results suggest that favorable changes in several phenological developments due to a single-stalk variety may be of practical value to those areas that emphasize precocity .