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田间生长的大麦,大多数分蘖不能成穗结实。增加有效分蘖的比例可提高产量。本研究的目的是确定大麦有效和无效分蘖的同化物质分配方式,监估计分蘖过早衰老对产量的影响。1983和1984年在美国明尼苏达州圣保罗的沃基根地区的砂壤土上采用多次重复,完全随机区纽设计进行了田间试验。整个分蘖及分蘖的单个叶片在每个试验中都用~(14)CO_2标记进行了示踪,示踪后给以24小时的转移期。结果表明,三个供试基因型的主蘖的同化物质分配方式没有差异,无效分蘖比有效分蘖分配给主茎的同化物质比例要大,这部分同化物质主要被主茎的茎秆及新生叶片吸收。拔节开始后,有效分蘖向主茎运输的同化物质就更少了。在这期间分蘖茎从有效分蘖固定的同化物质获得大部分养分。作者根据这些试验结果认为,分蘖,特别是无效分蘖,在拔节初期可能为主茎提供了大量的同化物质,监可以此作为估价大麦分蘖农艺价值的一个因素。
Barley grown in the field, most of the tiller can not become ear-spike. Increasing the proportion of effective tillers can increase yields. The purpose of this study was to determine the assimilation patterns of effective and ineffective tillers in barley and to assess the effects of premature tillering on yield. Field experiments were conducted on sandy loam soil in the Waukegan area of St. Paul, Minnesota, USA in 1983 and 1984 using multiple replicates of the completely randomized New Zealand design. Individual leaves of the entire tillering and tillering were traced with ~ (14) CO 2 labeling in each experiment, followed by a 24-h transfer period. The results showed that there was no difference in the distribution pattern of assimilative substances between the main tillers of the three tested genotypes. The proportion of ineffective tillers was larger than that of the effective tillers assigned to the main stems, and this part of the assimilative substances was mainly regulated by the stems of the main stems and the new leaves absorb. After the jointing starts, there is even less assimilation material transported by the effective tillers to the main stem. During this period tillering stalks receive most of the nutrients from the assimilates immobilized on the tiller. According to the results of these experiments, the authors believe that tillers, especially ineffective tillers, may provide a large amount of assimilation material for the main stem at the early stage of jointing, which may be used as a factor to evaluate the agronomic value of barley tillers.