【摘要】 我们在1970—1972年,对四个春小麦品种和一个冬小麦品种进行了 CCC 处理的小区试验及大田试验。处理方法用叶面喷洒或浸种法。结果证明 CCC 对茎秆长度的伸长有抑制作用,但使每株穗数、每穗粒数、每穗粒重及千粒重都增加了,并使籽粒的最后产量提高6—31%。施用 CCC 也引起植株总干重的增大,同时经济产量系数也提高了,说明有更多的物质进入籽粒。在灌浆期中籽粒干重的增长率与茎叶干重的增减量之间有密切联系。在灌浆初期,当籽粒干重增长较慢时,茎叶干重还在增加。但在花后18—30天期间,当籽粒干重的增长率达到高峰期时,茎叶干重的损失量也到达最大值。CCC 处理的籽粒干重增长率在灌浆的前一阶段比对照低,进入高峰期时,处理的籽粒增长率即迅速上升并超过对照,而且以后仍保持较高水平,直至成熟。处理植株的叶片干重损失总量也远比对照为多。这些结果证明了 CCC 对于灌浆后期物质向籽粒中集中与累积的促进作用。更多还原

【Abstract】 In small-plot and field trials with 4 cv.of spring wheat and 1 cv.of winter wheat, CCC was applied as foliar spray or as seed treatment in 1970—1972.In all trials, the application of CCC reduced the stem length and increased the number of ears per plant and the number of grains per ear.The dry weight of grains per ear and the 1000-grain weight were also increased.The final grain yield of the treated plots was 6—31% higher than that of the controls.Application of CCC caused a marked in- crease in total dry weight of the plant and a greater proportion of their total dry matter concentrated in grains than that of the control plants. Increase in dry weight of the grain was closely correlated with the change in dry weight of the leaf and stem.The dry weight of the leaf and stem actually increased at the beginning of the filling period,while the increase in dry weight of the grain was at a low rate.When the increase in grain dry weight reached its maximum about 18—30 days after anthesis,the amount of materials lost from the leaf and stem was also the greatest.The increase in grain dry weight of the CCC treated plants was less than that of the control plants during the first half of the filling period.As the maximum rate of grain dry weight increment approached,however,the increase in grain dry weight of the CCC treated plants rose to much higher rate than that of the controls,and such a high level of increment was maintained by the treated plants until maturity.The total dry matter lost from the leaf of the treated plants was also greater than that from the controls.These results indicated that an important effect of CCC on wheat is to promote the accumulation of materials in grains during the later stage of the filling period.更多还原