Grain Filling Mechanisms in Spring Wheat : IV. Effects of shadings on number and size of spikes, grains, endosperm cells and starch granules in wheat
Grain Filling Mechanisms in Spring Wheat : IV. Effects of shadings on number and size of spikes, grains, endosperm cells and starch granules in wheat
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春小麦的灌浆机制：IV。
DOI：
10.1626/jcs.65.277
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发表时间：
1996
影响因子：
--
通讯作者：
T. Kanazawa
中科院分区：
文献类型：
--
作者：
Tadashi Takahashi;T. Kanazawa
研究了遮光处理对小麦穗、籽粒、胚乳细胞和淀粉粒的影响。春小麦（Triticum aestivum L.）CV. Haruyutaka）用95%遮光布覆盖，以便在灌浆初期、初期和后期导致同化失败;初期遮光，从开花前2天到开花后7天;早期遮光，从开花后7天到14天;后期遮光，从开花后14天到21天。结果表明，遮光处理使小麦籽粒产量下降11%，其中第3小花位的籽粒数下降17%，特别是第3小花位的籽粒数下降62%，而各小花位的单粒重下降导致遮光处理的产量下降20%，遮光处理的后期产量下降16%。籽粒重量的减少不是由于胚乳细胞数量的减少，而是由于大淀粉粒尺寸的减小。遮荫对库性状影响的差异可以从籽粒形成的生理过程来解释。
Changes in the number and size of spikes, grains, endosperm cells and starch granules was examined in relation to the limited assimilates caused by shading treatments. Spring wheat canopy (Triticum aestivum L. cv. Haruyutaka) was covered with a 95% shading cloth so as to cause failure in the assimilation at the initial, early and late grain filling phases; initial shading, from two days before anthesis until seven days after anthesis; early shading, from seven days until 14 days after anthesis; and late shading, from 14 days until 21 days after anthesis. The grain yield decreased (11% as compared to no shading) due to a decrease in the number of grains (17%), especially decreasing (62%) at the third floret position in the initial shading, while a decrease of one grain weight at all floret positions resulted in 20% and 16% decreases in the grain yield in early and late shadings, respectively. The reduction of grain weight was not due to a decrease in the number of endosperm cells, but to a decrease in the size of large starch granules. Differences in the effects of shading on changes in sink characters could be explained in terms of the physiological process of grain formation.