【摘 要】
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In winter wheat, grain development is asynchronous.The grain number and grain weight vary significantly at different spikelet and grain positions among wheat cultivars grown at different plant densiti
【机 构】
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National Key Laboratory of Crop Biology,Agronomy College of Shandong Agricultural University,Tai'an
【出 处】
：
2016年全国青年作物栽培与生理学术研讨会
论文部分内容阅读
In winter wheat, grain development is asynchronous.The grain number and grain weight vary significantly at different spikelet and grain positions among wheat cultivars grown at different plant densities.In this study, two winter wheat (Triticum aestivum L.) cultivars,Wennong6 and Jimai20, were grown under four different plant densities for two seasons, in order to study the effect of plant density on the grain number and grain weight at different spikelet and grain positions.The results showed that grain number, spikelet weight, and grain weight first increased and then decreased with spikelet position from the bottom to the top.The seed-setting traits and grain weight of the main stem spike were superior to those of the tiller spike.The effects of spikelet and grain positions on grain weight varied with the grain number of spikelets.In both cultivars, the single-grain weight of the basal and middle two-grain spikelets was higher at the 2nd grain position than that at the 1st grain position, while the opposite occurred in the top two-grain spikelets.In the three-grain spikelets, the distribution of the single-grain weight was different between cultivars.In the four-grain spikelets of Wennong6, the single-grain weight was the highest at the 2nd grain position, followed by the 1st, 3rd, and 4th grain positions.Regardless of the spikelet and grain positions, the single-grain weight was the highest at the 1st and 2nd grain positions and the lowest at the 3rd and 4th grain positions.Overall, plant density affected the yield by controlling the seed-setting characteristics of the tiller spike.Therefore, wheat yield can be increased by decreasing the sterile basal and top spikelets and enhancing the grain weight at the 3rd and 4th grain positions, while maintaining it at the 1st and 2nd grain positions on the spikelet.
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