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不同密度条件对冬小麦小花原基分化的总数有所影响,并制约着小花原基分化数量的增长动态。随着密度的降低,药隔初期之前,小花原基分化的数量增长趋于缓稳,已分化的小花发育进程较为均衡。研究还表明,氮代谢利于小花原基分化,碳代谢促进小花发育。适当降低基本苗数,不但能够改善群体内的光照条件,提高光合能力,增加碳水化合物的供应强度,使药隔初期之前保持一定的小花原基分化速度和平缓的数量增长动态,促进小花发育,而且在小花两极分化的关键时期,改善同化物的分配状况,协调小花的退化动态,这是通过外界因素增加可育小花数,提高穗粒数的生理基础。
The effects of different densities on the total number of primordia differentiation of winter wheat and the growth dynamics of the number of primordium differentiation were restricted. With the decrease of density, the number of floret primordial differentiation tended to be steady before the beginning of drug interval, and the differentiation process of floret was more balanced. The study also showed that nitrogen metabolism favors the differentiation of floret primordia and carbon metabolism promotes the development of floret. Appropriate to reduce the number of basic seedlings, not only to improve the light conditions within the group to improve photosynthetic capacity and increase the supply intensity of carbohydrates, so that before the beginning of the drug to maintain a certain degree of primordia differentiation speed and gentle quantitative growth dynamics and promote floret development, In the critical period of floret polarization, the distribution of assimilates is improved and the degeneration of floret is coordinated. This is the physiological basis for increasing the number of fertile florets by external factors and increasing the number of grains per spike.