双季晚粳稻稳产性的基因型差异及其生理特性的研究

试验通过对５个不同基因型晚粳稻在不同条件下的栽培，研究了双季晚粳稻稳产性的基因型差异及其生理特性，结果表明：不同基因型晚粳稻的稳产性存在明显差异。在供试的晚粳稻中，以秀水２７的稳产性为最好，其次为秀水１１，更新农虎的稳产性居中，秀水４８的稳产性较差，矮粳２３的稳产性最差，晚粳稻的稳产性与其有效穗数和每穗总粒数及实粒数的可塑性有关，稳产的品种可塑性大。高结实率和高千粒重是高产稳产的有利性状，稳产性好的晚粳稻，其分蘖力中等，单株最高分蘖数和有效穗数相对较稳定，而分蘖成穗率高并具有一定的可塑性，齐穗期的叶面积指数高而且稳定，但单株叶面积则表现为相对的可变性。稳产的品种往往具有单茎干重大而且稳定，收获指数高并具有一定的稳定性。

A Study on the Genotypic Differences in Yield Stability of Late Japanica Rice and Its Physiological Characters

Through the cultivation of five late Japanica rice cultivars in different conditions, the genotypic differences in yield stability and physiological characters of late Japanica rice were studied. The yield stability significantly differs among the late Japanica rice cultivars. The yield stability of Xioushui 27 was the best and Aigeng 23 was the worst among the tested cultivars. The yield stability was related to the variability of the number of available panicles per area and the number of total specklets and full grains per panicle. The high rate of filled grains and weight of 1000 grains were the traits which were beneficial to high and stable yield. The late Japanica rice cultivars with stable yield had moderate tilling capacity and were relatively stable in the maximum number of tillers and the number of available panicles. The rate of productivity tillers was high and easily variabile in the stable yield cultivars. The leaf area index was high and stable,but the leaf area per plant was easily variable at full-heading stage in the stable yield cultivars. The weight of single stem and harvest index were both high and stable in the stable yield cultivars.