摘要
研究了始穗后弱光对3个杂交稻组合的物质积累、分配、运转、穗部性状与产量的影响。结果表明,随光强降低,干物质生产和积累的速度减慢,净同化率降低,穗后累积的干物质量大幅度减少,茎鞘贮藏性光合产物的输出率及转化率高于对照,品种间有差异,干物质分配到穗中的比例低于对照。遮光极显著地降低了水稻的产量,遮光49%和69%时,产量分别降低40 1%和62 1%,主要是极显著地影响了稻穗结实,结实率分别下降27 8%和44 2%;粒重,特别是弱势粒重及籽粒充实率随光强的减弱也显著降低。
The effect of low-light stress after 10% panicles heading on accumulation, distribution and transformation of plant dry matters and panicle characteristics and Yield of three varieties of hybrid rice are studied. The results show that the production, distribution and transformation of plant dry matters are obviously affected by shading. The average net assimilation rate (NAR) and dry matters production per day in low light treatments are less than the control. On the contrary, the export and transformation percentage of the dry matters in stems and sheaths (EPMSS and TPMSS) increase under low-light stress. Under low-light stress, the distribution percentage of dry matter to leaves, stems and sheaths increase, and panicles decreased in relation to the control. Grains yield of rice is significantly affected by shading. The 49% and 69% shaded treatments produce a mean yield depression of 40.1% and 62.1%. The seed-setting rate is reduced 27.8% by 49%-shade and 44.2% by 69%-shade. The grains weight of low light treatments is significantly lower than the control.
出处
《四川农业大学学报》
CSCD
2003年第4期292-296,共5页
Journal of Sichuan Agricultural University
基金
四川省攻关项目。
