【摘要】 以3个不同直链淀粉含量的水稻品种为材料,研究了孕穗期弱光对水稻籽粒灌浆及稻米品质的影响,并用Richards方程拟合籽粒的灌浆过程。结果表明,孕穗期弱光处理后,籽粒终极生长量(A)有所降低,起始灌浆势(R0)、最大灌浆速率(Gmax)、平均灌浆速率(G)的变化则因品种而异;糙米率、精米率显著下降,整精米率、垩白率、直链淀粉及蛋白质含量的变化因品种而异;精米率、糙米率与籽粒A值呈显著或极显著正相关,直链淀粉含量、整精米率与籽粒的R0、Gmax、G呈显著或极显著负相关,垩白率与籽粒的G、R0、Gmax呈显著或极显著正相关。在弱光区,可以采用育种、栽培技术、化学控制等手段来改变与稻米品质密切相关的籽粒灌浆参数值,以减轻弱光胁迫对稻米品质的危害程度。更多还原

【Abstract】 With high,middle and low amylose content rice cultivars as material,influence of weak light during the initial period of young spike on grain-filling and quality in rice was studied.Grain-filling course was simulated by Richards equation.The results showed that,compared with the control, the maximum growth amount of grain（A）,brown rice rate and milled rice rate decreased,the change of initial grain-filling potential（R₀）,maximum grain-filling rate（G_max）,mean grain-filling rate（G）,head milled rice rate,chalky grains rate,amylose and protein contents were different in the 3 varieties.Brown rice rate and milled rice rate were significantly and very significantly positively correlated with A.Amylose content and head rice rate were significantly and very significantly negatively correlated with R₀,G_max and G. Chalky grains rate was significantly and very significantly positively correlated with R₀,G_max and G.In order to release the damage of weak light to rice quality,measures for breeding,growth technology and chemical control could be taken to change the parameters of grain-filling closely correlated with rice quality in weak light districts.更多还原