Using intersubspecific hybrid rice Xieyou 9308 and Liangyou Peijiu as the tested materials, the effects of differentirrigation patterns on transportation and allocation of carbohydrate during grain filling stage was o...Using intersubspecific hybrid rice Xieyou 9308 and Liangyou Peijiu as the tested materials, the effects of differentirrigation patterns on transportation and allocation of carbohydrate during grain filling stage was observed by the designwith three level of soil water content in irrigated field. The results showed that in the conventional flooding and thealternate dry-watering cultivations, the exported rate of stored carbohydrate from stem and photophate from the leaves were60 and 90 % respectively. The exported rate of carbohydrate was decreased significantly (P<0.01) in the non-floodingcultivation. There was no significant difference between the conventional flooding and dry-wet alternation treatments interm of the exported rate of carbohydrate. The filling grains were the major sinks for carbohydrate storage during grainfilling stage. Grains received nearly 50% of stored carbohydrate from leaf sheath and 80% of photophate from leaves. Atthe nonflooding condition the absorbing rates of grains were significantly decreased by 10 % from leaf sheath and 20 %from leaves photophate. Water stress leaded much decrease in absorbing ability for inferior grains, which might be one ofthe main causes for low seed-settling rate in non-flooding cultivation.展开更多
为探究孕穗期冷水灌溉下粳稻籽粒灌浆过程中的干物质、氮素形成积累规律及氮代谢关键酶调控效应，以东农428和松粳10为材料，设置6个冷水灌溉持续时间（0、3、6、9、12和15 d），分析孕穗期冷水灌溉对寒地粳稻籽粒灌浆过程中的干物质、...为探究孕穗期冷水灌溉下粳稻籽粒灌浆过程中的干物质、氮素形成积累规律及氮代谢关键酶调控效应，以东农428和松粳10为材料，设置6个冷水灌溉持续时间（0、3、6、9、12和15 d），分析孕穗期冷水灌溉对寒地粳稻籽粒灌浆过程中的干物质、氮素积累及氮代谢关键酶活性的影响。结果表明，与对照相比，孕穗期冷水灌溉下，寒地粳稻产量及籽粒干物质积累量的变化规律一致，冷水灌溉持续时间越长，产量及籽粒干物质积累量降幅越大。冷水灌溉下，寒地粳稻籽粒干物质积累量降低，除与籽粒干物质最大相对积累速率降低有关外，还与结实率降低、有效穗数和每穗总粒数减少有关。冷水灌溉可提高寒地粳稻籽粒全氮、蛋白氮、成熟期籽粒粗蛋白含量及灌浆前期籽粒谷氨酰胺合成酶（GS）活性。冷水灌溉6 d 可显著提高籽粒谷草转氨酶（GOT）及谷丙转氨酶（GPT）活性，冷水灌溉9~15 d 可显著降低其活性。短期冷水灌溉下（3~6 d），寒地粳稻通过增强有机氮同化过程，促进蛋白质合成，使籽粒氮素含量增加；长期冷水灌溉下（9~15 d），籽粒有机氮同化过程受到抑制，影响氨基酸和蛋白质的合成，最终导致籽粒氮素增幅下降。籽粒全氮、蛋白氮和淀粉颗粒态结合蛋白是不同耐冷性品种响应冷水胁迫的差异产物，其含量可作为耐冷性鉴定的指标。展开更多
基金This work was sponsored by the Span Plan of the Minis-try of Agriculture of China(MOA)(2003-01)the Spe-cial Key Project for Planting Pattern Reform of MOA of China(2003-01-02AZhejiang Provincial Project,China(2004C32016).
文摘Using intersubspecific hybrid rice Xieyou 9308 and Liangyou Peijiu as the tested materials, the effects of differentirrigation patterns on transportation and allocation of carbohydrate during grain filling stage was observed by the designwith three level of soil water content in irrigated field. The results showed that in the conventional flooding and thealternate dry-watering cultivations, the exported rate of stored carbohydrate from stem and photophate from the leaves were60 and 90 % respectively. The exported rate of carbohydrate was decreased significantly (P<0.01) in the non-floodingcultivation. There was no significant difference between the conventional flooding and dry-wet alternation treatments interm of the exported rate of carbohydrate. The filling grains were the major sinks for carbohydrate storage during grainfilling stage. Grains received nearly 50% of stored carbohydrate from leaf sheath and 80% of photophate from leaves. Atthe nonflooding condition the absorbing rates of grains were significantly decreased by 10 % from leaf sheath and 20 %from leaves photophate. Water stress leaded much decrease in absorbing ability for inferior grains, which might be one ofthe main causes for low seed-settling rate in non-flooding cultivation.
文摘为探究孕穗期冷水灌溉下粳稻籽粒灌浆过程中的干物质、氮素形成积累规律及氮代谢关键酶调控效应，以东农428和松粳10为材料，设置6个冷水灌溉持续时间（0、3、6、9、12和15 d），分析孕穗期冷水灌溉对寒地粳稻籽粒灌浆过程中的干物质、氮素积累及氮代谢关键酶活性的影响。结果表明，与对照相比，孕穗期冷水灌溉下，寒地粳稻产量及籽粒干物质积累量的变化规律一致，冷水灌溉持续时间越长，产量及籽粒干物质积累量降幅越大。冷水灌溉下，寒地粳稻籽粒干物质积累量降低，除与籽粒干物质最大相对积累速率降低有关外，还与结实率降低、有效穗数和每穗总粒数减少有关。冷水灌溉可提高寒地粳稻籽粒全氮、蛋白氮、成熟期籽粒粗蛋白含量及灌浆前期籽粒谷氨酰胺合成酶（GS）活性。冷水灌溉6 d 可显著提高籽粒谷草转氨酶（GOT）及谷丙转氨酶（GPT）活性，冷水灌溉9~15 d 可显著降低其活性。短期冷水灌溉下（3~6 d），寒地粳稻通过增强有机氮同化过程，促进蛋白质合成，使籽粒氮素含量增加；长期冷水灌溉下（9~15 d），籽粒有机氮同化过程受到抑制，影响氨基酸和蛋白质的合成，最终导致籽粒氮素增幅下降。籽粒全氮、蛋白氮和淀粉颗粒态结合蛋白是不同耐冷性品种响应冷水胁迫的差异产物，其含量可作为耐冷性鉴定的指标。
