孕穗期干旱胁迫对寒地粳稻干物质积累、转运及产量形成影响

干旱缺水是限制水稻产量主要环境因素之一。为探讨孕穗期干旱胁迫对寒地粳稻干物质积累规律及产量形成影响,选用耐旱型品种东农425和干旱敏感型品种松粳6号为试验材料。通过盆栽结合人工控水方式于孕穗期控制土壤水势至0、-10、-25和-40kPa,处理21d后恢复正常灌溉。研究孕穗期不同程度干旱胁迫对寒地粳稻干物质积累分配转运、产量及产量构成因素影响。结果表明,孕穗期干旱胁迫导致地上部干物质积累量、转运量均随土壤水势降低而下降。成熟期不同器官干物质分配表现为籽粒〉茎鞘〉叶,茎鞘干物质和源器官干物质分配比例及源/库随干旱程度上升而增加,而籽粒干物质分配比例与其相反。抗旱性强品种在干旱胁迫条件下有较强物质...

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Published in东北农业大学学报 Vol. 47; no. 11; pp. 1 - 8
Main Author 赵宏伟 田雪飞 于美芳 沙汉景 贾琰 李艳玲
Format Journal Article
LanguageChinese
Published 东北农业大学水稻研究所,哈尔滨,150030 2016
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ISSN1005-9369

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Summary:干旱缺水是限制水稻产量主要环境因素之一。为探讨孕穗期干旱胁迫对寒地粳稻干物质积累规律及产量形成影响,选用耐旱型品种东农425和干旱敏感型品种松粳6号为试验材料。通过盆栽结合人工控水方式于孕穗期控制土壤水势至0、-10、-25和-40kPa,处理21d后恢复正常灌溉。研究孕穗期不同程度干旱胁迫对寒地粳稻干物质积累分配转运、产量及产量构成因素影响。结果表明,孕穗期干旱胁迫导致地上部干物质积累量、转运量均随土壤水势降低而下降。成熟期不同器官干物质分配表现为籽粒〉茎鞘〉叶,茎鞘干物质和源器官干物质分配比例及源/库随干旱程度上升而增加,而籽粒干物质分配比例与其相反。抗旱性强品种在干旱胁迫条件下有较强物质积累优势,贮藏物质转运能力明显高于抗旱性较弱品种。干旱胁迫使枝梗性状下降,对枝梗性状影响表现为二次枝梗〉一次枝梗。干旱胁迫下寒地粳稻由于每穴穗数、穗粒数和结实率显著降低造成产量显著下降,降幅随土壤水势降低而逐渐上升。
Bibliography:drought stress; dry matter accumulation; dry mater translocation; yield; yield com- ponents
23-1391/S
Water shortage is a main environmental factor that constrains rice production. In order to investigate the effects of drought stress at booting stage on dry matter accumulation and yield formation of cold-region rice, Drought-tolerant cold-region rice variety Dongnong425 and drought- sensitive cold-region rice variety Songjing6 were selected as test materials. Through pot experiment which combined with artificial water control to control soil water potential at booting stage to 0, -10, -25 and-40 kPa, ended with 21 d after treatment. The effects of different drought stress on dry matter accumulation, transportation, partitioning, yield and its components of cold-region rice were studied. Results showed that the drought treatment lead to both the dry matter accumulation of above-ground part and the translocation decreased with the decrease of soil water potential. Dry matter distribution of different organs to g
ISSN:1005-9369