| 摘要: |
| 【目的】研究四川常用杂交水稻耐低温潜沼性逆境的差异性，为该逆境下水稻品种的选育奠定基础。【方法】选取四川盆地常用的36个杂交水稻品种为试验材料，采用田间试验的方法，在四川遂宁分别选择低温潜沼性稻田和非低温潜沼性稻田（CK）进行同期种植，观测并分析不同水稻品种的分蘖动态、株高和穗部性状等农艺指标。【结果】1）与非逆境相比，低温潜沼性逆境下，杂交水稻分蘖数和成穗率均显著降低；分蘖数降低程度与T值（水稻对低温潜沼性逆境的耐受指数）间的相关系数为-0.86（P<0.01），成穗率降低程度与T值间的相关系数为-0.88（P<0.01）。2）与非逆境相比，所有参试杂交水稻的穗长在低温潜沼性逆境下均有所缩短，其缩短程度与T值间的相关系数为-0.89（P<0.01）；所有参试杂交水稻的结实率均有所降低，其降低程度与T值间的相关系数为-0.93（P<0.01）。3）杂交水稻对低温潜沼性逆境的耐受能力不同，参试的36个品种中，C优130、C优2095、川香3号、冈优188、泸优5号、内5优306、内5优317和协优027的T值均超过了12，具有较强的耐受能力，其在低温潜沼性逆境下的分蘖数较多，结实率和穗长降低程度较低。4）低温潜沼性逆境下，杂交水稻对低温潜沼性逆境的耐受指数与水稻产量间的相关系数为0.89（P<0.05），与水稻产量降低程度间的相关系数为-0.95（P<0.01）。【结论】T值可以用来评价杂交水稻对低温潜沼性逆境的适应能力，T值越高，在低温潜沼性逆境下产量降低的程度越小。 |
| 关键词: 低温潜沼性逆境 杂交水稻 农艺性状 |
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| 基金项目:国家自然科学基金项目（31401347）；四川省教育厅项目（13ZB0299） |
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| Difference in tolerance capacity of hybrid rice in paddy and low temperature field in Sichuan |
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WANG Hong-ni,WANG Xue-chun,CHEN Yong-jun,et al
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| Abstract: |
| 【Objective】This study investigated the difference in tolerance capacity of hybrid rice in paddy and low temperature environment in Sichuan to provide basis for the selection and breeding of tolerance hybrid rice.【Method】Field experiments were carried out at Suining,Sichuan in paddy and low temperature field and normal rice field (CK),respectively.Using 36 common rice varieties as materials,the number of rice tillers,plant height,panicle trait and other agronomic traits of rice were measured and analyzed.【Result】1) Under paddy and low temperature environment,both tiller number and bearing tiller rate of hybrid rice reduced significantly,the correlation index between the reduction rate of tiller number and tolerance index (T) was -0.86 (P<0.01) and the correlation between the reduction rate of bearing tiller and T was -0.88(P<0.01).2) Compared with normal environment,the panicle length of hybrid rice reduced significantly with the correlation between its reduction rate and T of -0.89 (P<0.01).The setting rate of hybrid rice also decreased significantly with the correlation of -0.93(P<0.01).3) Different hybrid rice had different capacities to tolerant the paddy and low temperature environment.Among the 36 tested hybrid rice,the hybrid rice,C You 130,C You 2095,Chuanxiang 3,Gangyou 188,Luyou 5,Nei 5 You 306,Nei 5 You 317 and Xieyou 027 had high T values (higher than 12),indicating that they had strong capacity to tolerant the paddy and low temperature environment.Therefore,they obtained more tiller and their reduction rates of setting and panicle length were less than that of other hybrid rice.4) Under the paddy and low temperature environment,the correlation index between T and rice yield was 0.89 (P<0.05) while the correlation index between T and the reduced rice yield was -0.95 (P<0.01).【Conclusion】The tolerance index for paddy and low temperature environment (T) can be used to evaluate the capacity of hybrid rice.Higher value indicates that the rice yield reduction will be less in paddy and low temperature field. |
| Key words: paddy and low temperature environment hybrid rice agronomic traits |
