水稻分蘖田间耐热性鉴定方法  

An effective method of investigating high-temperature tolerance of rice tiller under field conditions

作　　者：肖本泽[1] 赵爽[1] 龚耀[1] 何亮[1] 

机构地区：[1]华中农业大学植物科学技术学院,武汉430070

出　　处：《华中农业大学学报》2011年第5期539-544,共6页Journal of Huazhong Agricultural University

基　　金：国家自然科学基金项目(30800680)

摘　　要：利用湖北武汉7月中旬至8月下旬期间自然高温环境,采用分蘖田间耐热性鉴定法对2份耐热品种Ⅱ优838、汕优63和2份敏感品种Ⅱ优63、特优559进行耐热性鉴定。结果表明:在花期均温达到最高的时间点"08-02",4份品种的分蘖结实率均达到最低值,但耐热品种Ⅱ优838和汕优63的结实率要远高于敏感品种Ⅱ优63和特优559;表明Ⅱ优838、汕优63的耐热性大大强于Ⅱ优63、特优559,与生产实践非常吻合。在另一个高温胁迫点"08-11"也得到了类似的结果。回归分析表明,在受到高温热害时所有供试品种的分蘖结实率与花期均温均存在极显著负相关,且对Ⅱ优63、特优559的结实率影响更为严重。High-temperature tolerance of two heat-tolerant rice cultivars（Ⅱ-you 838 and Shanyou 63） and two heat-sensitive rice cultivars（Ⅱ-you 63 and Teyou 559） was investigated by the HTTF（high-temperature tolerance identification of rice tiller under field conditions） method under natural high-temperature conditions between mid-July and late-August in Wuhan,Hubei Province.The results showed that the lowest seed setting rate（SSR） was observed at the hottest time point ＂2nd August＂,and SSR of Ⅱ-you 838 and Shanyou 63 was significantly higher than that of Ⅱ-you 63 and Teyou 559,suggesting that high-temperature tolerance of cultivars Ⅱ-you 838 and Shanyou 63 was superior to that of cultivars Ⅱ-you 63 and Teyou 559,coinciding well with the practical performance of those cultivars.Similar results were obtained at time point ＂11th August＂.The correlation and regression analysis showed that the SSR of tiller was negatively correlated with corresponding average temperature in flowering stage for all tested cultivars encountered by high-temperature stress,and the SSR of tiller of heat-sensitive cultivars Ⅱ-you 63 and Teyou 559 was much more lower compared to heat-resistant cultivars Ⅱ-you 838 and Shanyou 63.

关 键 词：耐热性 水稻 分蘖 结实率 花期均温 

分 类 号：S511.037[农业科学—作物学]