杂交稻新组合天优3301光温生态特性分析

Photo-thermal characteristics of hybrid-rice,Tianyou 3301

采用温差、日长差的出穗日数对比和高温短日下出穗日数指标法,鉴定水稻光温特性。结果表明,天优3301感温性弱(1～2级)、感光性中偏低(4级)、基本营养生育期长(9级);天优3301在福建安全生长季种植,光敏期日长大多超过促进出穗临界日长,气温成为制约生育期的主要因素,当平均气温每升高1℃,营养生长期缩短4.4d,全生长期缩短8.4d;本田营养生长期日数和结实期日照是影响稻谷产量的重要生态因素。

Photo-thermal characteristics of the hybrid rice,Tianyou 3301,were studied.By comparing the number of days from sowing to heading under different temperatures and day-lengths,as well as an indexing method of using the number of days from sowing to heading under high-temperature-short-day-length conditions,the ecological characteristics of the rice were obtained.The results indicated that Tianyou 3301 had a weak temperature susceptibility（Grade 1-2）,medium photosensitivity（Grade 4） and long basic vegetative period（Grade 9）.When Tianyou 3301 was planted in safe growth season in Fujian,its photosensitive day-length generally exceeded the critical day-length for promoting heading,and temperature was a determining factor for its growth.When the average environmental temperature increased by 1℃,the vegetative growth stage was shortened by 4.4 d,and the growing season reduced by 8.4 d.The days of field vegetative growth stage and sun exposure during its ripening period were important ecological factors affecting the yield of the rice.