不同基因型早籼稻气冠温差的差异及其与产量的关系

本研究旨在明确不同基因型早籼稻气冠温差的差异及其与产量的关系,为快速筛选优异种质资源和合理的栽培调控提供理论支持。选用36个早籼稻品种及主要的恢复系作为试验材料,利用红外测温仪,在相同的施肥和灌水条件下,监测不同品种孕穗期、抽穗期和乳熟期的冠层温度,并分析其与产量及其构成因子的关系。结果表明:气冠温差一直为正值,抽穗期不同基因型早稻白天气冠温差与气穗温差呈极显著正相关。早稻产量与孕穗期和抽穗期白天气冠温差均呈显著正相关,与孕穗期和抽穗期夜间气冠温差均呈负相关,其中在抽穗期达到显著水平。抽穗期气穗温差与产量呈显著正相关。产量构成因子与气冠温差的相关性均未达到显著水平。通过对参试品种3个生育期的气冠温差进行聚类分析,可以将其分为高温型、中温型和低温型水稻3种温度类型。

Genetic Differences in Canopy Temperature Depression Among Different Early-rice Varieties and Its Relationship with Yield

The objective of this study is to investigate the genotypic variation in canopy temperature depression (CTD) among different early-season indica rice cultivars in order to support rapid differentiating of superior germplasm and cultivation regulation. 36 genotypes of early-season indica rice and major restorer lines were selected as materials. They were grown under the same condition of fertilization and irrigation, and their canopy temperature was monitored at booting, heading, and milky-maturity stages using an infrared thermometer. The relationship between canopy temperature and yield and yield components was examined. The results showed that the daytime CTD was generally positive, and was significantly and positively associated with the panicle temperature depression at heading. Rice yield showed a significantly positive correlation with the daytime CTD at booting and heading stages, but had a negative correlation with the nighttime CTD at booting and heading stages with statistical significance at heading. The correlation between yield and panicle temperature depression at the heading stage was significantly positive. Yield components and CTD had no significant correlation. Using cluster analyses for the CTD at booting, heading, and milky-maturity stages, the tested rice materials can be divided into three temperature groups: high, medium, and low temperature types,.