对2010年3月2日～11日低温阴雨条件下19个甘蓝型油菜品种有效结角率、每角粒数、千粒重和种子含油量进行了分析.结果表明:(1)开花后低温阴雨导致油菜有效结角率下降(平均为对照的72.81％),每角粒数减少(是对照的57.32％),种子千粒重稍有增加(是对照的119.79％),含油量降低(是对照的95.31％).(2)开花时低温阴雨导致有效结角率下降(是对照的46.01％),每角粒数减少(是对照的33.11％),千粒重有所增加(是对照的114.67％),含油量降低(是对照的96.71％).(3)开花时低温阴雨对所有供试品种的有效结角率、每角粒数影响均大于开花后.(4)花期低温阴雨的影响因品种而异,希望98、中油821等7个品种抗耐性好.同一品种对开花期和开花后低温阴雨的抗耐性基本一致.%Yield factors and oil contents of 19 Brassica napus genotypes were investigated under continuous low temperature overcast and rainy weather ( CLTORW) from March 2 to March 11, 2010. Results were as below: ( 1) CLTORW after flowering, RES ( ratio of effectual silique) decreased and was 72. 81% of control, SPS ( seeds per silique) was 57. 32% and OC (oil content) was 95.31% of control, but WTS (thousand seeds weight) increased to 119.79% of control. (2) CLTORW during the flowering stage, RES decreased and was 46. 01% of control, SPS was 33.11% and OC was 96.71% of control, but WTS increased to 114.67% of control. (3) The effects of CLTORW on RES and SPS during flowering stage were much more severe than those of CLTORW after flowering stage. (4) Genotypes had different responses to CLTORW. Cluster analysis showed 7 varieties had higher tolerance , such as Xiwang 98 and Zhongyou 821. The cultivar had the same tolerance response to CLTORW both during and after flowering stages.
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