西藏春播半冬性甘蓝型油菜光温特性的因子分析

Factor analysis on light and temperature characteristics of spring- sowing semi- winter rapeseed in Tibet

为西藏高寒春油菜生产区的育种和引种提供光温特性方面的理论参考,采用因子分析方法,分析了18个半冬性甘蓝型油菜品种的营养生长期、蕾花期和角果成熟期的光温因子,评价半冬性甘蓝型油菜在西藏春播条件下的光温特性。结果表明:3个公因子(营养生长期光温因子、蕾花期光温因子、角果期光温因子)对变异的方差累计贡献率达100%,能真实反映9个光温指标及其相互关系。全生育期中,营养生长期光温因子对半冬性甘蓝型油菜生长影响较大,其次是蕾花期。与西藏相邻地域品种表现光温钝感,反之表现光温敏感。t检验结果表明,光温敏感型油菜品种表现较强势的营养个体和较长的生育期,而产量性状差异不显著。说明在西藏春播区选择光温钝感型半冬性甘蓝型油菜品种能够兼顾早熟和高产的育种目标。

To understand light- temperature characteristics for introduced spring- sowing rapeseeds in Tibet,factor analysis was applied on 18 semi- winter rapeseed（ Brassica napus L.） cultivars from the southern and eastern China. Results showed that the accumulated variance contribution rate of 3 common factors（ light- temperature factors at vegetative stage,budding and flowering periods,silique stage） accounted for 100%,reflecting total 9light- temperature indicators and their relationships. During the whole growth period,the most influenced period by light- temperature was nutritional period,followed by budding and flowering stages. Cultivars from regions adjacent to Tibet were light- temperature insensitive,the others were light- temperature sensitive. t test showed stronger vegetative growth and longer growth period of sensitive cultivars. But no significant yield difference was found.It could be concluded that in Tibet spring- sowing area,the semi- winter rapeseed insensitive to light- temperature could be used for breeding the high- yield and early- mature variety.