【摘要】 以云南 16个地州和 5个稻作区为单位 ,在低速磷胁迫和适速磷两种条件下 ,对 5 4 5份云南稻种核心种质的抽穗期研究结果表明 :不同稻种抽穗期受低速磷胁迫的影响差异较大 ,大部分稻种在低速磷胁迫下其抽穗期比适速磷条件下的延迟 ,但延迟天数明显低于不同稻种基因型差异 ;不同稻作区、地州的稻种抽穗期差异较大 ,这主要是与其生长的生态环境长期适应的结果。除了滇西北高寒粳稻区外 ,其他四个稻作区的核心种质在两种条件下的抽穗期有极显著差异 ,而各地州的核心种质在低速磷胁迫下的抽穗期存在显著差异的只有 5个地州 ,即昭通、思茅、临沧、保山和西双版纳 ,其余地州间的差异不明显。更多还原

【Abstract】 Under low and suitable phosphorus, 545 accessions of the core collection of Yunnan rice landraces were studied for the heading date. The results showed that there was comparatively significant difference between the different degrees of stress for low phosphorus. The heading date of most rice accessions under low phosphorus condition was later than that under suitable phosphorus condition. (2) There was great difference in the heading date of rice core collection in different rice cropping regions or prefectures because of the long history of adaptetion . (3) Among 5 rice cropping region except the northwest cold japonica region, the difference of their heading date was extremely significant. Under two stress conditions mentioned above, but there were difference only in five prefectures under low phosphorus condition.更多还原