关键词: 耐冷性状, 生态差异, 核心种质, 地方品种

Abstract: Some cold tolerance traits at the booting stage were evaluated based on 548 accessions core collection of rice landrace in Yunnan under natural low temperature (18℃, cold damage) and greenhouse (23℃). All the morphological traits of core collection were closely related to cold tolerance traits at the booting stage under cold damage conditions, with higher significant correlation coefficients(≥0.549 ** ) between seed setting rate and eight cold tolerance index traits including filled grain number per panicle, peduncle length, unfilled grain number per panicle, length of the node under panicle, anther length, anther volume, and first to second node length. On the contrary, there were only significant correlation (r>0.6) between seed setting rate and filled grain number per panicle, unfilled grain number per panicle, and low correlation (≤0.292 ** ) between other traits and seed setting rate under greenhouse. There was a similar changing trend among five rice ecological regions based on five cold tolerance index traits, i.e. filled grain number per panicle, anther volume, length of the node under panicle, peduncle length and first to second node length. For 16 prefectures or cities in Yunnan, these differences were closely associated not only with plant height, length of the node under panicle, peduncle length and first to second node length, but also with the climate and ecological difference.On the contrary, there was no relationship in cold tolerance traits among rice ecological regions or prefectures under greenhouse conditions except for filled grain number per panicle and unfilled grain number per panicle.

Key words: cold tolerance traits, ecological difference, core collection, rice landrace, booting stage