广西地方稻种资源微核心种质的抗旱性鉴定评价

本研究利用全生育期旱胁迫方法，以穗颈粗、单株有效穗、千粒重、穗实粒数、总粒数、结实率与单株产量7个形态性状的综合抗旱D值为鉴定评价指标，对105份广西地方稻种资源的微核心种质进行了抗旱性鉴定评价。结果表明，在干旱胁迫下，单株产量与穗颈粗呈显著正相关，与其他5个形态性状呈极显著正相关。通过综合抗旱指数D值的鉴定评价，本研究获得了7个强抗旱型的地方栽培稻品种，占6.67%。广西的陆稻资源的综合抗旱力较强，可重点用于强抗旱种质材料的筛选。本研究为广西的抗旱育种提供了材料基础及理论依据。

Identification of drought resistance of landrace rice mini core germplasm in Guangxi

A total of 105 mini core collection of rice germplasm in Guangxi were indentified through treatment of whole growth period drought stress. D value was employed as the standard of evaluation, which was calculated according to panicle neck thick, effective panicles per plant, 1000-grain weight, filled grained per panicle, panicle density, seed setting rate, and grain weight per plant. The results showed that, under drought stress, grain weight per plant showed a significant positive correlation with panicle neck thick, and highly significant positive correlation with the other five morphological traits. By the evaluation of the comprehensive drought index D value, we obtained seven local-cultivated rice varieties with high drought resistance type (6.67%). Guangxi upland rice contains high percentage of high drought resistance resources, which can be used for germplasm screening. The identified germplasm is of significance for improvement of rice drought resistance.