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作者	单位
李晓云，赵勇，王杰，杨学芳，张树华，杨学举	(1.河北农业大学农学院，河北保定 071001； 2.河北农业大学生命科学学院，河北保定 071001； 3.河北省作物种质资源实验室，河北保定 071001)

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中文摘要:

为了鉴定并筛选耐低钾的小麦品系，以小麦(花培3号×豫麦57)双单倍体（DH）群体（168个株系）为材料，测定低钾处理和对照（正常钾处理）下，不同株系的地上部干重、地下部干重、整株干重、根冠比、根平均直径、根体积、根总表面积、总根长、根系活力、SOD活性、POD活性、钾浓度和钾累积量，分析其在低钾胁迫下的反应,综合评价不同品系的耐低钾性，筛选可用于评价耐低钾性的指标。结果表明，单一指标不能全面、准确地反映小麦的耐低钾性；通过主成分分析和隶属函数分析相结合的方法，获得各供试材料耐低钾性的综合评价值（D值），且D值可以直接反映各DH株系耐低钾能力的大小；通过逐步回归的方法建立了最优回归方程，筛选出6个与小麦耐低钾性显著相关的指标。

英文摘要:

To identify and screen wheat varieties (lines) resistanting to low potassium, 168 DH lines derived from a cross between Huapei 3 and Yumai 57 were used in this study. 13 indexes were investigated, including total dry weight, root dry weight, shoot dry weight, shoot dry weight/ root dry weight, root average diameter, total root volume, total root surface area, total root length, root activity, superoxide dismutase, peroxidase, total K⁺concentration and total K⁺accumulation, to analyze the reaction of different lines under low potassium stress, and to evaluate their resistance to low potassium and select the suitable indexes which can be used in evaluating the ability of resistance to low potassium. The results showed that the resistance of wheat to low potassium could not be comprehensively and accurately reflected by a single index. The comprehensive value (D value), basd on the method of principal component analysis and subordinate function, could directly demonstrate the capacity of resistance to low potassium of different DH lines. The best regression equation was established with the mathematical method of stepwise regression, and 6 indexes which significantly influenced the low potassium resistant of wheat were selected from the 13 indexes.

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