28份玉米自交系抗旱性鉴定

【目的】鉴定28份玉米自交系进行抗旱性,为广西抗旱玉米种质创新和抗旱玉米品种选育提供依据。【方法】在正常灌水和干旱胁迫处理下,测定穗长、穗粗、穗行数、行粒数和百粒重等果穗性状指标,同时测定产量指标。采用隶属函数法对果穗性状指标抗旱系数计算D值,采用产量指标计算抗旱指数,综合评价不同玉米自交系的抗旱性。【结果】D值0.318 6~0.985 7,其中抗旱性强的自交系12份,抗旱性中等的10份,抗旱性弱的6份;产量抗旱指数在0.387 7~1.458 3,其中为抗旱性强的自交系7份,抗旱性中等的10份,抗旱性弱的11份;2种评价结果之间相关性为0.7402,达到极显著正相关。【结论】产量抗旱指数与隶属函数法均可用于玉米自交系抗旱性评价,2方面评价结果均属于抗旱性强的自交系为D1101、Q901、VN、桂39722、YD2、D1113和SP221。

Drought Resistance Identification of 28 Maize Lines

【Objective】 To indentify the drought resistance of 28 maize inbred lines with a view to providing a basis for maize germplasm innovation and varieties breeding of drought resistant in Guangxi.【Method】 Under normal irrigation and drought stress, ear length, ear diameter, ear rows number, row kernels number and 100-kernels weight were measured, and yield index was also determined.Drought resistances of different maize inbred lines were evaluated by the D value of ear characters drought coefficient and the drought index of yield.【Result】 The D value obtained by subordinate function method ranged from 0.318,6 to 0.985,7, including 12 inbred lines with strong drought resistance, 10 with moderate drought resistance and 6 with weak drought resistance.Yield drought index ranged from 0.387,7 to 1.458,3, including 7 inbred lines with strong drought resistance, 10 with moderate drought resistance and 11 with weak drought resistance.The relationship between the two kinds of evaluation results was significantly correlated with a coefficient of 0.740,2.【Conclusion】 Both yield drought resistance index and subordinate function method can be used to evaluate drought resistance of maize inbred lines.Two aspects of the evaluation results show that D1101, Q901, VN, Gui39722, YD2, D1113 and SP221 were strong drought resistance inbred lines.