不同基因型冬小麦抗旱性鉴定及相关抗旱指标分析

Drought Resistance and Related Indexes Analysis of Different Genotypes Winter Wheat Cultivars

【目的】研究干旱胁迫对冬小麦形态指标的影响和不同材料间抗旱性的差异。【方法】采用田间干旱胁迫和室内模拟干旱辅助试验相结合的方法,在种子萌发期和生育中后期,对不同品系(种)相关指标进行研究分析。【结果】发芽率、发芽势、根数、芽鞘长和贮藏物质转运率的抗胁迫系数与种子抗旱性之间关系达显著或极显著水平,可以作为种子萌发期的鉴定指标;产量、株高、穗长和收获穗数与抗旱指数相关显著或极显著,可以作为田间抗旱性鉴定指标。种子萌发期鉴定指标与田间鉴定指标之间相关不显著,说明种子萌发期与生育后期抗旱性是独立的遗传性状。【结论】冬小麦抗旱性评价应对各生育时期鉴定指标的指示结果进行综合考虑。

【Objective】The project aimed to study the morphological indexes and difference of drought-resistance under drought-stress of winter wheat.【Method】Related indexes had been analyzed in the way of small area experiment connected with dry climate experiment in lab during the germination stage and in the field during middle-late growing period.【Result】There were extremely significant or significant correlation between the anti-stress indexes of the germination rate,germination energy,root number,colepptile length,rate of matter transport and drought-resistance,these indexes could be the indices to identify the drought resistance during the period of germination.Extremely significant or significantly correlation was also found between yield,height of plant,length of spike,number of spike and drought index,so these indexes could be the indices to identify the drought resistance during the period of middle-late growing period.There is no significant correlation between drought resistance at germination stage and middle-late phase,indicating that drought resistance at different stage is controlled by different genes or loci.【Conclusion】Each designation result of all stage should be considered respectively when estimating the drought resistance of winter wheat.