不同玉米自交系萌芽期的抗旱性研究

以聚乙二醇(PEG)-6000作为渗透剂模拟水分胁迫,胁迫溶液渗透势范围在-0.3～-0.7 MPa,分析进行玉米种子水分胁迫萌发试验的条件;以种子萌发抗旱指数为依据对97份玉米自交系进行萌芽期抗旱性鉴定。结果表明,-0.5 MPa(PEG)-6000处理可以作为玉米萌芽期抗旱性鉴定的水分胁迫条件;在相同剂量的PEG-6000胁迫溶液下,相关分析显示,千粒重与相对发芽率呈显著负相关,与活力抗旱指数呈极显著负相关,与萌发抗旱指数未呈显著性相关。

Drought Resistance of Different Maize Inbred Lines in Germination Stage

Using polyethylene glycol (PEG)-6000 with osmotic potential from -0.3 to -0.7 MPa for simulating water stress, the osmotica concentration for evaluation of drought resistance in maize was researched. The drought resistance of 97 maize inbred lines was evaluated according to germination drought resistance index. The results showed that -0.5 MPa(PEG)-6000 stress was proper condition for the evaluation of drought resistance at germination period in maize. There existed inbred lines with different types of drought resistance, which were the important germplasms for drought resistant breeding in China. Results of correlation analysis indicated that 1 000-grain weight negatively and significantly correlated with relative germination rate, the vigor index of drought resistance had extremely significant negative correlation with 1 000-grain weight, and the germination drought resistance index hadn't significant correlation with 1 000-grain weight under the same dosage of PEG-6000 osmotic stress solutions.