【摘要】 为研究谷子孕穗期在干旱环境的形态、生理、生化性状变化趋势,筛选谷子孕穗期抗旱性鉴定指标,以20个谷子品种为试验材料,在模拟干旱棚中分析了谷子孕穗期干旱胁迫条件下形态和生理、生化指标的变化。试验表明:单穗重、单穗粒重、株高、穗下茎长、千粒重与抗旱指数的相关性显著,可作为孕穗期抗旱性的形态指标;叶绿素含量、可溶性糖、丙二醛含量和超氧化岐化酶活性(SOD)4个指标与抗旱指数的相关性显著,可作为孕穗期的生理、生化指标。通过主成分分析确立了千粒重、单穗重、叶绿素和SOD等4个指标的相对值为谷子孕穗期抗旱性综合指标,以抗旱指数为因变量,4个综合指数为自变量建立的回归方程对供试品种的抗旱性进行预测具有高的准确性。更多还原

【Abstract】 Foxtail millet(Setaria italica(L.)Beauv.)may suffer from serious drought stress during growth period,which affects its morphological characteristics and physiological metabolic activities.Previous studies identified that booting stage before heading is the most sensitive period to water shortage in foxtail millet development,but no detail study on the response to drought stress was reported in both morphological and physiological traits.In this study,the morphological and physiological characteristics correlated with drought resistance index were monitored under both normal and drought stress conditions during booting stage using 20 foxtail millet cultivars.The results showed that relative panicle weight,grain weight per panicle,plant height,length of rachis,and thousand-grain-weight were significantly correlated with DRI under drought condition,which could be used as the morphological index to test drought resistance.Relative chlorophyll,soluble protein,malondialdehyde,and superoxide dismutase were significantly correlated with DRI under drought condition,which could be used as the physiological index to identify drought resistance in foxtail millet.Integrated drought resistance indexs including the relative TGW,panicle weight,chlorophyll,and contents were selected by principal components analysis.The drought resistance performances of foxtail millet varieties in field conditions confirmed the efficiency to predict the drought resistance during booting stage in foxtail millet using the integrated identification index and the recursive equation established in this study.更多还原