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在人工模拟的不同水分胁迫条件下,对不同类型的四个冬小麦品种进行了种子萌发生理特性的比较。结果表明,在0—20大气压水分张力范围内,随着水分胁迫的加强,种子吸水率、萌发速度和成芽率降低,对成芽的伤害率增加,根、芽生长速度减慢,呼吸强度和淀粉酶活性减弱,游离氨基酸和脯氨酸含量增加,10大气压水分张力时达最高峰。随着水分胁迫的增强,品种间各生理指标的差异趋于显著。育成的抗旱品种和农家品种具有吸水和萌发速度快,成芽率高,根生长良好,呼吸强度和淀粉酶活性较高,游离氨基酸和脯氨酸含量较高等综合的抗旱性状。上述指标及其测定方法,对合理进行小麦生态区划、品种布局和抗旱育种有一定的参考价值。
Under different simulated water stress conditions, the physiological characteristics of four different winter wheat cultivars were compared. The results showed that under the condition of 0-20 atm tension, the water absorption rate, germination rate and percentage of germination decreased with the increase of water stress. The injury rate to buds increased, the growth rate of roots and buds decreased, and the respiration rate And amylase activity weakened, free amino acids and proline content increased, reaching the peak when the water pressure of 10 atm. With the increase of water stress, the difference of each physiological index tended to be significant. Drought-resistant cultivars and peasant cultivars have integrated drought-resistant traits such as high water and germination rate, high germination rate, good root growth, high respiration rate and amylase activity, higher free amino acids and proline content. The above indexes and their determination methods have certain reference value for rational wheat zoning, variety layout and drought resistance breeding.