北疆主栽棉花种子对渗透胁迫的响应及其萌发力差异评价

Germination Response and Drought-resistance Evaluation of Cotton Seed to Osmotic Stress in Northern Xinjiang

以北疆棉区7个主栽的抗旱性有差异的棉花品种(品系)为材料,用PEG-6000渗透溶液模拟干旱胁迫研究棉花种子对水分胁迫的响应,并对各种子萌芽期的抗旱性做出评价。结果表明,随着胁迫浓度的提高,棉花种子的发芽率、发芽势和发芽指数下降,种子平均发芽时间延长;萌芽期棉花种子对水分胁迫十分敏感,10%的PEG-6000浓度下,棉花种子的发芽能力受到严重抑制;不同胁迫强度下,棉花种子的抗渗透萌发力并不一致;萌芽期棉花种子抗旱性鉴定的适宜PEG-6000浓度为5%,相对发芽率可作为快速、有效鉴定指标,新陆早33和益农2号的种子抗旱性较强,而新陆早24和新陆早31的种子抗旱性较差。

Seed germination responses and drought resistance estimation of 7 cotton with different drought resistance,which were widely planted in northern Xinjiang,to water stress were conducted through adopting PEG solution simulate soil drought treatment.The results showed that the germination rate,germination vigor and germination index were all decreased,and the average germination time were enlonged with PEG concentration increasing.Cotton seed were sensitive to water sress during germination process,and its germination ability were almost lost in 10% PEG.The drought resistance of the same cotton seed were not indentical to different water stress.Xinluzao No.33 and Yinong No.2 had better drought resistance,but the drought resistance of Xinluzao No.24 and Xinluzao No.31 was worse,this phenomenon suggested that the relative germination rate could be used as a rapid efficient index to evaluate the drought resistance of cotton at germination process.