摘要
为了探讨谷子出苗的外界环境最低水分需求和对干旱胁迫的忍耐能力,笔者利用PEG溶液(水势梯度为0^-0.50 Mpa)模拟干旱胁迫,研究了‘大同34号’谷子种子萌发能力的变化及对萌发环境的最低水分需求。结果表明,PEG干旱胁迫通过限制谷子种子有效水分的吸收而抑制其萌发,且随着渗透势的增大,萌发势减弱,主要表现为:累计萌发率、吸水速率、萌发活力、萌发胁迫指数等随胁迫强度的增加而下降,根芽比则随之增加。在-0.5 MPa PEG 6000溶液处理下,谷子萌发耐旱指数的差异性最显著,因此该浓度可作为谷子芽期耐旱性鉴定临界值。
In order to study the minimum water demand and the tolerance to drought stress of millet seedemergency,PEG solution（with water potential gradient of 0 to-0.50 MPa） was used in drought stresssimulation tests,the change of seed germination ability and the minimum water demand of‘Datong 34＇werestudied.The results showed that seed germination ability was inhibited through the restriction of availablewater assimilation,the germination potential decreased with the increase of osmotic potential,which weremainly shown as the accumulated germination rate,water absorption rate and germination stress indexdecreased with the increase of stress strength,while the radical bud ratio increased.Under the treatment of-0.5 MPa PEG 6000,the difference of drought tolerance index was the most significant,so this concentrationcould be used in the identification of drought tolerance of millet.
出处
《中国农学通报》
2016年第15期55-58,共4页
Chinese Agricultural Science Bulletin
基金
山西省大同市成果推广项目"优质谷子新品种大同34号繁育推广"(201449-1)
