水分胁迫下紫花苜蓿和高粱种子萌发特性及幼苗耐旱性
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国家高新技术研究发展计划(863计划)资助项目(2006AA100202);中国科学院知识创新工程重要方向资助项目(KZCX3-SW-444 和 KSCX2-YW-N-003);国家教育部新世纪优秀人才支持计划资助项目


Seeds germination characteristics and drought-tolerance of alfalfa and sorghum seedling under water stress
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    摘要:

    利用PEG溶液(水势梯度:-0.1~-0.5MPa)模拟水分胁迫,研究了紫花苜蓿(品种:阿尔冈金和陇东)和高粱(品种:抗四)种子的萌发能力的变化及对萌发环境的最低水分需求,并进行种间差异比较。结果显示:PEG水分胁迫通过限制种子有效水分的吸收而抑制了其萌发,且随着胁迫强度的增加,萌发能力减弱,主要表现在: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。另一方面,种子群体萌动、萌发和出苗达50%概率时间随胁迫强度的增加而越发延迟,且各阶段对环境临界水势的需求不同,出苗阶段最为严格,说明种子出苗过程对环境水分胁迫最为敏感,耐旱能力最弱。相比之下,在同等胁迫条件下,高粱种子的萌发能力较苜蓿种子受到影响较小,各个阶段对环境水势的需求也相对较为宽松。因此,苜蓿苗期对干旱胁迫的忍耐能力不及高粱,且出苗过程中对环境水分条件的需求存在品种间差异。

    Abstract:

    To better understand the drought\|tolerance of alfalfa seedling, we investigated the seeds germination capability and the minimunm water requirment in alfalfa (cultivars: Long-Dong and Algonquin) and sorghum (cultivar: Kang-Si) under water stress mimicked by PEG-6000 solution (ψw=-0.1- -0.5 MPa). Simultaneously, the interspecific difference was obtained. The results showed that the inhibition of seed germination capability was dependent on impairing water efficient uptake under PEG stress, including declines of Germination Ratio, Water Content, Vigor Index and Germination Stress Index and increase of Radicle/Embryo Ratio and so on. Especially, germination capability was more weaked when water stress changed more severe. On the other hand, it must take more time to finish 50%seeds radical emergence, plumule emergence and seedling establishment than that of controls under water stress. The critical water potential at 50% alfalfa seedlings establishment stage was higher than those at 50% seeds radical emergence and plumule emergence stage. It indicated that the stage of seedling establishment was most sensitive to external water potential. Contrasting to alfalfa, the germination capability of sorghum was less affected under the same stress conditions above, and critical water requirments at all stages of germination were lower than those of alfalfa. Therefore, the enduring capability to water stress of alfalfa was weaker than sorghum, and the water requirment at seedling establishment stage was also different between two tested alfalfa cultivars.

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李文娆,张岁岐*,山仑.水分胁迫下紫花苜蓿和高粱种子萌发特性及幼苗耐旱性.生态学报,2009,29(6):3066~3074

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  • 收稿日期:2008-03-27
  • 最后修改日期:2008-11-13
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