《植物生理学报》 2013, 49(8): 817-823
摘 要：以不同倍性小麦为材料, 研究水分胁迫对种子萌发、幼苗生长、贮藏物质转运以及萌发期生理生化指标的影响。结果表明, 二倍体小麦发芽能力显著低于四倍体和六倍体小麦, 但发芽速度较快; 随着染色体倍数的递增, 小麦根/芽比、贮藏物质转化效率、淀粉含量、种子萌发后期(第8天)可溶性糖含量均呈逐渐增加的趋势, 而贮藏物质转运率逐渐降低; –0.5 MPa水分胁迫对小麦幼苗的生长和生物量、种子贮藏物质的转运量和转运率、萌发后期α-淀粉酶活性的抑制程度均随着小麦染色体倍数的递增而逐渐降低。表明随着染色体倍数的递增, 小麦种子萌发和早期幼苗生长对水分胁迫的耐受性逐渐增强。
关键词：小麦; 种子萌发; 幼苗生长; 贮藏物质转运; 水分胁迫
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Abstract:In this study, the effects of water stress on seed germination, seedling growth, translocation of seed reserves and other physiological and biochemical indexes in wheat with different ploidy levels were investigat-ed at stages of seed germination and seedling growth. The results indicated that diploid wheat had a significant-ly higher germination speed but lower germinated capacity than tetraploid and hexaploid wheat. With the in-crease in ploidy, the root/shoot ratio, translocation efficiency of seed reserves, starch content, soluble sugar content at the latter stage of germination (eighth day) gradually and significantly increased, while translocation percentage of seed reserves decreased evidently. However, the degree of water stress inhibition (–0.5 MPa) to seedling growth, biomass, weight of utilized seed reserves, percentage of seed reserve translocation and α-amylase activity at the latter stage of germination gradually decreased with the increase in wheat ploidy. These results suggest that the tolerance of wheat to water stress during seed germination and seedling develop-ment gradually strengthen with the increase in ploidy.
Key words: wheat; seed germination; seedling growth; translocation of seed reserves; water stress
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