藜种子异型性的变异及盐胁迫对后代的影响。
Variation of seed heteromorphism in Chenopodium album and the effect of salinity stress on the descendants.
机构信息
Xinjiang Key Laboratory of Biological Resources and Genetic Engineering, College of Life Science and Technology, Xinjiang University, Urumqi, China.
出版信息
Ann Bot. 2010 Jun;105(6):1015-25. doi: 10.1093/aob/mcq060.
BACKGROUND AND AIMS
Chenopodium album is well-known as a serious weed and is a salt-tolerant species inhabiting semi-arid and light-saline environments in Xinjiang, China. It produces large amounts of heteromorphic (black and brown) seeds. The primary aims of the present study were to compare the germination characteristics of heteromorphic seeds, the diversity of plant growth and seed proliferation pattern of the resulting plants, and the correlation between NaCl stress and variation of seed heteromorphism.
METHODS
The phenotypic characters of heteromorphic seeds, e.g. seed morphology, seed mass and total seed protein were determined. The effects of dry storage at room temperature on dormancy behaviour, the germination response of seeds to salinity stress, and the effect of salinity on growth and seed proliferation with plants derived from different seed types were investigated.
KEY RESULTS
Black and brown seeds differed in seed morphology, mass, total seed protein, dormancy behaviour and salinity tolerance. Brown seeds were large, non-dormant and more salt tolerant, and could germinate rapidly to a high percentage in a wider range of environments; black seeds were salt-sensitive, and a large proportion of seeds were dormant. These characteristics varied between two populations. There was little difference in growth characteristics and seed output of plants produced from the two seed morphs except when plants were subjected to high salinity stress. Plants that suffered higher salinity stress produced more brown (salt-tolerant) seeds.
CONCLUSIONS
The two seed morphs of C. album exhibited distinct diversity in germination characteristics. There was a significant difference in plant development and seed proliferation pattern from the two types of seeds only when the parent plants were treated with high salinity. In addition, seed heteromorphism of C. album varied between the two populations, and such variation may be attributed, at least in part, to the salinity.
背景和目的
藜是一种著名的恶性杂草，在中国新疆的半干旱和低盐环境中作为耐盐物种而存在。它会产生大量异型（黑色和棕色）种子。本研究的主要目的是比较异型种子的萌发特性、植物生长和种子繁殖模式的多样性，以及 NaCl 胁迫与种子异型性变化之间的相关性。
方法
测定了异型种子的表型特征，如种子形态、种子质量和总种子蛋白。研究了在室温下干藏对休眠行为的影响、种子对盐胁迫的萌发响应，以及不同种子类型的植物在盐胁迫下生长和种子繁殖的影响。
主要结果
黑、棕色种子在种子形态、质量、总种子蛋白、休眠行为和耐盐性方面存在差异。棕色种子较大、不休眠且更耐盐，可以在更广泛的环境中快速萌发至较高比例；黑色种子对盐敏感，且大量种子休眠。这两个特征在两个种群之间存在差异。除了在高盐胁迫下，两种种子形态的植物在生长特征和种子产量方面几乎没有差异。遭受较高盐胁迫的植物会产生更多的棕色（耐盐）种子。
结论
藜的两种异型种子在萌发特性方面表现出明显的多样性。只有当亲代植物受到高盐胁迫时，两种类型的种子在植物发育和种子繁殖模式上才会出现显著差异。此外，藜的种子异型性在两个种群之间存在差异，这种变异至少部分归因于盐度。
Zotero 插件