Response to salinity in the homoploid hybrid species Helianthus paradoxus and its progenitors H-annuus and H-petiolaris
Response to salinity in the homoploid hybrid species Helianthus paradoxus and its progenitors H-annuus and H-petiolaris
复制标题
DOI：
10.1111/j.1469-8137.2006.01687.x
复制
发表时间：
2006-01-01
期刊：
影响因子：
9.4
通讯作者：
Rieseberg, L
中科院分区：
文献类型：
--
作者：
Karrenberg, S;Edelist, C;Rieseberg, L
为了更好地理解盐生二倍体杂交种向日葵（Helianthus paradoxus）及其糖生祖先向日葵（Helianthus annuus）和叶柄向日葵（Helianthus petiolaris）的盐响应，我们对每种的3个种群的植物进行了一个对照（非盐）和3个盐处理，其中一个盐处理模拟了向日葵生境中的离子组成。相对于对照，盐水处理导致H. paradoxus的生产力下降了19-33%，只有H. paradoxus，叶片中钾，钙，镁的含量大大降低。在所有处理下，H.与其祖先种相比，黑刺番荔枝具有更高的根资源分配能力，肉质性更好，叶片中钠（> 200 mmol l（-1）组织水）和硫含量更高，这些结果表明黑刺番荔枝的耐盐性和物种形成具有重要意义。paradoxus与钠替代钾、钙和镁作为液泡膜有关。可能涉及的进化和遗传机制进行了讨论。
To contribute to the understanding of ecological differentiation in speciation, we compared salinity responses of the halophytic diploid hybrid species Helianthus paradoxus and its glycophytic progenitors Helianthus annuus and Helianthus petiolaris.Plants of three populations of each species were subjected to a control (nonsaline) and three salinity treatments, including one simulating the ion composition in the habitat of H. paradoxus.Relative to the control, saline treatments led to a 17% biomass increase in H. paradoxus while its progenitors suffered 19-33% productivity reductions and only in H. paradoxus, leaf contents of potassium, calcium, and magnesium were strongly reduced. Under all treatments, H. paradoxus allocated more resources to roots, was more succulent, and had higher leaf contents of sodium (> 200 mmol l(-1) tissue water) and sulfur than its progenitor species.These results suggest that salt tolerance and thus speciation of H. paradoxus is related to sodium replacing potassium, calcium and magnesium as vacuolar osmotica. The evolutionary and genetic mechanisms likely to be involved are discussed.