Inherited maternal effects on the drought tolerance of a natural hybrid aquatic plant, Potamogeton anguillanus
Inherited maternal effects on the drought tolerance of a natural hybrid aquatic plant, Potamogeton anguillanus
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DOI：
10.1007/s10265-007-0087-y
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发表时间：
2007-07-01
影响因子：
2.8
通讯作者：
Kosuge, Keiko
中科院分区：
文献类型：
--
作者：
Iida, Satoko;Yamada, Ayumi;Kosuge, Keiko
我们测试了母体效应是否导致了适应性分歧的菌株的自然杂交眼子菜anguillanus，其假定的父母表现出对比不同的生态。为了研究表型性状和母体类型之间的相关性，我们进行了干旱实验和DNA分型使用核和叶绿体基因。在现场，我们调查了母体类型沿着深度和近岸-离岸梯度的分布。在淹水条件下，马来山杨母本与串叶山杨母本的杂种（M-杂种）在形态上不能区分，但在耐旱性上存在差异。在干旱条件下，M-杂种和马来杨比P-杂种和串叶杨形成更多的地上枝，并表现出更高的存活率。分布调查澄清，M-杂种优势，在浅水区和近海地区，而他们几乎没有在较深的和近海地区。这些结果表明，天然杂交鳗的适应值取决于母体类型。双向杂交和可遗传的母体效应可能在其表型适应当地环境条件中发挥了重要作用。
We tested whether maternal effects have led to the adaptive divergence of strains of the natural hybrid Potamogeton anguillanus, whose putative parents show contrastingly divergent ecologies. To examine the correlation between phenotypic characters and maternal types, we conducted drought experiments and DNA typing using nuclear and chloroplast genes. In the field, we investigated the distribution of the maternal type along the depth and the inshore-offshore gradient. Hybrids of P. malaianus mothers (M-hybrids) and those of P. perfoliatus mothers (P-hybrids) could not be distinguished morphologically under submerged conditions, but differed in drought tolerance. M-hybrids and P. malaianus formed more terrestrial shoots and exhibited higher survival than P-hybrids and P. perfoliatus in drought experiments. The distribution survey clarified that M-hybrids were dominant in shallow and inshore areas, whereas they were almost absent in deeper and offshore areas. These results indicate that the natural hybrid P. anguillanus differs in adaptive values depending on the maternal type. Bidirectional hybridization and heritable maternal effects may have played important roles in its phenotypic adaptation to local environmental conditions.