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首页> 外文期刊>Journal of Plant Physiology >Expression of terpenoid synthase mRNA and terpenoid content in salt stressed mangrove
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Expression of terpenoid synthase mRNA and terpenoid content in salt stressed mangrove

机译：盐胁迫红树林中萜类合酶mRNA和萜类化合物的表达

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摘要

The halophytic Kandelia candel and Bruguiera gymnorrhiza are ideal model for studying the molecular mechanisms of salinity tolerance in mangrove plants. The correlation between mRNA expression of four oxidosqualene cyclase (OSC) genes namely, KcMS multifunctional terpenoid synthase and KcCAS cyloartenol synthase (K. candel), BgbAS o-amyrin synthase and BgLUS lupeol synthase (B. gymnorrhiza) and salt concentration was examined. mRNA level of KcMS was increased with salt concentration in both roots and leaves of K. candel. Similarly, salt stress increased the mRNA levels of BgLUS and BgbAS in the root of B. gymnorrhiza. This result suggests that the function of terpenoids in root is associated with the salt stress. In contrast to these observations, the mRNA level of KcCAS was not modulated by salt stress in the roots, and decreased in the leaves. These results therefore suggest that the terpenoids but not phytosterols play an important role to cope with the salt stress in mangrove root. The content and proportion of o-amyrin and lupeol increased with salinity in the root of K. candel and B. gymnorrhiza, providing additional evidence for the protective role of terpenoids. However, o-amyrin and lupeol in B. gymnorrhiza leaves decreased with salt concentration, suggesting that the physiological significance for the terpenoids in the leaf may differ from that for the root.
机译：盐生的Kandelia candel和Bruguiera Gymnorrhiza是研究红树林植物耐盐性分子机制的理想模型。检查了四个氧化性角鲨烯环化酶（OSC）基因的mRNA表达，即KcMS多功能萜类合酶和KcCAS环戊烯醇合酶（K.candel），BgbAS邻氨基糊精合酶和BgLUS鲁贝醇合酶（B.gymrrhiza） KcMS的mRNA水平随盐浓度在K.candel的根和叶中增加。同样，盐胁迫增加了裸子叶杆菌根中BgLUS和BgbAS的mRNA水平。该结果表明，萜类化合物在根中的功能与盐胁迫有关。与这些观察结果相反，KcCAS的mRNA水平不受盐胁迫在根中的调节，而在叶中降低。因此，这些结果表明，萜烯而不是植物甾醇在应对红树林根系的盐胁迫中起着重要作用。盐碱度在坎氏油菜（K. candel）和裸枝油菜（B. Gymnorrhiza）的根中增加了o-amyrin和羽扇豆油的含量和比例，为萜类化合物的保护作用提供了进一步的证据。然而，裸露双歧杆菌叶片中的o-amyrin和羽扇豆酚随盐浓度降低而降低，表明叶片中萜类化合物的生理意义可能与根部有所不同。

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