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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Contrasting root traits and native regulation of aquaporin differentially determine the outcome of overexpressing a single aquaporin (OsPIP2;4) in two rice cultivars
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Contrasting root traits and native regulation of aquaporin differentially determine the outcome of overexpressing a single aquaporin (OsPIP2;4) in two rice cultivars

机译：对比的根性状和海底调节水分泌差异地确定两种水稻品种过表现出单一Aquaporin（OSPIP2; 4）的结果

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摘要

Overexpressing OsPIP2;4 in the two rice cultivars Giza178 and IR64 resulted in contrasting cultivar-dependent physiological attributes under control and drought conditions in the field. In the T3 plants, PIP2;4 expression was significantly higher in the leaves and roots of Giza178 under control but only in the roots under drought condition and higher in the leaves and roots of IR64 under control but not under drought condition compared with that in the corresponding wild types. The transgene improved the plant growth in Giza178 under both growth conditions but had no significant effect in IR64 under either condition. The transgenic lines of Giza178 recovered their leaf relative water content faster than those of the wild type in the afternoon and showed improved gas exchange parameters, water use efficiency, and grain yield, as a result of improved root hydraulic conductivity (Lp(r)) and xylem sap flow. No comparable responses were found in IR64 although Lp(r) and xylem sap flow were enhanced in the transgenic lines under the control condition only, suggesting that the positive effect of PIP2;4 on the well-watered leaves of IR64 was offset by the low root/shoot ratio and the inherent expression of other aquaporins. In the transgenic plants of IR64 under drought, PIP2;4 expression was not induced in the roots presumably due to an overriding post-transcription regulatory mechanisms, leading to the lack of changes in the Lp(r) and xylem sap flow and consequently, the plant growth, water relations, gas exchange, and grain yield were similar to the wild type. The data suggest that the outcome of overexpressing a single aquaporin gene depends on the plant architecture, internal responses to drought, and native expression of other aquaporins.
机译：过表达OSPIP2; 4在两种水稻品种GIZA178和IR64中导致在该领域的控制和干旱条件下形成鲜明对比的生理学属性。在T3植物中，PIP2;在对照中的叶子和胶扎178的叶子和根中，4表达显着较高，但只有在干旱病症下的根部，在叶片和叶片的叶片和叶片中的叶片和较高的控制中，而且没有在干旱条件下与其进行相应的野生类型。转基因在两种生长条件下改善了Giza178的植物生长，但在任何一个条件下，IR64都没有显着影响。由于改善的根液压导电性（LP（R））和木瓜sap流。在IR64中没有发现可比较的反应，尽管仅在对照条件下的转基因素中增强了LP（R）和木质SAP流动，表明PIP2的正效应; 4在IR64的良好浇水的叶片上偏离根/芽比和其他水蛋白的固有表达。在Drouground的IR64的转基因植物中，PIP2; 4表达在根中未诱导，可能是由于转录后调节机制覆盖，导致LP（r）和木质液缺失缺乏变化，因此植物生长，水关系，煤气交换和谷物产量与野生型相似。该数据表明，过表达单个Aquaporin基因的结果取决于植物建筑，对干旱的内部反应以及其他水蛋白的本地表达。

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