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首页> 外文期刊>Journal of Experimental Botany >Exogenously-sourced ethylene increases stomatal conductance, photosynthesis, and growth under optimal and deficient nitrogen fertilization in mustard.
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Exogenously-sourced ethylene increases stomatal conductance, photosynthesis, and growth under optimal and deficient nitrogen fertilization in mustard.

机译：在芥菜中最佳和不足的氮肥施肥条件下，外源乙烯可增加气孔导度，光合作用和生长。

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摘要

In order to ascertain the stomatal and photosynthetic responses of mustard to ethylene under varying N availability, photosynthetic characteristics of mustard grown with optimal (80 mg N kg-1 soil) or low (40 mg N kg-1 soil) N were studied after the application of an ethylene-releasing compound, ethephon (2-chloroethyl phosphonic acid) at 40 days after sowing (DAS). The availability of N influenced ethylene evolution and affected stomatal conductance and photosynthesis. The effect of ethylene was smaller under deficient N where plants contained higher glucose (Glc) sensitivity, despite high ethylene evolution even in the absence of ethephon, potentially because the plants were less sensitive to ethylene per se. Ethephon application at each level of N increased ethylene and decreased Glc sensitivity, which increased photosynthesis via its effect on the photosynthetic machinery and effects on stomatal conductance. Plants grown with sufficient-N and treated with 200 micro l l-1 ethephon exhibited optimal ethylene, the greatest stomatal conductance and photosynthesis, and growth. These plants made maximum use of available N and exhibited the highest nitrogen-use efficiency (NUE).
机译：为了确定不同氮素供应条件下芥菜对乙烯的气孔和光合作用响应，在最佳（80 mg N kg -1 ）土壤或低（40 mg N kg 土壤）下生长的芥菜的光合特性在播种后40天（DAS）施用释放乙烯的化合物乙烯利（2-氯乙基膦酸）后，研究了> -1（supup）土壤）N。氮的有效性影响乙烯的进化，影响气孔导度和光合作用。在缺乏氮的情况下，乙烯的影响较小，尽管即使在没有乙烯利的情况下乙烯的释放量很高，植物仍具有较高的葡萄糖（Glc）敏感性，这可能是因为植物本身对乙烯的敏感性较低。在每个氮水平上施用乙烯利都会增加乙烯并降低Glc敏感性，这通过其对光合作用机制和气孔导度的影响而增加了光合作用。用足量氮肥和200μls -1 乙烯利处理的植物表现出最佳的乙烯，最大的气孔导度和光合作用以及生长。这些植物充分利用了可利用的氮，并表现出最高的氮利用效率（NUE）。

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