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首页> 外文期刊>Crop science >Leaf Transpiration Efficiency of Some Drought-Resistant Maize Lines
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Leaf Transpiration Efficiency of Some Drought-Resistant Maize Lines

机译：某些抗旱玉米品种的叶片蒸腾效率

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Field measurements of leaf gas exchange in maize (Zea mays L.) often indicate stomatal conductances higher than required to provide substomatal carbon dioxide concentrations saturating to photosynthesis. Thus maize leaves often operate at lower transpiration efficiency (TE) than potentially achievable for species with C4 metabolism. I tested whether several maize lines described as drought resistant or drought tolerant operated with higher leaf TE than less drought-adapted lines. Field measurements of leaf TE were conducted over two seasons for five reputedly drought-resistant lines of maize and three locally grown lines not regarded as drought resistant. Midday photosynthesis, transpiration, stomatal conductance, and substomatal carbon dioxide concentration measurements were made under the ambient field conditions of air temperature and humidity in Beltsville, MD. Soil moisture was not limiting. Consistent and significant differences among the lines occurred for stomatal conductance, substomatal carbon dioxide concentration, and TE, but no significant differences among the lines occurred in photosynthesis. One drought-tolerant line had higher TE than all others tested, and one of the local lines had the lowest TE, but the drought-tolerant lines as a group did not have significantly higher TE. It is concluded that significant genotypic variation in leaf TE exists in maize, and that TE could be improved without reducing photosynthesis.
机译：玉米（Zea mays L.）中叶片气体交换的现场测量通常表明，气孔导度高于提供饱和至光合作用的气孔二氧化碳浓度所需的气孔导度。因此，玉米叶的蒸腾效率（TE）通常低于具有C4代谢物种的潜在蒸腾效率。我测试了几种描述为抗旱或耐旱的玉米品系是否比不适应干旱的品系具有更高的叶片TE。在五个季节内对五个据说抗旱的玉米品种和三个不被认为具有抗旱性的本地种植品系进行了两个季节的叶片TE田间测量。在马里兰州贝尔茨维尔的空气温度和湿度的环境野外条件下，进行了午间光合作用，蒸腾作用，气孔导度和气孔下二氧化碳浓度的测量。土壤水分没有限制。气孔导度，气孔下二氧化碳浓度和TE在品系之间存在一致且显着的差异，但是在光合作用方面，品系之间没有显着差异。一个耐旱品系的TE高于所有测试的其他品系，而其中一个本地品系的TE最低，但作为一组的耐旱品系的TE则不明显更高。结论是玉米叶片TE存在明显的基因型变异，在不降低光合作用的情况下可以改善TE。

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