• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crop Science >Leaf Transpiration Efficiency of Some Drought-Resistant Maize Lines
【24h】

Leaf Transpiration Efficiency of Some Drought-Resistant Maize Lines

机译：一些抗旱玉米品种的叶片蒸腾效率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

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。） 中的叶片气体交换的现场测量通常表明气孔导度高于 提供饱和的 至光合作用。因此，玉米叶片的 蒸腾效率（TE）通常低于具有C 4 代谢的 物种可能达到的水平。我测试了几种描述为抗旱或耐旱的玉米系 是否具有较高的叶片TE值而不是干旱适应性较低的品系。在两个季节内对五个据说是玉米的 抗旱品系和三个不被认为是抗旱的本地种植的品系 进行了实地测量。 。在贝尔茨维尔的环境温度和湿度条件下，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 测量。医师土壤水分 没有限制。气孔导度，气孔下碳浓度，TE和气孔导度在 品系之间存在一致且显着的差异，而在 品系之间没有显着差异。光合作用。一条耐旱的 株系的TE值高于所有其他受测株系，而局部的 株系的TE最低，但耐旱的株系为 < / sup>组的TE没有明显升高。结论 玉米叶片TE存在明显的基因型变异， 并且可以在不降低光合作用的情况下提高TE。

著录项

  • 来源
    《Crop Science》 |2010年第4期|1409-1413|共5页
  • 作者

    James A. Bunce;

  • 作者单位

    Crop Systems and Global Change Laboratory, USDA-ARS, Beltsville Agricultural Research Center, 10300 Baltimore Avenue, Beltsville, MD 20705-2350;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号