...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dynamic Soil, Dynamic Plant >Plant Growth, Water Relations and Gas Exchange of Octoploid and Tetraploid Solatium villosum Mill. ssp. miniatum (Bernh. Ex Wild.) Edmonds under Water Deficit Conditions
【24h】

Plant Growth, Water Relations and Gas Exchange of Octoploid and Tetraploid Solatium villosum Mill. ssp. miniatum (Bernh. Ex Wild.) Edmonds under Water Deficit Conditions

机译：八倍体和四倍体茄皮绒毛磨的植物生长，水分关系和气体交换。 ssp。缺水条件下的埃德蒙兹小花（Bernh。Ex Wild。）

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Solanum villosum Mill. ssp. miniatum (Bernh. Ex Wild.) Edmonds is a leafy vegetable in Kenya, which has had limited genetic improvement. An octoploid line with larger stomata and leaves, and late flowering characteristics has been recently developed from the wild tetraploid. A study was conducted to evaluate the adaptive responses of this octoploid to water deficit in comparison to its wild tetraploid parent. Three pot experiments were carried out between January and August 2006 with the aim of quantifying plant responses to water deficit in terms of expansive processes, leaf area, plant dry matter production and partitioning, relative water content, stomatal conductance, transpiration and photosynthesis. There were no significant differences in theresponse to water deficit between the octoploid and tetraploid plants. Relative leaf expansion, relative leaf appearance and relative stem elongation rates began to decline at a fraction of available soil water (FASW) thresholds of 0.46-0.48, 0.34 and 0.47-0.51, respectively. Water deficit caused a 3-10-fold reduction in total plant leaf area and a 2-4-fold reduction in plant dry weight. The leaf relative water content of drought-stressed plants relative to the watered ones began to decline at a FASW of 0.27-0.32 while stomatal closure and consequently reduction in transpiration occurred when the FASW declined to below 0.41-0.57. Thus, reduction in expansive growth processes as well as in stomatal conductance occurred before reduction in relative water content suggesting presence of root signals. Stomatal closure caused relatively less reduction in photosynthesis rate as compared to transpiration rate, thereby increasing the water use efficiency. In conclusion, both the octoploid and tetraploid responded to water deficit mainly by reduction in leaf area and stomatal closure.
机译：茄茄。 ssp。 miniatum（Bernh。Ex Wild。）Edmonds是肯尼亚的一种带叶蔬菜，遗传改良有限。最近已经从野生四倍体中形成了具有较大的气孔和叶片的八倍体系，并且具有较晚的开花特性。进行了一项研究，以评估该八倍体与其野生四倍体亲本相比对缺水的适应性反应。在2006年1月至2006年8月之间进行了3个盆栽试验，目的是根据膨胀过程，叶面积，植物干物质的产生和分配，相对含水量，气孔导度，蒸腾作用和光合作用来量化植物对缺水的反应。在八倍体和四倍体植物之间对缺水的响应没有显着差异。在可用土壤水分阈值分别为0.46-0.48、0.34和0.47-0.51的情况下，相对叶片膨胀，相对叶片外观和相对茎伸长率开始下降。缺水导致植物总叶面积减少3-10倍，使植物干重减少2-4倍。 FASW为0.27-0.32时，干旱胁迫植物相对于浇水植物的叶片相对含水量开始下降，而当FASW降至0.41-0.57以下时，气孔关闭，蒸腾作用降低。因此，在相对水分含量降低之前，膨胀生长过程以及气孔导度的降低就出现了，表明存在根信号。与蒸腾速率相比，气孔关闭引起的光合作用降低相对较少，从而提高了水分利用效率。总之，八倍体和四倍体对缺水的反应主要是通过减少叶面积和气孔关闭。

著录项

相似文献

  • 外文文献
  • 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