欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志 ›› 2005, Vol. ›› Issue (4): 390-394.

• 研究报告 • 上一篇    下一篇

模拟光条件下有性繁殖香根草光合生理的研究

刘金祥1, 李文送1,2, 刘家琼1   

  1. 1. 湛江师范学院热带草业科学研究所, 湛江, 524048;
    2. 湛江师范学院附属中学, 湛江, 524048
  • 收稿日期:2003-12-23 修回日期:2004-07-19 出版日期:2005-04-10
  • 通讯作者: 刘金祥
  • 基金资助:
    广东省“千百十”优秀人才基金(Q02113);湛江市科技攻关项目(2002101);湛江师范学院自然科学基金资助项目

Photosynthesis physiology of sexual reproductive Vetiveria zizanioides under simulated light source

LIU Jinxiang1, LI Wensong1,2, LIU Jiaqiong 1   

  1. 1. Institute of Tropical Patacultural Science, Zhanjiang Normal College, Zhanjiang 524048, China;
    2. Attached Middle School of Zhanjiang Normal College, Zhanjiang 524048, China
  • Received:2003-12-23 Revised:2004-07-19 Online:2005-04-10

摘要: 利用人工模拟光源研究了两种不同处理的(半水淹和对照)有性繁殖香根草的光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)和叶面饱和蒸气压亏缺(Vpdl)随模拟光辐射(SPR)的变化规律。结果表明,半水淹处理的Pn、Gs、Tr和WUE均比长势良好的对照处理高,这可能与淹水胁迫和香根草所处的物候期不同有关。有性繁殖香根草的光补偿点较低,而光饱和点较高,2600μmol·m-2·s-1SPR强度Pn还未达最大值。结合生长指标参数综合比较,两种处理的分值却相同。因此可以认为,有性繁殖香根草保持了亲本水陆两栖的特性,并具有强大的耐涝能力,适于河岸、水库、堤岸等潮湿地栽种.

关键词: 热带雨林, 濒危树种, 光抑制, 光适应, 保护酶系统, 可塑性

Abstract: Photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr),water use efficiency(WUE) and vapor pressure deficit at the leaf surface (Vpdl) of sexual reproductive Vetiver zizanioides were investigated under artificial simulated light source and different treatments (half-drown and normal treatment).The results showed that the plant under the normal treatment grew better than that under the half-drown,which had much higher Pn,Gs,Tr and WUE than the former.It might be caused by the different growth period and drown stress.The sexual reproductive V.zizanioides had a lower light compensation point,but a higher light saturation point,its Pn still did not reach the maximum when simulated photosyntyhetic radiation(SPR)had been 2 600 μmol·m-2·s-1.Compared comprehensively with combined growth parameters,the marks of two treatments were the same,which meant that sexual reproductive V.zizanioides maintained the amphibious characteristic of the parents which made it a euryhydric species and suitable to be planted at wetlands along river bank,reservoir and embankment.

Key words: Tropical rain forest, Endangered species, Photoinhibition, Photosynthetic acclimation, Antioxygenic enzymes, Flexibility

中图分类号: