欢迎访问林业科学,今天是

林业科学 ›› 1997, Vol. 33 ›› Issue (1): 18-24.

• 论文及研究报告 • 上一篇    下一篇

沙拐枣同化枝的光合作用和呼吸作用对生长季节、光照强度、高温和干旱的响应

王邦锡,王辉,黄久常   

  1. 兰州大学植物生理研究室 兰州 730000
  • 收稿日期:1995-07-04 出版日期:1997-01-25 发布日期:1997-01-25
  • 基金资助:
    国家自然科学基金

RESPONSES OF PHOTOSYNTHESIS AND RESPIRATION ON GROWTH SEASON, LIGHT INTENSITY, HIGHER TEMPERATURE AND DROUGHT IN ASSIMILATIVE SHOOT OF CALLIGONUM ARBORESCENS LITY

Bangxi Wang,Hui Wang,Jiuchang Huang   

  1. Laboratory of plant physiology, Lanzhou University Lanzhou 730000
  • Received:1995-07-04 Online:1997-01-25 Published:1997-01-25

摘要:

沙拐枣同化枝的Pn随光照强度增加递增并具有高的LSP。夏季的PnPtLSP高于秋季,而LCPR和饱和光照下的CO2CP低于秋季。表明沙拐枣是阳地生态型植物, 9月的同化枝已开始衰老。在饱和光照下, Pn随处理温度上升明显下降,相反R升高,但Pt在夏季和秋季均只有轻度变化。说明Pn下降是由R升高的致。在干旱影响下,同化枝的水势随干旱时间延长递降, PnRRpPtLSPLCP和Chl含量均呈现同样变化,饱和光照下的CO2CP则明显升高,在12天干旱后水势下降至-1.86MPa时, Pt仍能保持58.5%,将干旱和高温结合处理沙拐枣柏株,结果与干旱处理相似,但受等程度加重, Pt仍能保持对照的41.5%。这些结果表明,沙拐枣除形态结构适应外,生理功能对强光、高温和干旱的荒漠环境也有广泛的适应能力。

关键词: 光合作用, 呼吸作用, 温度, 干旱, 沙拐枣

Abstract:

Net photosynthesis in assimilative shoot of C.arborescens Litv. rised gradually following with the increase on light intensity and light saturation point was higher. Net and ture photosynthesis and light saturation point were higher in summer than autumn. The results showed that C.arborescens Litv. is a sun ecotype plant and its assimilative shoot started decline in September.Net photosynthesis was significently decreased following with the gradual rising of temperature under saturation light, On the contrary, respiration tised, but changes of ture photosynthesis where little in those two seasons. These indicated that the decline of net photosynthesis was induced by the rising of respiration.there were many effects of drought on photosynthesis in a ssimilrtive shoot of C.arborescens Lity. Water potential declied gradually with the increase of treatment time. The change inclination of net photosynthesis, ture photosynthesis, respiration, photorespiration, light saturation point, light compensation point and chlorophyll content were similar to that of water pocential. Contrarily, Co2 compensstion point was significently rised at saturation light, but, net photosynthesis can keep 58. 5% yet after 12 days.The plant was treated by the combination of drought and temperature. The change tendency of all aspects were similar to the effects of drought. though, the degree of damage was greater, however, the ture photosynthesis is yet. kept 41. 5%. It showed that except morphological constitution, physiological founction of the desert plant has wider adaptability to strong light, hight temperature and drought of environment.

Key words: Photosynthesis Respiration, Temperature, Drought, Calligorum Arborescens Litv,