You Position: Home > Paper
Effects of enhanced ultraviolet-B radiation on growth, photosynthesis and respiration of Cucumis sativus leaves on different positions
( views:164, downloads:8 )
- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF APPLIED & ENVIRONMENTAL BIOLOGY
- Issue:
- 4
- DOI:
- 10.3321/j.issn:1006-687X.2001.04.004
- Key Word:
- UV-B辐射;黄瓜;光合作用;呼吸作用;生长
Abstract： 在植物生长室中,黄瓜植株第1片真叶出现后,用人工UV-B光源照射60d,测定植物各叶位叶片的生长和生理活动.结果表明,UV-B辐射条件下,植物出叶时间被延迟;叶面积和叶干重下降,降幅与叶位高低正相关;叶片含水量降低,老龄叶片(第1叶,下位叶)和幼龄叶片(第5叶,上位叶)的水分降幅均高于成年叶片(第3叶,中位叶);叶片的伸展速度、叶片数目以及单叶面积减少,致使黄瓜总叶面积下降;植株节间长度缩短,是植株矮化的重要原因;根、茎、叶等器官之间的相关生长变化不大,叶片生长在其中起重要的协调作用.UV-B降低Pn和EAQE,对光合作用的抑制程度随叶位升高而增加.UV-B辐射后,黄瓜叶片的光呼吸显著提高,增幅与叶片发育阶段有关.UV-B对黄瓜第1叶的暗呼吸没有影响,第2、3叶略微下降,第4叶显著升高.分析认为,植株矮化和叶面积减少有利于植物适应UV-B辐射;水分含量和光合作用减少、呼吸作用增强是黄瓜生长受抑制的生理基础.图2表2参18
- [1]G. Deckmyn,I. Impens.Seasonal responses of six Poaceae to differential levels of solar UV-B radiation[J].1999,41(2).
- [2]J B, Kerr,C T, McElroy.Evidence for large upward trends of ultraviolet-B radiation linked to ozone depletion.[J].1993,262(5136).
- [3]G. Deckmyn,I. Impens.The ratio UV-B/photosynthetically active radiation (PAR) determines the sensitivity of rye to increased UV-B radiation[J].1997,37(1).
- [4]T.A. Day,S.M. Demchik.Ultraviolet-B radiation screening effectiveness of reproductive organs in Hesperis Matronalis[J].1996,36(4).
- [5]Isabel Santos,J.M. Almeida,R. Salema.Plants of Zea mays L. Developed under Enhanced UV-B Radiation. I. Some Ultrastructural and Biochemical Aspects[J].1993,141(4).
- [6]高守疆,陈升枢,李明启.断光后的急骤耗氧现象及其与光呼吸的关系（英文）[J].1988,(4).
- [7]Ronald Robberecht,Martyn M. Caldwell,W. D. Billings.Leaf Ultraviolet Optical Properties Along a Latitudinal Gradient in the Arctic-Alpine Life Zone[J].1980,61(3).
- [8]Brown Martin J.,Parker Geoffrey G.,Posner Nathaniel E..A Survey of Ultraviolet-B Radiation in Forests[J].1994.
- [9]A.W.D.Larkum,W.F.Wood.The effect of UV-B radiation on photosynthesis and respiration of phytoplankton, benthic macroalgae and seagrasses[J].1993,36(1).
- [10]Deckmyn, G.,Martens, C.,Impens, I..The importance of the ratio UV-B/photosynthetic active radiation (PAR) during leaf development as determining factor of plant sensitivity to increased UV-B irradiance: effects on growth, gas exchange and pigmentation of bean plants (Phaseolus vulgaris ...[J].1994,17(3).
- [11]Li Yuan,Yue Ming,Wang Xun-Ling,etc.Competition and sensitivity of wheat and wild oat exposed to enhanced UV-B radiation at different densities under field conditions[J].1999,41(1).