UV-B滤减处理下烟草光合作用参数对光照度的响应

生态学杂志

UV-B滤减处理下烟草光合作用参数对光照度的响应

纪鹏¹;王毅²;陈宗瑜¹;钟楚¹;董陈文华¹

¹云南农业大学农学与生物技术学院，昆明 650201;²红塔集团技术中心，云南玉溪 653100

收稿日期:2008-10-28 修回日期:1900-01-01 出版日期:2009-07-10 发布日期:2009-07-10

Responses of tobacco leaf photosynthetic parameters to illuminance under attenuated UV-B radiation.

JI Peng¹;WANG Yi²;CHEN Zong-yu¹;ZHONG Chu¹;DONG Chen-wen-hua¹

¹College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China;²Technical Center of Hongta Group, Yuxi 653100, Yunnan, China

Received:2008-10-28 Revised:1900-01-01 Online:2009-07-10 Published:2009-07-10

摘要/Abstract

摘要： 以烟草栽培品种K326为材料，通过覆盖不同的透明薄膜滤减UV-B辐射，研究了100%（CK）、75%（T₁）、50% (T₂)、35%（T₃）UV-B辐射透过率处理下，烟草成熟初期光合参数与50和150 cm高度光照度的关系。结果表明：对于T₁、T₃，烟叶净光合速率的变化主要是气孔因素，而T₂主要是非气孔因素;通过对4类处理的平均水分利用效率的比较，发现可能存在一个UV-B辐射对水分利用效率影响的阈值范围;150 cm高度光照度除了对蒸腾速率和T₂处理的气孔导度起促进作用外，对其他光合参数都有一定的抑制作用;而不同处理的烟叶光合参数对50和150 cm高度上的光照度的响应都较为一致，在敏感程度上则存在差异。

关键词: 长江口, 浮游动物, 潮汐

Abstract: By the method of covering with different transparent plastic films to attenuate UV-B radiation, this paper studied the photosynthetic characteristics of tobacco cultivar K326 at its early maturity stage as affected by the illuminance at the heights 50 and 150 cm when the UV-B transmittance was 100% (CK), 75% (T1), 50% (T2), and 35% (T3). The change of tobacco leaf net photosynthetic rate in treatments T1 and T3 was mainly due to stomatal factor while in treatment T2 was mainly due to non-stomatal factors. Through the comparison of the average water use efficiency (WUE) in the four treatments, it was found that there could be a threshold of UV-B radiation intensity to WUE. The illuminance at height 150 cm had definite inhibitory effects on the photosynthetic parameters except the transpiration rate in all treatments and the stomatal conductance in treatment T2. For all treatments, the responses of tobacco leaf photosynthetic parameters to the illuminance at heights 50 cm and 150 cm were consistent but differed in sensitive degree.

Key words: Zooplankton, Changjiang Estuary, Tide

纪鹏;王毅;陈宗瑜;钟楚;董陈文华. UV-B滤减处理下烟草光合作用参数对光照度的响应[J]. 生态学杂志.

JI Peng¹;WANG Yi²;CHEN Zong-yu¹;ZHONG Chu¹;DONG Chen-wen-hua¹. Responses of tobacco leaf photosynthetic parameters to illuminance under attenuated UV-B radiation.[J]. cje.

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