C3和C4植物光能利用效率和水分利用效率的比较研究  

Comparison of light-use and water-use efficiency for C3 and C4 species

作　　者：叶子飘[1] 杨小龙[1] 康华靖[2] 

机构地区：[1]井冈山大学数理学院,江西吉安343009 [2]温州科技职业学院,浙江温州325006

出　　处：《浙江农业学报》2016年第11期1867-1873,共7页Acta Agriculturae Zhejiangensis

基　　金：国家自然科学基金(31560069);江西省自然科学基金(20142BAB20402)

摘　　要：了解C3和C4植物光能利用效率(LUE)和水分利用效率(WUE)对光的响应关系,对揭示植物的光能利用与需水规律具有重要意义。以栾树(Koelreuteria paniculata)、辣椒(Capsicum annuum)、高粱(Sorghum bicolor)和玉米(Zea mays)为研究对象,用LI-6400光合仪测量了这4种植物的气体交换参数,并利用光响应机理模型所构建的叶片光能和水分利用效率对光的响应模型分别研究了它们的光能和水分利用效率的变化规律。结果表明:(1)栾树和辣椒的最大光能利用效率(LUE_(max))和最大水分利用效率(WUE_(max))比高粱和玉米低,所对应的饱和光强(IL-sat)也小于高粱和玉米;(2)高粱的最大净光合速率(Pnmax)和饱和光强(Isat)均比玉米小,但它的LUE_(max)和WUE_(max)却比玉米大。由此可知,C3植物的栾树和辣椒LUE_(max)和WUE_(max)比C4植物的高粱和玉米低,而相应的饱和光强(I_(L-sat)和I_(W-sat))则没有这种趋势。This study aims to investigate the response relationship between light-use efficiency( LUE),water-use efficiency( WUE) and light intensity for C3 and C4 plants species. It is an important significance to reveal light-use and water consume of plants. We used LI-6400 Portable Photosynthetic System to measure the leaf gas exchange data of Koelreuteria paniculata,Capsicum annuum,Sorghum bicolor and Zea mays. Then these data were simulated by a light-response model of LUE and WUE which were developed by a mechanistic model of light-response of photosynthesis. These results showed that:( 1) the maximum light-use efficiency( LUE_(max)),maximum water-use efficiency( WUE_(max)) and the corresponding saturation irradiance( IL-satfor LUEmax) of K. paniculata and C. annuum were less than that of Z. mays and S. bicolor;( 2) the maximum net photosynthetic rate( Pn_(max)) and saturation irradiance( Isat for Pn_(max)) of S. bicolor were less than that of Z. mays,but its LUE_(max) and WUE_(max) were more than that of Z. mays.Therefore,LUE_(max) and WUE_(max) of K. paniculata and C. annuum for C3 plants are less than that of S. bicolor and Z.mays for C4 plants. However,there is no such tendency in their corresponding saturation irradiances( i. e. IL-satand IW-sat) for four plants.

关 键 词：C3植物 C4植物 光能利用效率 水分利用效率 

分 类 号：Q945.78[生物学—植物学]