红蓝单色光质下茄子叶片的光吸收与光合光响应特性  

Light absorption and response characteristics of photosynthetic available radiation on photosynthesis of eggplant leaves under monocolour light quality

作　　者：杜爽[1] 高志奎[1] 薛占军[1] 高玉[1] 

机构地区：[1]河北农业大学园艺学院,河北保定071001

出　　处：《河北农业大学学报》2009年第1期19-22,29,共5页Journal of Hebei Agricultural University

基　　金：国家自然科学基金(30571267);河北省"十一五"科技支撑计划项目(07220701D)

摘　　要：以日光温室茄子‘黑帅圆茄’为试材，测试了高亮型发光二极管LED光源发出的白光（400～700nm）和单色光质[红光（650±5）nm、蓝光（470±5）nm]下叶片和叶绿素的光吸收，以及光合对光强响应特性参数的影响，分析了红、蓝单色光质的光合效率。通过分光光度计在400～700nm波长范围内扫描表明，叶绿素对强吸收波长400～480nm和650～680nm范围内的红光（660nm）和蓝光（470nm）的吸光值较高，白光（400～700nm）较低。通过积分球采用LED光源测得红光下茄子叶片的光吸收系数ε最高，其次为白光，蓝光最低。在白光和红、蓝单色LED光源下，光饱和点LSP无明显差异，在1800～2000μmol／（m^2·S）之间；但是，蓝光的表观光量子效率AQY、实际光量子效率PQY、最大净光合速率Pnmax和最大光合光转化效率LCEmax均比红光的低；蓝光的光补偿点LCP、光半饱和点LSPsemi比红光的高，白光居中。综合反映出蓝光的光合效率低于红光，其原因主要与蓝光的光吸收系数ε低于红光有关。This paper studies the light absorption of leaves and chlorophyll and response characteristics of Pn/PAR with white light （400 - 700 nm） and mono-color light quality [red light （650 ± 5） nm, blue light （470± 5）nm], and analyses the photosynthetic efficiency of red light and blue on eggplant （Solanum melongena L. ）‘HEISHUAI＇ which adapted in greenhouse. The absorption value red light （660 nm） and blue light （470 nm） of chlorophyll in the scope of strong wavelength 400 - 480 nm and 650 - 680 nm are higher, the absorption value of white light （400 - 700 nm） are lower, the leaf＇s absorption coefficient εof red light through the LED light source measured by the integral ball is higher than that of white light, and the ε of blue light is the lowest. The light saturation point （LSP） under three kinds of lights vary between 1 800- 2 000μmol/（m^2 .s）, presenting no significant differences; on the other hand, the apparent quantum yield （AQY）, the practical quantum yield （PQY）, the maximum net photosynthetic rate （Pnmax ） and the maximum light conversion efficiency （LCEmax ） of blue light are lower than those of red light; while the light compensation point （LCP） and the light semi-saturation point （ LSPsemi ） of blue light are higher than those of red light. Results indicate that the photosynthesis efficiency of blue light is lower than the red in that the ε of blue light is lower than red.

关 键 词：茄子 光质 光合作用 光吸收 发光二极管 

分 类 号：S625[农业科学—园艺学]