不同光质LED光源对黄瓜苗期生长及叶绿素荧光参数的影响

Effects of Different LED Light Qualities on Cucumber Seedling Growth and Chlorophyll Fluorescence Parameters

【目的】研究不同光质光源对黄瓜幼苗生长、光合色素含量及叶绿素荧光参数的影响。【方法】以发光二极管(LED)精量调制光质和光强(红光、蓝光、白光和红蓝混合光),白光作为对照,黄瓜品种银胚99为试材,研究不同光质LED光源(W、R、B、7R/3B、8R/2B、9R/1B)对幼苗的影响。【结果】在不同光质的影响下,黄瓜幼苗生长存在差异。蓝光(B)处理下可以明显提高植株的茎粗、叶绿素及类胡萝卜素含量;红蓝组合光有利于黄瓜幼苗的生长发育,7R/3B、8R/2B、9R/1B处理下壮苗指数、植株干物质量、Fv/Fm、ФPSII和qP均高于单一的红(R)、蓝(B)光处理;红光(R)处理下黄瓜幼苗的生物量和NPQ最大,处理期间叶绿素a/b值居高,呈现阳生植物的特性。【结论】红蓝组合光有利于黄瓜幼苗的生长,其株高、壮苗指数、植株干物质量及Fv/Fm、ФPSII和qP值与对照和单色光处理相比,均有显著提高,增强了光系统Ⅱ反应中心的开放程度和光能转换效率,保护了光系统Ⅱ的健康,尤以8R/2B处理表现突出。

【Objective】 The differences of cucumber seedling growth,as well as variances of chlorophyll content and chlorophyll fluorescence parameters were studied.【Method】Red light,blue light,red＋blue（R＋B） light generated by light-emitting-diode,white light as control,were applied to study the influences of different LED light qualities such as W,R,B,7R/3B,8R/2B,9R/1B on cucumber seedling leaves with Yinpei 99 as materials.【Result】 The differences of cucumber seedling showed that although treatments by single red light,blue light or white light had no significant effect on plant height and leaf length or width,obvious increase was observed about stem diameter,contents of chlorophyll and carotenoid in the blue light treatment.Moreover,the highest biomass,and NPQ were observed in red light treatment,with typical character of sun plants due to higher ratio of chlorophyll a/b.Furthermore,it was showed that a several combination of red＋blue（R＋B） treatment was beneficial to the growth of cucumber seeding,and seedling index,dry plant weight,Fv/Fm、ФPSII and qP were significantly higher than those of single red or blue light treatment.【Conclusion】 It was concluded that 8R/2B treatment showed its superiority with significant increase of plant height,seedling index,dry plant weight as well as Fv/Fm,ФPSII and qP,so 8R/2B treatment enhanced the opening degree,the light energy conversion efficiency of photosystemⅡ,and protected the effect of photosystemⅡ.