LED光强对不结球小白菜生长与光合特性的影响  

Influence of LED light intensity on growth and photosynthetic characteristics of non-heading Chinese cabbage

作　　者：丁娟娟[1] 杨振超[1] 王鹏勃 耿凤展[1] 高波[1] 

机构地区：[1]西北农林科技大学园艺学院,农业部西北设施园艺工程重点实验室,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2015年第3期113-118,共6页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家“863”计划项目“植物工厂营养液管理与蔬菜品质调控技术装备研究”(2013AA103004)

摘　　要：【目的】研究LED不同光强对不结球小白菜生长、光合特性及光源能耗的影响,探讨适合不结球小白菜生长的节能高效的光强参数。【方法】以"四季"和"鸡毛"2个不结球小白菜品种为材料,在4个LED光强处理(153,229,287和330μmol/(m2·s))下栽培不结球小白菜,处理48d后测定不结球小白菜的形态指标、生物量、光合指标及LED耗电量。【结果】随光强增加,不结球小白菜茎粗、叶片数、叶面积、生物量均有所增加;株高先降低后增高。除高强光处理(330μmol/(m2·s))外,叶绿素含量均随光强的降低而增加。净光合速率(Pn)、光系统Ⅱ的实际光化学效率(ΦPSⅡ)、光化学量子效率(Fv/Fm)、光化学猝灭系数(qP)和光合电子传递速率(ETR)等指标随光强下降也都呈现减小趋势。光强越低,消耗的电能越小;光强越高,电能转换效率越高。【结论】330μmol/(m2·s)高光强处理增强了光系统Ⅱ反应中心的开放程度和光能转化效率,提高了光合能力,有利于不结球小白菜的正常生长。【Objective】Effects of LED light intensity on growth,photosynthetic characteristics and power consumption of non-heading Chinese cabbage were studied to obtain the optimal light intensity for growth of non-heading Chinese cabbage.【Method】Two varieties of non-heading Chinese cabbage,Siji(SJ)and Jimao(JM),were cultivated under four different LED light intensities(153,229,287,and 330μmol/(m2·s)).After 48 days,morphological indexes,biomass,photosynthetic indexes and LED power consumption were measured.【Result】With the increase of light intensity,stem diameter,number of leaves,leaf area and biomass of non-heading Chinese cabbage increased,while plant height decreased firstly and increased subsequently.With the decrease of light intensity,leaf chlorophyll content increased except for330μmol/(m2·s)treatment.Meanwhile,photosynthetic rate(Pn),actual quantum yield of photosystemⅡ(ΦPSⅡ),maximal photochemical efficiency(Fv/Fm),photochemical quenching(qP),and electron transport rate(ETR)all decreased as the decrease of light intensity.As the decrease of light intensity,both power consumption and power conversion efficiency decreased.【Conclusion】Treatment with the light intensity of 330μmol/(m2·s)enhanced the opening degree,the light energy efficiency of photosystem Ⅱ,and the photosynthetic capacity.Thus,it was beneficial for the growth of non-heading Chinese cabbage.

关 键 词：LED光源 光强 不结球小白菜 生长特性 光合特性 

分 类 号：S634.3[农业科学—蔬菜学]