遮荫对茄子幼苗生长和光合特性的影响  

Effects of Shading on Growth and Photosynthetic Characteristics of Eggplant Seedling

作　　者：吴雪霞[1] 查丁石[1] 

机构地区：[1]上海市农业科学院园艺研究所,上海市设施园艺技术重点实验室,上海201106

出　　处：《华北农学报》2010年第3期102-107,共6页Acta Agriculturae Boreali-Sinica

基　　金：“十一五”国家科技支撑计划项目(2008BAD97B06)

摘　　要：以茄子为材料,研究了遮荫处理对茄子幼苗生长和光合作用的影响。结果表明,遮荫处理增加了茄子株高,降低了茎粗、比叶重以及SPAD值;显著降低了茄子叶片的光补偿点(LCP)、光饱和点(LSP)、光饱和光合速率和表观量子效率(AQY)。全光照下,茄子的净光合速率日变化呈双峰曲线,高峰期出现在9:00和13:00,有光合"午休"现象;遮荫条件下,茄子叶片净光合速率日变化均呈单峰曲线,高峰在11:00。遮荫处理使叶片气孔导度(Gs)、蒸腾速率(Tr)、水分利用率(WUE)和气孔限制值(Ls)均下降,胞间CO2浓度(Ci)升高。以上参数表明,遮荫条件下,茄子幼苗生长和光合作用均受到影响,从而导致光合能力的下降,影响其正常生长,且遮荫程度越大,光抑制愈严重。Effects of shading on growth and photosynthesis were conducted in eggplant seedling.The results showed that plant height was higher,but stem diameter,specific leaf weight（SLW） and SPAD value under shading condition were lower than those of control.Light saturation point（LSP）,light compensation point（LCP）,photosynthet-ic rate at light saturation point and apparent quantum yield（AQY） significantly became lower under low light stress.The curves of diurnal variation in net photosynthetic rate（Pn） have two peaks（at 9： 00 and 11： 00）,a midday depres-sion under full sunlight;whereas under shading treatment,the curve has only one peak at 11： 00.Leaf stomata1 con-ductance（Gs）,the transpiration rate（Tr）,water use efficiency（WUE） and stomatal limitation（Ls） were decreased un-der shading,while intercellular CO2concentration（Ci） were increased.The results above indicated the growth and pho-tosynthesis of eggplant were inhibited,which affected the development of the photosynthetic organs,and the photosyn-thetic capacity was declined and normal growth was inhibited,and the inhibition was decreased with increasing of shade degrees.

关 键 词：遮荫 茄子 生长 光合特性 

分 类 号：S641.1[农业科学—蔬菜学]