不同光质处理对"中茶108"生长及光合特性的影响OA

The aim of this study was to investigate the effects of different light qualities on the growth and photosynthetic characteristics of Zhongcha 108(Camellia sinensis(Linnaeus)).cv.Zhongcha 108).Three light qualities,red light(R),blue light(B),and red-blue light 1:1(RB),were used for the treatments,and full-spectrum(CK)was used as the control group,internode length,leaf area,chlorophyll content,and whole-plant biomass,as well as the transpiration rate(Tr),stomatal conductance(Gs),inter-cellular CO2 concentration(Ci),and the net photosynthetic rate(Pn)were screened out as the most important photosynthetic indexes,such as the transpiration rate(Tr),stomatal conductance(Gs),inter-cellular CO2 concentration(Ci),and net photosynthetic rate(Pn).and net photosynthetic rate(Pn)in order to select the most suitable red and blue light quality ratios for facility cultivation in Bayi District,Linzhi,Xizang.The results showed that different light qualities promoted the growth of"Zhongcha 108",but the effects varied.The R treatment significantly increased the ground diameter and internode length;the leaf area was the largest under the RB treatment;and the chlorophyll content was the highest under the B treatment.Under different light intensity conditions,the RB treatment showed the best performance in terms of Tr,Gs,and Ci,while Pn was the highest under the B treatment and peaked when the light intensity reached 1 400 μmol·m-2·s-1.The best biomass was recorded under the CK treatment,with a total fresh weight of(15.66±1.20)g and a total dry weight of(5.91±2.50)g.The results of principal component analysis(PCA)showed that the first principal component explained 68.84%of the variance and the second principal component explained 25.21%.In practical agricultural production,in order to promote the robust growth of seedlings,it is recommended to use red light illumination in the early stage and appropriately increase the proportion of blue light to enhance crop quality and yield;in the later stage,it is recommended to use natural light to promote the accumulation of overall plant biomass.