Comparison of Leaf Functional and Photosynthetic Characteristics in Baijiguan Half-sib Teas

CHEN Changsong;WANG Feng;CHEN Yuzhen;SHAN Ruiyang;WANG Xiuping;LIN Zhenghe;ZHONG Qiusheng;CHEN Zhihui;YU Wenquan;Tea Research Institute, Fujian Academy of Agricultural Sciences, Fujian Branch of China National Center for Tea Improvement;

Baijiguan half-sib teas;;new albino tea strain;;leaf functional;;leaf photosynthetic

With 25 tea strains as experimental material(14 albino tea strains and 14 green tea strains), the spring shoot biomass, growth stages, leaf functional and photosynthetic characteristics of the leaves were monitored, compares with both between difference new tea strains. The results showed that: comparing with female parents(Baijiguan), the spring shoot biomass were increased by 25.0%-106.25%(except 15 and 24) and the growth stages were advanced(early middle growth was 84%) in 25 new tea strains. The leaf area(LA) and specific leaf area(SLA) were significantly higher in albino tea strains than Baijiguan, but the leaf dry matter content(LDMC) had significant decrease, other indicators had no difference. The leaf area(LA) and photosynthetic pigments were significantly increased in green tea strains than in Baijiguan, other indicators were not pronounced. The average of LA and photosynthetic pigments in albino tea strains were significantly below the green tea strains, but the SLA, ratio of chlorophyll a and b(Chla/Chlb) and ratio of carotene and chlorophyll(Car/Chl) were significantly higher than the green tea strains, it may be one of the mechanisms of protecting the leaf from certain wavelengths light damage. Although the chlorophyll content of albino tea strains contains one half of(42.29%) that of the green tea strains, its photosynthetic characteristics indexes approach to that of the green tea strains. Only when the photosynthesis pigments content drops rapidly, the photosynthetic characteristics indexes then significantly decreases, which in the albino tea strains, the photosynthetic efficiency per unit chlorophyll ke eps higher within the certain limits of chlorophyll content, and which may compensate the lower light ha rvest capacity due to Chl deficiency. However, studies of the causes for the differences has yet to be fu rther discussed in physiological and molecular aspects.