四川3个特色茶树品种芽叶性状及光合特性分析

Abstract

Abstract: In order to ascertain the photosynthetic performance and production potential of tea plants, three characteristic cultivars in Sichuan, including ‘Emeiwenchun', ‘Chuancha 2' and ‘Ziyan', were used as test materials, and the green leaf cultivar ‘Fudingdabaicha' and purple cultivar ‘Zijuan' were used as control. The photosynthetic index, chlorophyll fluorescence, photosynthetic pigment content and bud and leaf characteristics of these cultivars in spring and summer were determined. The results show that in spring and summer, the net photosynthetic rate (P_n) and water use efficiency (WUE) of the leaves of ‘Chuancha 2' were higher. Its ΦPSⅡ primary light energy conversion efficiency (F_v/F_m) and potential activity (F_v/F₀) were the highest. The photochemical quenching coefficient (qP), the relative share of the photochemical reaction (P) in the energy distribution of the photosystem ΦPSⅡ, the relative share of the reaction center dissipation (E_X) and the carotenoid content of ‘Chuancha 2' were also higher. ‘Emeiwenchun' had the highest P_n and WUE in spring, but low P_n in summer. Its ΦPSⅡ primary light energy conversion efficiency (F_v/F_m) and potential activity (Fv/F₀) were the lowest. The ΦPSⅡ effective photochemical efficiency (F_v'/F_m' ) and ΦPSⅡ actual photosynthetic capacity (PhiPS2) of ‘Emeiwenchun' were the slowest. The effective photochemical efficiency (F_v'/F_m') of ΦPSⅡ of ‘Ziyan' was the highest in spring and summer, and its Pn and photosynthetic pigment contents were higher. Compared with the data in spring, the summer transpiration rate (T_r) and stomatal limit value (L_s) were increased, while WUE and intercellular carbon dioxide concentration (Ci) were decreased in all cultivars. In terms of yield, the yield of ‘Chuancha 2' was significantly higher than those of other cultivars. The yield of ‘Emeiwenchun' was not significantly different from that of ‘Fudingdabaicha', and that of ‘Ziyan' was significantly lower than that of ‘Fudingdabaicha' (P<0.05). It was found that ‘Chuancha 2' had higher photosynthetic efficiency and WUE, and its yield was the highest. ‘Emeiwenchun' had relatively higher yield, photosynthetic capacity and WUE in spring, but lower in summer. The purple cultivar ‘Ziyan' had higher photosynthetic pigment and photosynthetic capacity, but lower yield.

Key words: tea cultivars, bud and leaf traits, yield, photosynthetic characteristics, chlorophyll fluorescence

CLC Number:

S571.1

XIE Wengang, CHEN Wei, TAN Liqiang, YAN Linfeng, TANG Qian. Analysis of Bud and Leaf Characters and Photosynthetic Characteristics of Three Tea Cultivars in Sichuan[J]. Journal of Tea Science, 2021, 41(6): 813-822.

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Analysis of Bud and Leaf Characters and Photosynthetic Characteristics of Three Tea Cultivars in Sichuan

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