Photo inhibition and Recovery of Photosyn thesis in Pear Leaves

ACTA HORTICULTURAE SINICA ›› 2009, Vol. 36 ›› Issue (9): 1261-1268.

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Photo inhibition and Recovery of Photosyn thesis in Pear Leaves

WANG Zhen-lei¹;CHEN Hai-jiang^2*;LIN Min-juan³;XU Ji-zhong²

(¹Teaching Affairs Office, Tarim University, Alar, Xinjiang 843300, China; ²College of Horticulture, AgriculturalUniversity of Hebei, Baoding, Hebei 071001,China;³ College of Plant Science and Technology, Tarim University, A lar, X injiang 843300,China)

Received:2009-01-20 Revised:2009-07-02 Online:2009-09-25 Published:2009-09-25
Contact: CHEN Hai-jiang

Abstract

Abstract: Photosynthesis and chlorophyll fluorescence parameters are measured onWhangkeumbae and Yali pear leaves and their disks in natural and simulated light. The results showed that net photosynthetic rate (P_n), apparent quantum yield (AQY) , and photochemical efficiency of PSⅡ ( F_v /F_m ) decreased and minimal initial fluorescence ( F_o ) was imp roved after being exposed to midday high irradiance, indicating that photoinhibition of Whangkeumbae pear and Yali pear occurred. However, photoinhibition was only induced by high light and could be recovered after 2-4 hours of low light, it indicated that photoinhibition only induced by high light is reversible. Photochemical efficiency of PSⅡ (F_v/F_m ) decreased and minimal initial fluorescence (F_o) was imp roved after being exposed to DTT, which indicate that Xanthophyll cycle was the major protective mechanism to prevent from the deteriorating effects of strong light in the pear leaves; The capacity of
patience and recovery of Yali on strong light stress was stronger than that ofWhankgeumbae, indicating that the extent of photoinhibition varied with varieties in pear.

Key words: pear, photoinhibition of photosynthesis, recovery of photoinhibition, chlorophyll fluorescence

CLC Number:

S 661.2

WANG Zhen-lei;CHEN Hai-jiang;LIN Min-juan;XU Ji-zhong. Photo inhibition and Recovery of Photosyn thesis in Pear Leaves[J]. ACTA HORTICULTURAE SINICA, 2009, 36(9): 1261-1268.

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Photo inhibition and Recovery of Photosyn thesis in Pear Leaves

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