Effects of Drought Stress on Photosynthesis of Gerbera Modified by PSAG12-ipt

ACTA HORTICULTURAE SINICA ›› 2007, Vol. 34 ›› Issue (1): 157-162.

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Effects of Drought Stress on Photosynthesis of Gerbera Modified by P_SAG12-ipt

LAI Qi-xian^1,2 ; BAO Zhi-yi¹ ; ZHU Zhu-jun^1*
;MAO Bi-zeng³ ;QIAN Qiong-qiu¹ ; HE Yong¹

(¹ Departm ent of Horticulture, Zhejiang University, Hangzhou 310029, China; ² Tropical Crops Germ plasm Resource Institute,Chinese Academy of Tropical Agricultural Sciences, Danzhou, Hainan 571737, China; ³ Biotechnology Institute, Zhejiang University, Hangzhou 310029, China)

Received:1900-01-01 Revised:1900-01-01 Online:2007-02-25 Published:2007-02-25

Abstract

Abstract: The chlorophyll fluorescence parameters ( actual quantum yield of PSⅡ photochemistry, ΦPS
Ⅱ; quantum efficiency of open PSⅡ reaction centers, Fv’/Fm’; photochemical quenching coefficient, qP;
electron transport rate, ETR) and photosynthesis parameters ( net photosynthetic rate, Pn; stomatal conduct
ance, Gs) of the gerbera modified by P_SAG12-ipt were investigated under drought stress. The results showed that
ΦPSⅡ, Fv’/Fm’, qP, ETR, Pn and Gs decreased after drought stress and gradually increased after wate
ring recovery. However, these decreases caused by drought stress were lower in the modified gerbera than in
the wild type. The modified gerbera showed a higher tolerance to drought stress. The fraction of absorbed light
in photochemistry ( P) decreased under drought stress, but being higher in the modified gerbera than in the
wild type. The fraction of thermal dissipation (D) was increased under drought stress. However, the fraction
of excess energy (E) was not changed during drought stress and recovery

Key words: Gerbera, Drought stress, Chlorophyll fluorescence, Photosynthesis

LAI Qi-xian;;BAO Zhi-yi;ZHU Zhu-jun;MAO Bi-zeng;QIAN Qiong-qiu;HE Yong. Effects of Drought Stress on Photosynthesis of Gerbera Modified by P_SAG12-ipt[J]. ACTA HORTICULTURAE SINICA, 2007, 34(1): 157-162.

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Effects of Drought Stress on Photosynthesis of Gerbera Modified by P_SAG12-ipt

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