Effects of 5-Aminolevulinic Acid ( ALA ) on Chlorophyll FluorescenceDynamics of Watermelon Seedlings under Shade Condition

ACTA HORTICULTURAE SINICA ›› 2007, Vol. 34 ›› Issue (4): 901-908.

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Effects of 5-Aminolevulinic Acid ( ALA ) on Chlorophyll FluorescenceDynamics of Watermelon Seedlings under Shade Condition

SUN Yong-ping ; WANG Liang-ju

(College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China)

Received:1900-01-01 Revised:1900-01-01 Online:2007-08-25 Published:2007-08-25

Abstract

Abstract: The influences of the foliar app lication with 5-aminolevulinic acid (ALA) on dynamics of chlorophyll fluorescence in watermelon (Citrullus lanatus Thunb. Mansfeld) seedlings under shade condition were studied with PAM-2100 Chlorophyll Fluorometer in the work. The results showed that shading significantly depressed chlorophyll fluorescence parameters, whereasALA imp roved the actual photochemical efficiency of photosystemⅡ (ΦPSⅡ) , the electronic transfer rate (ETR) , the photochemical quenching (qP) and the energy distribution in photochemistry (Pc) absorbed by PSⅡreaction center. The treatmentwith 1% diethyldithiocarbamate (DDC), a chelator of Cu²⁺, which inhibits the activity of Cu-Zn-SOD, decreased all the parameters above,
whereas ALA could inverse the inhibition ofDDC, suggesting that p romotion ofALA on photochemical efficiency of PSⅡmight be related with the activities of antioxidant enzymes. The initial fluorescence (Fo) ofwatermelon leaveswas increased by the shade treatment, and companied with a lower level of the maximum photochemical efficiency (Fv/Fm) , suggesting thatwatermelon is a considerably light-loving crop and low light intensity tends to cause ogenesis of photosynthetic apparatus. ButALA and /orDDC did not show any effect on the fluorescence parameterswhich suggested the p romotion ofALA on photochemical efficiency of PSⅡdid not directly relate with the PSⅡreaction centers in watermelon leaves, but related with acceleration of active oxygen metabolism nearby PSⅠreaction centers by increasing the activities of antioxidant enzymes, such as SOD.

Key words: Watermelon, 5-aminolevulinic acid (ALA), Chlorophyll fluorescence, Shade, Diethyldithiocarbamate (DDC)

SUN Yong-ping;WANG Liang-ju. Effects of 5-Aminolevulinic Acid ( ALA ) on Chlorophyll FluorescenceDynamics of Watermelon Seedlings under Shade Condition[J]. ACTA HORTICULTURAE SINICA, 2007, 34(4): 901-908.

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Effects of 5-Aminolevulinic Acid ( ALA ) on Chlorophyll FluorescenceDynamics of Watermelon Seedlings under Shade Condition

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