Photosynthetica 2009, 47(3):347 | DOI: 10.1007/s11099-009-0055-y

Promotion of 5-aminolevulinic acid treatment on leaf photosynthesis is related with increase of antioxidant enzyme activity in watermelon seedlings grown under shade condition

Y. P. Sun1, Z. P. Zhang1, L. J. Wang1,*
1 College of Horticulture, Nanjing Agricultural University, Nanjing, China

Watermelon [Citrullus lanatus (Thunb.) Mansfeld] is a photophilic plant, whose net photosynthetic rate was significantly decreased when seedlings were grown under low light condition. However, treatment with 100 mg kg-1 5-aminolevulinic acid (ALA) could significantly restore the photosynthetic ability under the environmental stress. The parameters of leaf gas exchange, chlorophyll modulated fluorescence and fast induction fluorescence of the ALA-treated plants were higher than that of the control. Additionally, ALA treatment increased the activities of antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD) and ascorbate peroxidase (APX). Nevertheless, the treatment of diethyldithiocarbamate (DDC), an inhibitor of SOD activity, dramatically depressed photosynthesis of watermelon leaves, while ALA could reverse the inhibition of DDC. Therefore, it can be deduced that ALA promotion on photosynthesis of watermelon leaves under low light stress is attributed to its promotion on antioxidant enzyme activities, and the increased activities of the enzymes, which are mainly located near the reaction centers of PSI, can scavenge superoxide anions, leading to an increase of apparent electron transport rate and an alleviation of photosynthetic photoinhibition under the stressed environment.

Additional key words: 5-aminolevulinic acid; antioxidant enzymes; chlorophyll fluorescence; JIP test; low light stress; photosynthesis; watermelon

Received: November 10, 2008; Accepted: May 5, 2009; Published: September 1, 2009  Show citation

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Sun, Y.P., Zhang, Z.P., & Wang, L.J. (2009). Promotion of 5-aminolevulinic acid treatment on leaf photosynthesis is related with increase of antioxidant enzyme activity in watermelon seedlings grown under shade condition. Photosynthetica47(3), 347. doi: 10.1007/s11099-009-0055-y
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