Effects of DA-6 on Chlorophyll Biosythesis Pathway in Peach Leaves

ACTA HORTICULTURAE SINICA ›› 2012, Vol. 39 ›› Issue (4): 621-628.

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Effects of DA-6 on Chlorophyll Biosythesis Pathway in Peach Leaves

YANG Qing, AI Sha-Jiang- · Mai-Mai-Ti, WANG Zhi-Xia, LIU Guo-Jie

（Department of Pomology，College of Agronomy and Biotechnology，China Agricultural University，Beijing 100193，China）

Online:2012-04-25 Published:2012-04-25

Abstract

Abstract: Taken ‘Xiangshan Honey’ peach as the material，the change of chlorophyll precursor contents and activity of the key enzymes in chlorophyll biosynthesis pathway after DA-6 （N-diethylaminoethyl hexanote）application were investigated the underlying mechanism of DA-6 induced leaf chlorophyll content increase. Compared with the control，20 mg · L^-1 foliar DA-6 spray significantly increased the contents of chlorophylls，especially that of chlorophyll b，and chlorophyll intermediate products porphobilinogen（PBG）and uroporphyrinoge（Urogen Ⅲ），whereas decreased the amount of chlorophyll precursor 5-aminolevulinic acid（ALA）. The results suggested the transformation from ALA to PBG and PBG to Urogen Ⅲ was up-regulated. The key enzymes catalyzing the two reactions are 5-aminolevulinate dehydratase（ALAD）and uroporporphyrinogn Ⅲ synthase（UROS），their enhanced activity after DA-6 foliar spraying was assayed. Our study demonstrated that foliar spray DA-6 increased the conversion efficiency of ALA to PBG and PBG to Urogen Ⅲ，up-regulated the chlorophyll biosynthesis pathway and resulted in higher chlorophyll content in peach leaves.

Key words: peach, DA-6, chlorophyll, biosynthesis, precursors, key enzyme, enzyme activity

CLC Number:

S 662.1

YANG Qing, AI Sha-Jiang- · Mai-Mai-Ti, WANG Zhi-Xia, LIU Guo-Jie. Effects of DA-6 on Chlorophyll Biosythesis Pathway in Peach Leaves[J]. ACTA HORTICULTURAE SINICA, 2012, 39(4): 621-628.

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Effects of DA-6 on Chlorophyll Biosythesis Pathway in Peach Leaves

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