Compar isons of Ascorbic Ac id Contents and Activ ities of Metabolism Relative Enzymes in Apple Leaves of Various Ages

ACTA HORTICULTURAE SINICA ›› 2007, Vol. 34 ›› Issue (4): 995-998.

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Compar isons of Ascorbic Ac id Contents and Activ ities of Metabolism Relative Enzymes in Apple Leaves of Various Ages

MA Chun-hua¹ ;MA Feng-wang^{1, 2*};Li Ming-jun¹ ;HAN Ming-yu¹ ;SHU Huai-rui^{1, 2}

(¹College of Horticulture, N orthwest A & F University, Yangling, Shaanxi 712100, China; ²College of Horticulture Science andEngineering, Shandong Agricultural University, Taipan, Shandong 271018, China)

Received:2006-11-09 Revised:2007-05-25 Online:2007-08-25 Published:2007-08-25

Abstract

Abstract: Ascorbic acid (AsA) metabolism, including AsA content, metabolism relative enzymes ac
tivities and relationship s among them, was investigated in leaves of app le (Malus domestica Borkh. ‘Gala’)
of various ages, i.e. young leaves, expanding leaves, mature leaves, aged leaves. The results showed that to
talAsA content and AsA content changed accordingly, reaching maximum in mature leaves and minimum in
aged leaves, and changes of GalLDH activitywere accordantwith AsA content. W ith the decline ofAPX ac
tivities and accumulation of H₂O₂ , the activities ofMDHAR, DHAR and GR which conduce to regeneration
of AsA were lowest at aged leaves, so as to the extent of AsA oxidation reached maximum in aged leaves.

Key words: Apple, Leaf, Leaf age, Ascorbic acid

MA Chun-hua;MA Feng-wang;;Li Ming-jun;HAN Ming-yu;SHU Huai-rui;. Compar isons of Ascorbic Ac id Contents and Activ ities of Metabolism Relative Enzymes in Apple Leaves of Various Ages[J]. ACTA HORTICULTURAE SINICA, 2007, 34(4): 995-998.

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Compar isons of Ascorbic Ac id Contents and Activ ities of Metabolism Relative Enzymes in Apple Leaves of Various Ages

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