Diurnal Variations of Carbohydrate Contents and Activities of Related Enzymes in Leaves in Response to Defruiting in Peach Trees

ACTA HORTICULTURAE SINICA ›› 2006, Vol. 33 ›› Issue (3): 605-608.

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Diurnal Variations of Carbohydrate Contents and Activities of Related Enzymes in Leaves in Response to Defruiting in Peach Trees

Li Weidong^{1, 2};Wu Benhong²; Li Shaohua^2*;and Li Liansheng²

(¹ College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China; ² Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China )

Received:2005-08-23 Revised:2005-12-06 Online:2006-06-25 Published:2006-06-25

Abstract

Abstract: Diurnal variations of carbohydrate content and activities of related enzymes in source leaves in response to defruiting were studied during endocarp hardening and final rapid fruit growth stages of‘Yanfeng Yihao’peach. Results showed that total soluble sugar, sorbitol, sucrose and starch contents, opposite to glucose and fructose contents, tended to increase during the day in source leaves for both retaining fruit ( control) and defruiting treatments ( defruiting). Defruiting resulted in significantly higher contents of sorbitol and
starch, and higher activities of aldose-6-phosphate reductase (A6PR) and ADP-glucose pyrophosphorylase (ADPGPPase) as compared with the control atmost time during a day. Moreover, the role of accumulation of end-product and activities of related enzymes in leaves on reduced photosynthesis under a low sink source ratio in fruit trees was discussed in this paper.

Key words: Peach, Sink-source relationship, Carbohydrate, Metabolism

Li Weidong;;Wu Benhong;Li Shaohua;and Li Liansheng. Diurnal Variations of Carbohydrate Contents and Activities of Related Enzymes in Leaves in Response to Defruiting in Peach Trees[J]. ACTA HORTICULTURAE SINICA, 2006, 33(3): 605-608.

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Diurnal Variations of Carbohydrate Contents and Activities of Related Enzymes in Leaves in Response to Defruiting in Peach Trees

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