POLYAMINE METABOLISM IN NODULES OF VIGNA-MUNGO DURING SENESCENCE

被引：14

作者：

LAHIRI, K

CHATTOPADHYAY, S

GHOSH, B

机构：

[1] Plant Physiology Laboratory, Department of Botany, Bose Institute 93/1, Calcutta, 700 009, Acharya P.C. Road

来源：

PHYTOCHEMISTRY | 1992年 / 31卷 / 12期

关键词：

VIGNA-MUNGO; FABACEAE; BLACKGRAM; NODULE; SENESCENCE; POLYAMINE METABOLISM;

D O I：

10.1016/0031-9422(92)80419-F

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The polyamine (PA) concentration was greatest in the nodules at stage 2 (flowering) in Vigna mungo. The amount of putrescine (Put) was the highest and changed significantly with senescence, whereas the spermine (Spm) level was the least. During senescence, both arginine decarboxylase (ADC, EC 4.1.1.19) and ornithine decarboxylase (ODC, EC 4.1.1.17) were positively correlated with the endogenous PA titre, particularly in the late stages of development, while the catabolic enzyme, diamine oxidase (DAO, EC 1.4.3.6) increased with senescence, being highest (five-fold) in nodules at stage 5 (i.e. mature pod stage). In vivo labelling studies using L-[U-C-14]arginine with difluoromethylarginine (DFMA) and difluoromethylornithine (DFMO) indicated that both Put biosynthetic enzymes are involved during the process of senescence. Moreover, Spm promoted nitrogenase activity in vivo.

引用

页码：4087 / 4090

页数：4

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