Differential regulation of transcripts encoding cytosolic NADP-malic enzyme in C3 and C4 Flaveria species

被引：43

作者：

Lai, LB ^{[1
]}

Tausta, SL ^{[1
]}

Nelson, TM ^{[1
]}

机构：

[1] Yale Univ, Dept Mol Cellular & Dev Biol, New Haven, CT 06520 USA

来源：

PLANT PHYSIOLOGY | 2002年 / 128卷 / 01期

关键词：

D O I：

10.1104/pp.010449

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

A cytosolic NADP-malic enzyme (CYTME) has been described previously in several plants, all C, species. CYTME is distinct from the chloroplastic NADP-malic enzyme (CHLME) that is highly active in C-4 species. We show that at least one Cytme gene is present in all Flaveria spp., including C-3, C-4, and C-3-C-4 intermediate types. Based on the CytMe expression patterns in Flaveria pringlei (C-3) and Flaveria trinervia (C-4), we suggest CYTME has several distinct roles, including the supplying of NADPH for cytosolic metabolism, the supporting of wound response or repair, and the balancing of cellular pH in illuminated leaves. These three roles are likely correlated with CytMe mRNAs of apparent sizes 2.0, 2.2, and 2.4 kb, respectively, which differ in the length of the 5' untranslated regions. Various regulatory mechanisms involving RNA processing and translational efficiency are discussed.

引用

页码：140 / 149

页数：10

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