High nitrogen use efficiency in rice genotypes is associated with higher net photosynthetic rate at lower Rubisco content

被引：39

作者：

Ray, D ^{[1
]}

Sheshshayee, MS ^{[1
]}

Mukhopadhyay, K ^{[1
]}

Bindumadhava, H ^{[1
]}

Prasad, TG ^{[1
]}

Kumar, MU ^{[1
]}

机构：

[1] Univ Agr Sci Bangalore, Dept Crop Physiol, Bangalore 560065, Karnataka, India

来源：

BIOLOGIA PLANTARUM | 2003年 / 46卷 / 02期

关键词：

leaf mass ratio; leaf nitrogen content; Oryza sativa; Rubisco efficiency;

D O I：

10.1023/A:1022858828972

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Contrasting rice genotypes differing in leaf mass ratio (LMR) and leaf nitrogen content were screened. A strong inverse relationship was observed between ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) content and its efficiency estimated as the ratio of net photosynthetic rate (P-N) to Rubisco content. Similarly, an inverse relationship between the specific activity of fully activated Rubisco and its content was observed. This suggests that a down regulation of Rubisco may occur if the efficiency of the enzyme is superior. Genotypes IET 12989 and IET 13567 recorded higher P-N together with lower Rubisco content in comparison with other genotypes measured. These genotypes showed low LMR and low nitrogen content and hence could be considered as efficient nitrogen users.

引用

页码：251 / 256

页数：6

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