| Full text | |
| Author(s): |
Santos-Filho, Plinio Rodrigues
[1]
;
Saviani, Elzira Elisabeth
[1]
;
Salgado, Ione
[1]
;
Oliveira, Halley Caixeta
[1]
Total Authors: 4
|
| Affiliation: | [1] State Univ Campinas UNICAMP, Inst Biol, Dept Plant Biol, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Amino Acids; v. 46, n. 4, p. 1121-1129, APR 2014. |
| Web of Science Citations: | 2 |
| Abstract | |
Carbon (C) and nitrogen (N) metabolism are integrated processes that modulate many aspects of plant growth, development, and defense. Although plants with deficient N metabolism have been largely used for the elucidation of the complex network that coordinates the C and N status in leaves, studies at the whole-plant level are still lacking. Here, the content of amino acids, organic acids, total soluble sugars, starch, and phenylpropanoids in the leaves, roots, and floral buds of a nitrate reductase (NR) double-deficient mutant of Arabidopsis thaliana (nia1 nia2) were compared to those of wild-type plants. Foliar C and N primary metabolism was affected by NR deficiency, as evidenced by decreased levels of most amino acids and organic acids and total soluble sugars and starch in the nia1 nia2 leaves. However, no difference was detected in the content of the analyzed metabolites in the nia1 nia2 roots and floral buds in comparison to wild type. Similarly, phenylpropanoid metabolism was affected in the nia1 nia2 leaves; however, the high content of flavonol glycosides in the floral buds was not altered in the NR-deficient plants. Altogether, these results suggest that, even under conditions of deficient nitrate assimilation, A. thaliana plants are capable of remobilizing their metabolites from source leaves and maintaining the C-N status in roots and developing flowers. (AU) | |
| FAPESP's process: | 08/11636-5 - Nitric oxide signaling in plant defense response against pathogen attack: analysis of gene expression, production of secundary compounds and mitochondrial bioenergetics |
| Grantee: | Ione Salgado |
| Support Opportunities: | Regular Research Grants |