Supported by the National Natural Science Foundation of China (30625026) and the Program for New Century Excellent Talents in University (NCET-04-0554).
Iron Deficiency-induced Increase of Root Branching Contributes to the Enhanced Root Ferric Chelate Reductase Activity
Article first published online: 21 APR 2008
© 2008 Institute of Botany, the Chinese Academy of Sciences
Journal of Integrative Plant Biology
Volume 50, Issue 12, pages 1557–1562, December 2008
How to Cite
Jin, C.-W., Chen, W.-W., Meng, Z.-B. and Zheng, S.-J. (2008), Iron Deficiency-induced Increase of Root Branching Contributes to the Enhanced Root Ferric Chelate Reductase Activity. Journal of Integrative Plant Biology, 50: 1557–1562. doi: 10.1111/j.1744-7909.2008.00654.x
- Issue published online: 25 NOV 2008
- Article first published online: 21 APR 2008
- Received 29 Nov. 2007 Accepted 20 Dec. 2007
- Fe deficiency;
- ferric chelate reductase;
- lateral root;
- red clover;
In various plant species, Fe deficiency increases lateral root branching. However, whether this morphological alteration contributes to the Fe deficiency-induced physiological responses still remains to be demonstrated. In the present research, we demonstrated that the lateral root development of red clover (Trifolium pretense L.) was significantly enhanced by Fe deficient treatment, and the total lateral root number correlated well with the Fe deficiency-induced ferric chelate reductase (FCR) activity. By analyzing the results from Dasgan et al. (2002), we also found that although the two tomato genotypes line227/1 (P1) and Roza (P2) and their reciprocal F1 hybrid lines (“P1 × P2” and “P2 × P1”) were cultured under two different lower Fe conditions (10−6 and 10−7 M FeEDDHA), their FCR activities are significantly correlated with the lateral root number. More interestingly, the -Fe chlorosis tolerant ability of these four tomato lines displays similar trends with the lateral root density. Taking these results together, it was proposed that the Fe deficiency-induced increases of the lateral root should play an important role in resistance to Fe deficiency, which may act as harnesses of a useful trait for the selection and breeding of more Fe-efficient crops among the genotypes that have evolved a Fe deficiency-induced Fe uptake system.