Iron Deficiency-induced Increase of Root Branching Contributes to the Enhanced Root Ferric Chelate Reductase Activity
Iron Deficiency-induced Increase of Root Branching Contributes to the Enhanced Root Ferric Chelate Reductase Activity
复制标题
DOI：
10.1111/j.1744-7909.2008.00654.x
复制
发表时间：
2008-12-01
影响因子：
11.4
通讯作者：
Zheng, Shao-Jian
中科院分区：
文献类型：
--
作者：
Jin, Chong-Wei;Chen, Wei-Wei;Zheng, Shao-Jian
在各种植物中，缺铁增加侧根分枝。然而，这种形态学改变是否有助于铁缺乏诱导的生理反应仍有待证明。以红三叶草（Trifolium pretense L.）缺铁处理显著提高了水稻的铁螯合还原酶（FCR）活性，且总侧根数与铁螯合还原酶（FCR）活性呈良好的相关性。通过分析Dasgan等（2002）的结果，我们还发现，虽然两个番茄基因型line 227/1（P1）和Roza（P2）及其正反交F1代杂种系（“P1 × P2”和“P2 × P1”）在两种不同的低Fe条件（10（-6）和10（-7）M FeEDDHA）下培养，FCR活性与侧根数呈显著正相关。更有趣的是，这四个番茄品系的耐铁黄化能力与侧根密度表现出相似的趋势。综上所述，缺铁诱导的侧根生长在水稻抗缺铁胁迫中发挥重要作用，这可能是铁高效作物选育的重要途径。
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 x P2" and "P2 x 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.