Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310029, China.
J Integr Plant Biol. 2008 Dec;50(12):1557-62. doi: 10.1111/j.1744-7909.2008.00654.x.
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.
在各种植物物种中，铁缺乏会增加侧根分枝。然而，这种形态改变是否有助于铁缺乏引起的生理反应仍有待证明。在本研究中，我们证明了缺铁处理显著增强了红三叶草（Trifolium pretense L.）的侧根发育，并且总侧根数与铁螯合还原酶（FCR）活性与铁缺乏诱导的关系良好。通过分析 Dasgan 等人的结果（2002 年），我们还发现，尽管两个番茄基因型 line227/1（P1）和 Roza（P2）及其相互的 F1 杂种系（“P1 x P2”和“P2 x P1”）在两种不同的低铁条件（10（-6）和 10（-7）M FeEDDHA）下培养，但它们的 FCR 活性与侧根数量显著相关。更有趣的是，这四条番茄线的缺铁耐性能力与侧根密度显示出相似的趋势。综合这些结果，有人提出，铁缺乏诱导的侧根增加可能在抗缺铁性方面发挥重要作用，这可能成为选择和培育具有铁缺乏诱导的铁吸收系统的基因型中更高效利用铁作物的有用性状的手段。
