Ethylene-mediated phenotypic plasticity in root nodule development on Sesbania rostrata
Ethylene-mediated phenotypic plasticity in root nodule development on Sesbania rostrata
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DOI：
10.1073/pnas.95.21.12724
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发表时间：
1998-10-13
影响因子：
11.1
通讯作者：
Holsters, M
中科院分区：
文献类型：
--
作者：
Fernández-López, M;Goormachtig, S;Holsters, M
与根瘤菌共生的豆科植物形成具有持久分生组织的不定根瘤或具有短暂分生组织区域的有限根瘤。长喙田菁（Sesbania rostrata）的茎节和根瘤被认为是有限的，但根瘤的发育是杂种的，早期阶段类似于无限的根瘤。在这里，我们表明，根据环境条件，成熟的根瘤可以是不确定的类型。植物细胞分裂分子标记的原位杂交，以及细菌结瘤和nif基因表达的模式，证实了30天的功能性根瘤的不确定性。实验数据提供的证据表明，开关在结节类型介导的植物激素乙烯。
Leguminous plants in symbiosis with rhizobia form either indeterminate nodules with a persistent meristem or determinate nodules with a transient meristematic region. Sesbania rostrata was thought to possess determinate stem and root nodules, However, the nature of nodule development is hybrid, and the early stages resemble those of indeterminate nodules. Here we show that, depending on the environmental conditions, mature root nodules can be of the indeterminate type. In situ hybridizations with molecular markers for plant cell division, as well as the patterns of bacterial nod and nif gene expression, confirmed the indeterminate nature of 30-day-old functional root nodules. Experimental data provide evidence that the switch in nodule type is mediated by the plant hormone ethylene.