Intracellular Fe content influences nodulation competitiveness of Sinorhizobium meliloti strains as inocula of alfalfa

被引：10

作者：

Battistoni, F ^{[1
]}

Platero, R ^{[1
]}

Noya, F ^{[1
]}

Arias, A ^{[1
]}

Fabiano, E ^{[1
]}

机构：

[1] IIBCE MEC, Dept Bioquim, Lab Ecol Microbiana, Montevideo 11600, Uruguay

来源：

SOIL BIOLOGY & BIOCHEMISTRY | 2002年 / 34卷 / 05期

关键词：

iron starvation; rhizobia; competitiveness; alfalfa; Sinorhizobium; siderophores; nodule occupancy;

D O I：

10.1016/S0038-0717(01)00215-2

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Rhizobia, as well as most soil bacteria, frequently face variable Fe conditions. The effects of Fe limitation or starvation upon rhizobia infectiveness are not fully understood. Our aim was to evaluate the effects of Fe limitation as well as the ability to acquire Fe in rhizobia competitiveness. Sinorhizobium meliloti 242 wild type strain and one of two-iron acquisition mutants (2.1 and 5.6) were co-inoculated at equal ratio onto alfalfa plants. Legumes were grown under gnotobiotic conditions in Fe-supplemented or Fe-chelated defined medium. Our results show that highly efficient Fe acquisition systems are involved in nodule competitiveness when Fe availability is low. Moreover, Fe-scarce inocula were out-competed by Fe-sufficient inocula. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：593 / 597

页数：5

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