A plant regulator controlling development of symbiotic root nodules

被引:645
作者
Schauser, L [1 ]
Roussis, A [1 ]
Stiller, J [1 ]
Stougaard, J [1 ]
机构
[1] Aarhus Univ, Dept Mol & Struct Biol, Lab Gene Express, DK-8000 Aarhus C, Denmark
关键词
D O I
10.1038/46058
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Symbiotic nitrogen-fixing root nodules on legumes are founded by root cortical cells that de-differentiate and restart cell division to establish nodule primordia. Bacterial microsymbionts invade these primordia through infection threads laid down by the plant and, after endocytosis, membrane-enclosed bacteroids occupy cells in the nitrogen-fixing tissue of functional nodules, The bacteria excrete lipochitin oligosaccharides(1,2), triggering a developmental process that is controlled by the plant and can be suppressed, Nodule inception initially relies on cell competence in a narrow infection zone located just behind the growing root tip. Older nodules then regulate the number of nodules on a root system by suppressing the development of nodule primordia(3), To identify the regulatory components that act early in nodule induction, ive characterized a transposon-tagged Lotus japonicus mutant, nin (for nodule inception), arrested at the stage of bacterial recognition. We show that rlin is required for the formation of infection threads and the initiation of primordia, NlN protein has regional similarity to transcription factors, and the predicted DNA-binding/dimerization domain identifies and typifies a consensus motif conserved in plant proteins with a function in nitrogen-controlled development.
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收藏
页码:191 / 195
页数:5
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