Glycine maxNNL1 restricts symbiotic compatibility with widely distributed bradyrhizobia via root hair infection
Symbiosis between soybean ( Glycine max ) and rhizobia is essential for efficient nitrogen fixation. Rhizobial effectors secreted through the type-III secretion system are key for mediating the interactions between plants and rhizobia, but the molecular mechanism remains largely unknown. Here, our g...
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Published in | Nature plants Vol. 7; no. 1; pp. 73 - 86 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
London
Nature Publishing Group UK
2021
Nature Publishing Group |
Subjects | |
Online Access | Get full text |
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Summary: | Symbiosis between soybean (
Glycine max
) and rhizobia is essential for efficient nitrogen fixation. Rhizobial effectors secreted through the type-III secretion system are key for mediating the interactions between plants and rhizobia, but the molecular mechanism remains largely unknown. Here, our genome-wide association study for nodule number identified
G. max
Nodule Number Locus 1
(Gm
NNL1
), which encodes a new R protein.
Gm
NNL1 directly interacts with the nodulation outer protein P (NopP) effector from
Bradyrhizobium
USDA110 to trigger immunity and inhibit nodulation through root hair infection. The insertion of a 179 bp short interspersed nuclear element (SINE)
-
like transposon into Gm
NNL1
leads to the loss of function of
Gm
NNL1, enabling bradyrhizobia to successfully nodulate soybeans through the root hair infection route and enhancing nitrogen fixation. Our findings provide important insights into the coevolution of soybean–bradyrhizobia compatibility and offer a way to design new legume–rhizobia interactions for efficient symbiotic nitrogen fixation.
Soybean accessions display a variable number of nodules when colonized by rhizobia. The authors identify one locus controlling this trait, a typical TIR–NBS–LRR disease resistance gene called
NNL1
, and the corresponding bacterial effector called NopP. |
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ISSN: | 2055-0278 |
DOI: | 10.1038/s41477-020-00832-7 |