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Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea

E107 and E132 are pea mutants that nodulate poorly. Because they have a shoot-controlled nodulation phenotype, we asked if their mutated genes were implicated in the autoregulation of nodulation (AON), a mechanism which consists of two systemic circuits, the positive CEP/CRA2 and the negative CLE/SU...

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Autores principales: Huynh, Christian A., Guinel, Frédérique C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7694783/
https://www.ncbi.nlm.nih.gov/pubmed/33172149
http://dx.doi.org/10.3390/plants9111505
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author Huynh, Christian A.
Guinel, Frédérique C.
author_facet Huynh, Christian A.
Guinel, Frédérique C.
author_sort Huynh, Christian A.
collection PubMed
description E107 and E132 are pea mutants that nodulate poorly. Because they have a shoot-controlled nodulation phenotype, we asked if their mutated genes were implicated in the autoregulation of nodulation (AON), a mechanism which consists of two systemic circuits, the positive CEP/CRA2 and the negative CLE/SUNN, coordinated via NIN and miR2111. We further characterized the mutants’ phenotype by studying nodule distribution and nodulation efficiency. E107 was similar to wild-type (WT) in its nodule distribution, but E132 had an extended nodulation zone with nodules forming distally on its lateral roots. Moreover, we tested whether their shoots produced a compound inhibitory to nodulation. We made ethyl-acetate extracts of roots and shoots of both mutants and WT, which we applied to rhizobia-inoculated WT seedlings and to pure rhizobial cultures. Whereas free-living bacteria were unaffected by any of the extracts, WT treated with shoot extracts from either inoculated mutant had fewer nodules than that of control. E107 and E132 shoot extracts led to a 50% and a 35% reduction in nodule number, respectively. We propose that E107 and E132 belong to a new sub-class of AON mutants, i.e., hypo-nodulators, and that their respective gene products are acting in the AON descending branch, upstream of TML signaling.
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spelling pubmed-76947832020-11-28 Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea Huynh, Christian A. Guinel, Frédérique C. Plants (Basel) Communication E107 and E132 are pea mutants that nodulate poorly. Because they have a shoot-controlled nodulation phenotype, we asked if their mutated genes were implicated in the autoregulation of nodulation (AON), a mechanism which consists of two systemic circuits, the positive CEP/CRA2 and the negative CLE/SUNN, coordinated via NIN and miR2111. We further characterized the mutants’ phenotype by studying nodule distribution and nodulation efficiency. E107 was similar to wild-type (WT) in its nodule distribution, but E132 had an extended nodulation zone with nodules forming distally on its lateral roots. Moreover, we tested whether their shoots produced a compound inhibitory to nodulation. We made ethyl-acetate extracts of roots and shoots of both mutants and WT, which we applied to rhizobia-inoculated WT seedlings and to pure rhizobial cultures. Whereas free-living bacteria were unaffected by any of the extracts, WT treated with shoot extracts from either inoculated mutant had fewer nodules than that of control. E107 and E132 shoot extracts led to a 50% and a 35% reduction in nodule number, respectively. We propose that E107 and E132 belong to a new sub-class of AON mutants, i.e., hypo-nodulators, and that their respective gene products are acting in the AON descending branch, upstream of TML signaling. MDPI 2020-11-06 /pmc/articles/PMC7694783/ /pubmed/33172149 http://dx.doi.org/10.3390/plants9111505 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Huynh, Christian A.
Guinel, Frédérique C.
Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea
title Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea
title_full Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea
title_fullStr Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea
title_full_unstemmed Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea
title_short Shoot Extracts from Two Low Nodulation Mutants Significantly Reduce Nodule Number in Pea
title_sort shoot extracts from two low nodulation mutants significantly reduce nodule number in pea
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7694783/
https://www.ncbi.nlm.nih.gov/pubmed/33172149
http://dx.doi.org/10.3390/plants9111505
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