In:
New Phytologist, Wiley, Vol. 218, No. 4 ( 2018-06), p. 1522-1533
Abstract:
Strigolactones ( SL s) are a class of plant hormones which regulate shoot branching and function as host recognition signals for symbionts and parasites in the rhizosphere. However, steps in SL biosynthesis after carlactone ( CL ) formation remain elusive. This study elucidated the common and diverse functions of MAX 1 homologs which catalyze CL oxidation. We have reported previously that Arabidopsis MAX 1 converts CL to carlactonoic acid ( CLA ), whereas a rice MAX 1 homolog has been shown to catalyze the conversion of CL to 4‐deoxyorobanchol (4 DO ). To determine which reaction is conserved in the plant kingdom, we investigated the enzymatic function of MAX 1 homologs in Arabidopsis , rice, maize, tomato, poplar and Selaginella moellendorffii . The conversion of CL to CLA was found to be a common reaction catalyzed by MAX 1 homologs, and MAX 1s can be classified into three types: A1‐type, converting CL to CLA ; A2‐type, converting CL to 4 DO via CLA ; and A3‐type, converting CL to CLA and 4 DO to orobanchol. CLA was detected in root exudates from poplar and Selaginella , but not ubiquitously in other plants examined in this study, suggesting its role as a species‐specific signal in the rhizosphere. This study provides new insights into the roles of MAX 1 in endogenous and rhizosphere signaling.
Type of Medium:
Online Resource
ISSN:
0028-646X
,
1469-8137
DOI:
10.1111/nph.2018.218.issue-4
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
208885-X
detail.hit.zdb_id:
1472194-6
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