Journal
DEVELOPMENT
Volume 138, Issue 8, Pages 1531-1539Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/dev.058495
Keywords
Physcomitrella; Strigolactones; CCD8
Categories
Funding
- Ministere de l'Education Nationale, de la Recherche et de la Technologie (MENRT)
- ANR (Agence Nationale de la Recherche) [ANR.05.BLAN.0262]
- KAKANHI [18208010, 2109111]
- Program for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry
- Agence Nationale de la Recherche (ANR) [ANR-05-BLAN-0262] Funding Source: Agence Nationale de la Recherche (ANR)
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Strigolactones are a novel class of plant hormones controlling shoot branching in seed plants. They also signal host root proximity during symbiotic and parasitic interactions. To gain a better understanding of the origin of strigolactone functions, we characterised a moss mutant strongly affected in strigolactone biosynthesis following deletion of the CAROTENOID CLEAVAGE DIOXYGENASE 8 (CCD8) gene. Here, we show that wild-type Physcomitrella patens produces and releases strigolactones into the medium where they control branching of protonemal filaments and colony extension. We further show that Ppccd8 mutant colonies fail to sense the proximity of neighbouring colonies, which in wild-type plants causes the arrest of colony extension. The mutant phenotype is rescued when grown in the proximity of wild-type colonies, by exogenous supply of synthetic strigolactones or by ectopic expression of seed plant CCD8. Thus, our data demonstrate for the first time that Bryophytes (P. patens) produce strigolactones that act as signalling factors controlling developmental and potentially ecophysiological processes. We propose that in P. patens, strigolactones are reminiscent of quorum-sensing molecules used by bacteria to communicate with one another.
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