Sammanfattning

The plant hormone auxin (indole-3-acetic acid [IAA]) has previously been suggested to regulate diverse forms of dormancy in both seed plants and liverworts. Here, we use loss-and gain-of-function alleles for auxin synthesis-and signaling-related genes, as well as pharmacological approaches, to study how auxin regulates development and dormancy in the gametophyte generation of the liverwort Marchantia polymorpha. We found that M. polymorpha possess the smallest known toolkit for the indole-3-pyruvic acid (IPyA) pathway in any land plant and that this auxin synthesis pathway mainly is active in meristematic regions of the thallus. Previously a Trp-independent auxin synthesis pathway has been suggested to produce a majority of IAA in bryophytes. Our results indicate that the Trp-dependent IPyA pathway produces IAA that is essential for proper development of the gametophyte thallus of M. polymorpha. Furthermore, we show that dormancy of gemmae is positively regulated by auxin synthesized by the IPyA pathway in the apex of the thallus. Our results indicate that auxin synthesis, transport, and signaling, in addition to its role in growth and development, have a critical role in regulation of gemmae dormancy in M. polymorpha.

Publicerad i

Plant Cell
2015, Volym: 27, nummer: 6, sidor: 1650-1669
Utgivare: AMER SOC PLANT BIOLOGISTS

SLU författare

• Bhalerao, Rishikesh P.

  • Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet
    
  • King Saud University

UKÄ forskningsämne

Cellbiologi
Botanik


More information

Correction in: The Plant Cell, 2016, Volume: 28: 266, January 2016. http://www.plantcell.org/content/plantcell/28/1/266.full.pdf


Publikationens identifierare

DOI: https://doi.org/10.1105/tpc.15.00065

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/75632