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Title: Cross-species functional diversity within the PIN auxin efflux protein family

Journal Article · · eLife

In Arabidopsis, development during flowering is coordinated by transport of the hormone auxin mediated by polar-localized PIN-FORMED1 (AtPIN1). However Arabidopsis has lost a PIN clade sister to AtPIN1, Sister-of-PIN1 (SoPIN1), which is conserved in flowering plants. Here, we previously proposed that the AtPIN1 organ initiation and vein patterning functions are split between the SoPIN1 and PIN1 clades in grasses. Here we show that in the grass Brachypodium sopin1 mutants have organ initiation defects similar to Arabidopsis atpin1, while loss of PIN1 function in Brachypodium has little effect on organ initiation but alters stem growth. Heterologous expression of Brachypodium SoPIN1 and PIN1b in Arabidopsis provides further evidence of functional specificity. SoPIN1 but not PIN1b can mediate flower formation in null atpin1 mutants, although both can complement a missense allele. The behavior of SoPIN1 and PIN1b in Arabidopsis illustrates how membrane and tissue-level accumulation, transport activity, and interaction contribute to PIN functional specificity.

Research Organization:
Agricultural Research Service, Albany, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AI02-07ER64452
OSTI ID:
1417010
Journal Information:
eLife, Vol. 6; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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On the mechanisms of development in monocot and eudicot leaves journal August 2018
Implications of region‐specific gene expression for development of the partially fused petunia corolla journal July 2019
Transcription of specific auxin efflux and influx carriers drives auxin homeostasis in tobacco cells journal August 2019
Form, development and function of grass stomata journal November 2019
Self-organizing periodicity in development: organ positioning in plants journal February 2018
Organ and Tissue-Specific Localisation of Selected Cell Wall Epitopes in the Zygotic Embryo of Brachypodium distachyon journal March 2018
In Vitro Tissue Culture in Brachypodium: Applications and Challenges journal February 2020