Apr 1, 2020

Mechanism of auxin and GA crosstalk in diploid strawberry fruit initiation

BioRxiv : the Preprint Server for Biology
Warrick R NelsonZhongchi Liu

Abstract

Strawberry, a high value fruit crop, has recently become amenable for genetic studies due to genomic resources and CRISPR/CAS9 tools. Unlike ovary-derived botanical fruits, strawberry is an accessory fruit derived from receptacle, the stem tip subtending floral organs. Although both botanical and accessory fruits initiate development in response to auxin and GA released from seeds, the downstream auxin and GA signaling mechanisms underlying accessory fruit development remain unknown. Using wild strawberry, we performed in depth molecular characterizations of accessory fruit development. We show that auxin signaling proteins FveARF8/FveARF6 are bound and hence inhibited by FveIAA4 and FveRGA1, repressors in auxin and GA signaling pathways. This inhibition is relieved post-fertilization or by the application of GA or auxin. Mutants of FveRGA1 developed parthenocarpic fruit suggesting a conserved function of DELLA proteins in fruit set. Further, FveARF8 was found to repress the expression of a GA receptor gene GID1c to control fruit's sensitivity to GA, revealing a novel crosstalk mechanism. We demonstrate that consensus co-expression network provides a powerful tool for non-model species in the selection of interacting genes for ...Continue Reading

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Mentioned in this Paper

Metabolic Process, Cellular
Lebetanthus americanus
Chrysosporium parvum var. crescens
Genome
Genes
Ursus americanus
Candidatus Liberibacter solanacearum
Lysichiton americanus
DNA, Ribosomal
Calcium ion

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