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Transcriptome analysis revealed hormone signaling response of grapevine buds to strigolactones

Z. Min,Ziyu Li,Li Chen,Yang Zhang,Min Liu,Xu Yan,Yu-lin Fang

Published 2021 in Scientia Horticulturae

ABSTRACT

Abstract In grapevines, the frequent germination of prompt buds always leads to tedious task during summer management in vineyards. Strigolactones have been discovered to play an essential role in regulating shoot branching in different plant species. We investigated the effect of strigolactones (SLs) on grapevine prompt bud outgrowth. Two-year-old grape cuttings (Vitis vinifera L.) with non-burst prompt buds were used as material and subjected to decapitation (control group), or decapitation with subsequent GR24 (Germination releaser 24) treatment (GR), an analog of exogenous SLs. Results showed that grapevine bud growth was significantly induced at nodes 1 and 2, but was largely inhibited by GR24 after decapitation. Transcriptome results revealed the involvement of numerous genes associated with hormone synthesis and signal transduction. GR24 treatment could modulate IAA content and inhibit NCED decrease caused by decapitation, which is the key gene involved in ABA biosynthesis, possibly via BRC1-mediated pathway. Key genes participating in BR biosynthesis were largely modulated. The regulation of different hormones (CTK and BR) on cell cycle genes may be another important mechanism of GR24 regulation on grapevine bud outgrowth. Our results could provide new avenues for research and reveal hormone (IAA, ABA, CTK, and BR) signaling response to SLs in managing shoot branching in grapevines.

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