Abstract
Vitis vinifera glycosyl hydrolase family 17 (VvGHF17) is a grape apoplasmic β-1,3-glucanase, which belongs to glycosyl hydrolase family 17 in grapevines. β-1,3-glucanase is not only involved in plant defense response but also has various physiological functions in plants. Although VvGHF17 expression is negatively related to the length of inflorescence in grapevines, the physiological functions of VvGHF17 are still uncertain. To clarify the physiological functions of VvGHF17, we conducted a phenotypic analysis of VvGHF17-overexpressing Arabidopsis plants. VvGHF17-overexpressing Arabidopsis plants showed short inflorescence, similar to grapevines. These results suggested that VvGHF17 might negatively regulate the length of inflorescence in plants. VvGHF17 expression induced a delay of floral transition in Arabidopsis plants. The expression level of FLOWERING LOCUS C (FLC), known as a floral repressor gene, in inflorescence meristem of transgenic plants were increased by approximately 10-fold as compared with wild plants. These results suggest that VvGHF17 induces a delay of floral transition by enhancing FLC expression and concomitantly decreases the length of plant inflorescence.
Highlights
Higher plants such as vascular plants have certain defense mechanisms against plant pathogens such as fungi, bacteria, and viruses
The present study demonstrates that Vitis vinifera glycosyl hydrolase family 17 (VvGHF17) delays floral transition in Arabidopsis plant plants
VvGHF17 Expression Is Negatively Related to the Length of Grape Inflorescence
Summary
Higher plants such as vascular plants have certain defense mechanisms against plant pathogens such as fungi, bacteria, and viruses. Pathogenesis-related proteins (PRs) are induced against pathogen invasion in plants and play an important role in plant defense [1]. Β-1,3-Glucanases (glucan endo-1,3-β-D-glucosidase, EC 3.2.1.39) belong to the second (PR-2) of the 17 families and are included in the glycosyl hydrolase family 17 (GHF17) due to their degradation style. Since they hydrolyze 1,3-β-D-glycosidic bonds in β-1,3-glucan as the main component of the cell wall of many fungi [3,4], β-1,3-glucanases are thought to play an important role in the plant defense response against pathogen infection.
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