title: Gibberellin application at pre-bloom in grapevines down-regulates the expressions of VvIAA9 and VvARF7, negative regulators of fruit set initiation, during parthenocarpic fruit development.
abstract: Fruit set is initiated only after fertilization and is tightly regulated primarily by gibberellins (GAs) and auxins. The application of either of these hormones induces parthenocarpy, fruit set without fertilization, but the molecular mechanism underlying this induction is poorly understood. In the present study, we have shown that the parthenocarpic fruits induced by GA application at pre-bloom result from the interaction of GA with auxin signaling. The transcriptional levels of the putative negative regulators of fruit set initiation, including Vitis auxin/indole-3-acetic acid transcription factor 9 (VvIAA9), Vitis auxin response factor 7 (VvARF7), and VvARF8 were monitored during inflorescence development in seeded diploid 'Tamnara' grapevines with or without GA application. Without GA application, VvIAA9, VvARF7, and VvARF8 were expressed at a relatively high level before full bloom, but decreased thereafter following pollination. After GA application at 14 days before full bloom (DBF); however, the expression levels of VvIAA9 and VvARF7 declined at 5 DBF prior to pollination. The effects of GA application on auxin levels or auxin signaling were also analyzed by monitoring the expression patterns of auxin biosynthesis genes and auxin-responsive genes with or without GA application. Transcription levels of the auxin biosynthesis genes Vitis anthranilate synthase β subunit (VvASB1-like), Vitis YUCCA2 (VvYUC2), and VvYUC6 were not significantly changed by GA application. However, the expressions of Vitis Gretchen Hagen3.2 (VvGH3.2) and VvGH3.3, auxin-responsive genes, were up-regulated from 2 DBF to full bloom with GA application. Furthermore, the Vitis GA signaling gene, VvDELLA was up-regulated by GA application during 12 DBF to 7 DBF, prior to down-regulation of VvIAA9 and VvARF7. These results suggest that VvIAA9 and VvARF7 are negative regulators of fruit set initiation in grapevines, and GA signaling is integrated with auxin signaling via VvDELLA during parthenocarpic fruit development in grapevines.
authors.affiliation: Fruit Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Suwon, Republic of Korea.
authors.forename: Chan Jin
authors.initials: CJ
authors.lastname: Jung
authors.affiliation: Fruit Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Suwon, Republic of Korea; Department of Plant Science, Seoul National University, Seoul, Republic of Korea.
authors.forename: Youn Young
authors.initials: YY
authors.lastname: Hur
authors.affiliation: Department of Life Sciences, The Catholic University of Korea, Bucheon, Republic of Korea.
authors.forename: Hee-Ju
authors.initials: HJ
authors.lastname: Yu
authors.affiliation: Fruit Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Suwon, Republic of Korea.
authors.forename: Jung-Ho
authors.initials: JH
authors.lastname: Noh
authors.affiliation: Fruit Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Suwon, Republic of Korea.
authors.forename: Kyo-Sun
authors.initials: KS
authors.lastname: Park
authors.affiliation: Department of Plant Science, Seoul National University, Seoul, Republic of Korea; Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea.
authors.forename: Hee Jae
authors.initials: HJ
authors.lastname: Lee
mesh_terms: D005638:Fruit / Q000187:drug effects* / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects / Q000235:genetics; D005875:Gibberellins / Q000494:pharmacology*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D027843:Vitis / Q000187:drug effects* / Q000378:metabolism*
chemical_list: D005875:Gibberellins; D010940:Plant Proteins
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