Relationship between endodormancy, FLOWERING LOCUS T and cell cycle genes in Vitis vinifera

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• 作者：Ricardo Vergara ; Ximena Noriega ; Francisca Parada ; Débora Dantas…
• 关键词：Apex ; Buds ; Dormancy ; Grapevines
• 刊名：Planta
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：243
• 期：2
• 页码：411-419
• 全文大小：988 KB
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• 作者单位：Ricardo Vergara (1) (2)
  Ximena Noriega (1)
  Francisca Parada (1)
  Débora Dantas (3)
  Francisco J. Pérez (1)
  
  1. Facultad de Ciencias, Laboratorio de Bioquímica Vegetal, Universidad de Chile, Casilla 653, Santiago, Chile
  2. Programa Doctorado en Ciencias Silvoagropecuarias y Veterinarias, Universidad de Chile, Santiago, Chile
  3. Centro de Ciencias e Tecnologías Agropecuarias, Universidade Estadual do Norte Fluminense, Avda Alberto Lamego 2000, Campos Dos Goytacazes, RJ, Brazil
  
• 刊物主题：Plant Sciences; Agriculture; Ecology; Forestry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-2048

文摘

Main conclusion In grapevines, the increased expression of VvFT , genes involved in the photoperiodic control of seasonal growth ( VvAP1, VvAIL2 ) and cell cycle genes ( VvCDKA, VvCDKB2, VvCYCA1, VvCYCB, VvCYCD3.2 ) in the shoot apex relative to the latent bud, suggests a high mitotic activity of the apex which could prevent them to enter into endodormancy. Additionally, the up-regulation of these genes by the dormancy-breaking compound hydrogen cyanamide (H ₂ CN ₂ ) strongly suggests that VvFT plays a key role in regulating transcriptionally cell cycle genes. At the end of the growing season, short-day (SD) photoperiod induces the transition of latent grapevine buds (Vitis vinifera L) from paradormancy (PD) to endodormancy (ED), which allows them to survive the cold temperatures of winter. Meanwhile, the shoot apex gradually decreases its growth without entering into ED, and as a result of the fall of temperatures at the beginning of autumn, dies. To understand developmental differences and contrasting responses to environmental cues between both organs, the expression of cell cycle genes, and of genes involved in photoperiodic control of seasonal growth in trees, such as FLOWERING LOCUS T (FT), APETALA1 (AP1) and AINTEGUMENTA-like (AIL) was analyzed at the shoot apex and latent buds of vines during the transition from PD to ED. After shift to SD photoperiod, increased expression of cell cycle genes in the shoot apex suggests a high mitotic activity in this organ which could prevent them from entering into ED. Additionally, the increased expression of VvFT, VvAP1and VvAIL2 in the shoot apex, and the up-regulation of VvFT, VvAP1and cell cycle genes VvCDKA, VvCDKB2, VvCYCA.1, by the dormancy-breaking compound hydrogen cyanamide (H₂CN₂), strongly suggests that VvFT plays a key role in regulating transcriptionally cell cycle genes, giving thus, more support to the model for photoperiodic control of seasonal growth in trees. Furthermore, downregulation of VvFT by the SD photoperiod detected in leaves and buds of grapevines highlights the importance of VvFT in the induction of growth cessation and in ED development, probably by regulating the expression of cell cycle genes.