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Article|12 Jul 2017|OPEN
A transcriptome analysis of two grapevine populations segregating for tendril phyllotaxy
Jie Arro1 , Jose Cuenca1 , Yingzhen Yang1 , Zhenchang Liang2 , Peter Cousins3 and Gan-Yuan Zhong,1 ,
1USDA-Agricultural Research Service, Grape Genetics Research Unit, Geneva, NY 14456, USA
2Beijing Key Laboratory of Grape Science and Enology and Key Laboratory of Plant Resource, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, People’s Republic of China
3E&J Gallo Winery, Modesto, CA 95353, USA
*Corresponding author. E-mail: GanYuan.Zhong@ars.usda.gov

Horticulture Research 4,
Article number: 32 (2017)
doi: https://doi.org/10.1038/hortres.2017.32
Views: 959

Received: 22 Mar 2017
Revised: 16 May 2017
Accepted: 07 Jun 2017
Published online: 12 Jul 2017

Abstract

The shoot structure of cultivated grapevine Vitis vinifera L. typically exhibits a three-node modular repetitive pattern, two sequential leaf-opposed tendrils followed by a tendril-free node. In this study, we investigated the molecular basis of this pattern by characterizing differentially expressed genes in 10 bulk samples of young tendril tissue from two grapevine populations showing segregation of mutant or wild-type shoot/tendril phyllotaxy. One population was the selfed progeny and the other one, an outcrossed progeny of a Vitis hybrid, ‘Roger’s Red’. We analyzed 13 375 expressed genes and carried out in-depth analyses of 324 of them, which were differentially expressed with a minimum of 1.5-fold changes between the mutant and wild-type bulk samples in both selfed and cross populations. A significant portion of these genes were direct cis-binding targets of 14 transcription factor families that were themselves differentially expressed. Network-based dependency analysis further revealed that most of the significantly rewired connections among the 10 most connected hub genes involved at least one transcription factor. TCP3 and MYB12, which were known important for plant-form development, were among these transcription factors. More importantly, TCP3 and MYB12 were found in this study to be involved in regulating the lignin gene PRX52, which is important to plant-form development. A further support evidence for the roles of TCP3-MYB12-PRX52 in contributing to tendril phyllotaxy was the findings of two other lignin-related genes uniquely expressed in the mutant phyllotaxy background.