Abstract
Global climate warming will significantly impact grapevine growth and development, and thus grape and wine industries worldwide. Heat-tolerant germplasms are very valuable for grapevine breeding programs. In this study, we assessed the thermotolerance of 247 wild grape accessions by chlorophyll fluorescence parameter (Fv/Fm) under critical high temperature according to Xu et al. in 2016, 2017, and 2018. The results showed that 36 grape accessions showed strong heat tolerance. Therefore, these accessions can be used as parents for breeding heat-tolerant grape cultivars.
Highlights
Global warming is predicted to cause an increase of 2–6 ◦C in ambient temperature by the end of the 21st century [1]
A total of 247 assessed grape accessions belonging to 28 different species were collected from Yunnan, Hubei, Hunan, Guangxi, Henan, and Shandong provinces in China (Supplementary Table S1), which were planted in the spring of 1998 in the Zhengzhou National Grape Germplasm Repository (ZNGGR) in Zhengzhou (38◦48 N, 113◦42 E; 114 m a.s.l.) in China
The Fv/Fm values were used to assess the level of heat tolerance of 247 wild grape accessions belonging to 28 species
Summary
Global warming is predicted to cause an increase of 2–6 ◦C in ambient temperature by the end of the 21st century [1]. This increase in temperature could be a rate-limiting factor affecting plant growth and development [2]. Grapevine is a globally important fruit crop [3]. Grapevine growth and development are relatively sensitive to high temperature [4], as berry ripening and yield are strongly affected if air temperature exceeds 35 ◦C [5]. The significant impact of high temperature on viticulture has been shown previously [6]
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