Search

BACKGROUND: The influence of foliar nitrogen fertilizer during veraison (FNFV) on anthocyanin accumulation and chromatic characteristics of 'Cabernet Sauvignon' grapes over two seasons was investigated. RESULTS: Urea and phenylalanine fertilizers (TU and TP, respectively) and a control were sprayed three times at veraison. In 2018, TU displayed a significant enhancement in total individual anthocyanin content and a* and Cab* profiles. In 2019, FNAV significantly improved the content of total non‐acylated, acylated anthocyanin and total individual anthocyanin, and the profiles of L*, a* and Cab*, except a* in TU. The whole process from phenylalanine variation to anthocyanin accumulation in grape skins was analyzed. On the whole, after the first FNFV to harvest, the increase in phenylalanine metabolism, abscisic acid content, effects of PAL (Phenylalanine ammonia lyase), UFGT (UDP glucose‐flavonoid 3‐O‐glucosyltransferase) and transcript concentrations of VvPAL and VvUFGT involved in anthocyanin biosynthesis were also strong evidence explaining the increased anthocyanin and chromatic profiles in 2019. CONCLUSION: Overall, FNFV for nitrogen‐deficient grapevines could significantly improve grape color, especially in the 2019 veraison with a proper climate. © 2021 Society of Chemical Industry. [ABSTRACT FROM AUTHOR]

Copyright of Hydrological Processes is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The cover image is based on the Original Article Enhancement of anthocyanin and chromatic profiles in cabernet sauvignon (Vitis vinifera L) by Xiangyu Sun et al., https://doi.org/10.1002/jsfa.11368. [ABSTRACT FROM AUTHOR]