“…Because high air temperatures lead to poor-color grape berries Kobayashi et al, 1967;Kliewer, 1970;Downey et al, 2006;Shinomiya et al, 2015 , an increase in the frequency of 'Kyoho' and 'Pione' grape berries with poor color has been recently observed by many grape famers in Japan Sugiura et al, 2012Sugiura et al, , 2017 . Poor skin color of black-skinned table grapes is known as "red ripening", and such grapes have low commercial value Kobayashi et al, 1965;Koshita et al, 2011 . Therefore, superior-color grape cultivars with high anthocyanin content in the skin, such as 'Suzuka ' Shinomiya et al, 2017;Shiraishi et al, 2018 and'Grosz Krone' Sato et al, 2018 , have been bred in recent years.…”