Effect of methyl jasmonate, abscisic acid spraying on improving coloration and quality of flame seedless under Upper Egypt climate

Abstract

Fruit color development in table grapes growth and fruiting are affected by hot weather mainly in warm regions. Here, 2-year field study, during 2017/2018 and 2018/2019 seasons in a factorial experiment in randomized complete block design were conducted to study the effects of some of tested materials and time/stage of spraying on Flame Seedless grapevines grown in Upper Egypt and harvested during 15 th May to 10 th June. In this time, global and domestic markets of table grape are affected by quality of fruits focusing color in colored varieties. Thus, prices decrease considerably in the market. On other contrary, harvesting early (before mid of May) leads to at least a 50% increase in the total income. In this experiment methyl jasmonate and ABA are used at verasion stage followed by ethephon one time compared to spraying ethephon twice. all tested treatments are sprayed at different time/stages at 25 and 50 % colored bunched and the findings did not affect significantly on the yield components while using ABA or methyl jasmonate followed by ethephon one time improved berry quality in terms of berry color and firmness compared by spraying ethephon twice , on the other hand using methyl jasmonate and ABA affect significantly on reducing the uncolored and the best results were when spraying at 95 % berry softening approximately and 50% bunch coloring especially the methyl jasmonate. It could be recommended to use methyl jasmonate followed ethephon at 50% bunch coloring to improve berry and more coloring and keeping the berry quality after harvesting.

Enhancing Berry Quality and Coloration of King Ruby Grapes by Some Preharvest Treatments

“…Jasmonic acid is a kind of plant growth regulators which plays an important role in regulating plant stress response, plant growth, development and fruit ripening (Khan and Singh, 2007;Aubert et al, 2015). Using methyl jasmonate at 50% bunch coloring of "Flame seedless" improving berry coloring and keeping the berry quality after harvesting (Salem, 2019). Foliar application of Jasmonic acid on "Flame seedless" at 10% berry coloration increased berry TSS, and anthocyanin contents (Samy, 2021).…”