Effect of Tryptophan, Proline and Tyrosine on Vegetative Growth, Yield and Fruit Quality of Red Roumy grapevines

Abstract

T HIS study was achieved out during two successive seasons (2018 & 2019) on 12 yearold Red Roumy grapevines. The chosen vines were grown in a clay soil under surface irrigation system in a private vineyard at El-deer hamlet, Aga, Dakahlia region, Egypt. Three amino acids namely tryptophan, proline and tyrosine were used as foliar application at rate 100 and 200 ppm on the vines for three times, at vegetative growth start, at full bloom stage and at verison stage. Results appeared that using tryptophan, proline and tyrosine were effective in improving shoot length, leaf area, total chlorophyll and total amino acids in the leaves in addition percentages of N, P, K and Mg in the leaves as well as enhanced yield per vine, cluster weight, berry weight, berry set, SSC content, total sugars, total anthocyanin and total phenols, also enhanced pruning wood weight, ripening wood, internode length and thickness while reduced titratable acidity in berries as compared with control in two seasons. Application of tryptophan at 200 ppm and tyrosine at 200 ppm gave the significant highest of vegetative growth parameters, yield and its components. While, proline at 200 ppm increased SSC% and SSC acid ratio, total anthocyanin, total phenols and total sugars while these reduced titratable acidity. The best net profit of Red Roumy grapevines was obtained with tryptophan at 200 ppm.

Enhancement of the Quality of Balady Mandarin (Citrus reticulate) Fruit Using L-Proline

“…Caronia et al (2010) demonstrated that application of L-proline on Tarocco Scire trees caused an increment in TSS percentage. The total soluble solids were statistically affected by all L-proline treatments by boosting photosynthesis and chlorophyll, in agreement with the results by El Sayed et al (2014), Mahmoudi et al (2014), andEl Kenawy (2022).…”

“…During the 2020 season, L-proline at 200 µg/ml procured the highest total sugar percentage (8.29), compared to (4.40) for the control treatment. These results are generally in line with those attained by Takeuchi et al (2008), El Sayed et al (2014, Mahmoudi et al (2014), andEl Kenawy (2022). They reported that the total sugars of fruit juice were increased by spraying L-proline, which hydrolyzed polysaccharides such as starch into fruit-reducing sugars such as fructose and glucose.…”

“…Otherwise, the 200 µg/ml L-proline treatment attained the highest significant fruit weight value, with an increment of 21.15% over the control in the 2020 season. The similar influences were noticed by Chun et al (2009), Caronia et al (2010), Mahmoudi et al (2013), El Sayed et al (2014), and El Kenawy (2022. They concluded that spraying L-proline improved the fruit weight by activating some hormones such as cytokinin and auxin.…”

“…Numerous previous research studies have noticed that L-proline application has a significant influence on the yield and fruit quality of many fruit crops (Takeuchi et al, 2008;Caronia et al, 2010;Mahmoudi et al, 2013;El-Sayed et al, 2014;Mahmoudi et al, 2014 andEl-Kenawy, 2022). The increment in fruit quality may be due to enhancing the uptake of certain mineral nutrients and reducing the uptake of some essential toxic elements (El-Kosary et al, 2011).…”

Effect of proline and fruit bagging on the coloration of Aril and peel of “Wonderful” pomegranates

“…7 It was reported that proline at 200 ppm caused an increase of total anthocyanin of Red Roumy grapes while reduced titratable acidity. 8 It was reported that proline plays a main role in preserving the osmotic balance, stabilizing the structure of enzyme and membranes in key proteins. In addition to, Protecting the photosynthetic products and scavenging free radicals.…”