The results of 1997 and 1998 seasons revealed that increasing the storage period of Early Grand peach markedly increased weight loss, percentage of decay, total soluble solids, total soluble pectin, carotene and anthocyanin, and decreased juice acidity, vitamin C, total phenols, total chlorophyll and fruit firmness.It was also found that using ethrel as one of the three chemical thinners caused an increase in weight loss, fruit decay percentage, total soluble solids, total soluble pectin, carotene and anthocyanin and decrease in juice acidity, fruit firmness, total phenols and total chlorophyll.In the meantime, both GA3, and urea thinning treatments caused a slight decrease in weight loss, decay percentage. No constant trend was found in juice acidity, while an increase in chlorophyll. No effect was found for both thinners on total phenols, carotene and anthocyanin during the storage time.
The present investigation was conducted during 1997 and 1998 seasons to study the effect of potassium and phenylalanine foliar sprays on Pairi mango trees. The experimental results revealed that fruit yield, expressed as kg/tree or fruit number per tree, generally, increased as the levels of potassium increased. The best results in this respect were obtained by using 3% K2O. In the meantime, results showed that phenylalanine did not affect the number of fruits per tree, but significantly increased the yield as kg per tree. In both years of study, peel total chlorophyll, generally, decreased, while carotene and anthocyanin increased by the foliar application of both K2O and phenylalanine.Both potassium and phenylalanine foliar applications did not influence mango fruit firmness.Results also revealed that potassium and phenylalanine treatments caused an increase in reducing, non-reducing and total sugars on one hand, and reduction in starch on the other.Spraying Pairi mango trees with both potassium and phenylalanine increased total soluble solids and vitamin C. As for fruit acidity, potassium caused an increase in fruit juice acidity, while phenylalanine seemed not to affect fruit juice acidity.
The present study of 1997 and 1998 seasons was conducted to investigate the influence of preharvest potassium and phenylalanine foliar sprays on Pairi mango fruit characteristics during cold storage at 10 o C and relative humidity of 85-90%.Results indicated that potassium and phenylalanine treatments caused a reduction in weight loss, while the percentage of fruit decay and fruit firmness, generally, were not affected by all treatments. In the meantime, all treatments caused an increase in total soluble solids, sugar fractions and reduction in fruit starch.Results, also, revealed that potassium treatments increased juice acidity, while phenylalanine fioliar application alone did not influence juice acidity during the cold storage.In both years of study, results revealed that both potassium and phenylalanine caused a decrease in peel total chlorophyll and general increase in both carotene and anthocyanine.Regarding the effect of storage time, results showed an increase in the percentage of weight loss, fruit decay, total soluble solids, sugar fractions and carotene and anthocyanin. On the contrary, reduction in fruit starch content, juice acidity and destruction in peel chlorophyll occurred as the storage period advanced.
The results of the two successive seasons of 1997 and 1998 revealed that chemical thinning with gibberellic acid (GA3), urea at pre-bloom stage and ethrel at post-bloom stage of Early Grand peach trees significantly reduced yield but increased fruit weight.In general, the three thinning treatments significantly increased both total soluble solids and vitamin "C". As for juice acidity, it was increased by GA3, decreased by ethrel and was not affected by urea treatments.As for fruit firmness, data showed that ethrel reduced firmness in the meanwhile, it increased total soluble pectin. On the other hand, both GA3 and urea treatments produced firmer fruits as a result of reducing the total soluble pectin significantly.It was also found that total chlorophyll was significantly decreased with ethrel treatments and increased with both GA3 and urea treatments. In addition, carotene and anthocyanin were increased by ethrel and were not affected by both GA3 and urea treatments.Data of the present study showed that chemical thinning caused a general increase in total sugars, while total phenols were affected by ethrel only.
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