S. Faraji; M. Hadadinejad; V. Abdoosi; T. Basaki; S. Karami
Abstract
In order to study the effects of drought stress on polyphenolic compounds of pomegranate juice (Punica granatum L.) (total phenol, total flavonoid and cyanidin 3-glocoside content) as well as fruit yield, an experiment was carried out as split plot based on a randomized complete block design with ...
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In order to study the effects of drought stress on polyphenolic compounds of pomegranate juice (Punica granatum L.) (total phenol, total flavonoid and cyanidin 3-glocoside content) as well as fruit yield, an experiment was carried out as split plot based on a randomized complete block design with three replications (irrigation levels in main plots and pomegranate genotypes in subplots). Results showed that drought stress increased the content of juice polyphenolic compounds (P <0.05) and decreased fruit yield (P <0.05) in comparison with non-stress conditions (75±5% FC). However, mild stress (55±5% FC) caused a lower yield loss (P <0.05) compared to severe stress (35±5% FC). The results also showed that the genotypes studied could be considered as a rich source of phenolic compounds; however, the highest difference among the genotypes was found for cyanidin 3-glocoside content at different irrigation levels. On the other hand, based on the principal component analysis, under non-stress and mild stress conditions, genotypes Agha Mohamad Ali (AMA), Pust Sefid Torsh (PST), Malas Torshe Saveh (MTS), and Malas Shirine Saveh (MSS) could be recommended in food and pharmaceutical industries as superior and natural antioxidant-rich genotypes due to the high fruit yield and polyphenolic compounds. Generally, because of the importance of yield potential under drought stress, the mild drought stress treatment (55±5% FC) could be introduced as the optimum condition to obtain acceptable level of secondary metabolites, particularly cyanidin 3-glocoside, and fruit yield in Saveh region.
S. Karami; M.R. Sabzalian; M. Rahimmalek; Gh. Saeidi; L. Khodaee
Abstract
In order to investigate the possible influence of seasonal variation on the percentage of seed oil and total phenolic content in seeds and leaf of safflower, three populations (19 accessions) including 6 cultivars of cultivated species (Carthamus tinctorius), 4 genotypes of wild species (C. oxyacanthus) ...
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In order to investigate the possible influence of seasonal variation on the percentage of seed oil and total phenolic content in seeds and leaf of safflower, three populations (19 accessions) including 6 cultivars of cultivated species (Carthamus tinctorius), 4 genotypes of wild species (C. oxyacanthus) and 9 genotypes of F5 generation derived from inter-specific cross (C. tinctorius× C. oxyacanthus) in two sowing dates, were evaluated. The results showed the effect of planting dates was significant on the percentage of seed oil and total phenolic content of seeds (p<0.01), except for leaf phenolic content. The percentage of seed oil and total phenolic content of seeds was higher in summer and spring planting dates, respectively. Also, in both planting dates, populations of cultivated and wild species had higher and lower percentage of seed oil, respectively. Whereas, percentage of seed oil in the populations derived from inter-specific cross was intermediate between cultivated and wild species, some genotypes in these populations had high percentage of seed oil and were in the range of percentage of seed oil observed for cultivated genotypes. Also, the total phenolic content of seeds in the genotypes with colored seed coat (black-seeded genotypes derived from the cross and wild genotypes) was higher comparing with white seed coat genotypes (cultivars and white-seeded genotypes derived from interspecific cross), then it seems that not only planting dates but also seed coat and genetic purity of loci controlling seed coat color may affect total phenolic content of seeds. In general, results of this experiment indicated that there is possibility of improving seed oil percentage and total phenolic content of seeds as the two factors with medicinal properties in Carthamus spp. using variation in planting dates and also inter-specific crosses. Furthermore, safflowerleaf is a rich source in total phenolics in comparison with seed and can be used in pharmaceutical industries.