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Jan-March, 2020


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Air Pollution Effects on Vegetative Growth, Fruit Quality and Mineral Composition of Washington Navel Orange

Hala M. El-Khayat and Gehan R. Zaki

ABSTRACT: The present study was conducted during 2017 and 2018 seasons to investigate the effect of air pollution on vegetative growth, fruit quality and mineral composition of seventeen years old Washington navel orange (Citrus sinensis) budded on sour orange and growing in a private orchard located at El-Tarh, Behera governorate, Egypt . Four sites (250, 500, 750, 1000m) apart from Abou Keer Electricity company and a control site in Zahara Kafr ELdoar at a distance more than 35 km were selected . The data for air analysis indicated that control site gave the lowest NO2, O3, TSP (Total suspended particles), Pb, Ni, Cd and Cr whereas site one gave the highest values. Also, results showed that plants in control site gave significantly higher canopy, height and trunk increment, Leaf area, vitamin C, total soluble solid, acidity, juice Volume, reduced sugar, non reduced sugar, total sugar, fruit diameter and fruit number, fruit and leaf nitrogen, phosphorus, potassium, leaf total chlorophyll and protein content and the lowest heavy metals content (chromium, nickel, cadmium and lead) in leaf and fruit than other sites. As well as these parameters increased by increasing the distance from the pollutant source whereas heavy metals decreased. Fore thus, it can be recommended to avoid adhesive plantings less than 0–1000 m distances from the pollutant source due to heavy metals contamination in order in order to preserve both agriculture and environment.

[ FULL TEXT PDF 1-13 ] DOI: 10.36632/ije/2020.9.1.1

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Genetic Diversity of Egyptian Barley Cultivars for Water Stress using SSR Markers

Samah A. Mariey, Mona A.M. El-Mansoury, Amin M.E Agwa and Mary E. Nashed

ABSTRACT: Abiotic stresses in particular water stress which was considered important stress that affecting all crops in all the world and Egypt. The aim of the present work was to evaluate the performance of 15 Egyptian barley cultivars and find out the genetic diversity of these cultivars for water stress tolerance using simple sequence repeats (SSR) during two consecutive seasons to detect their tolerance to water stress. Results revealed that the Egyptian barley Giza 126, Giza 131 and Giza 2000 were considered as tolerant cultivars, which they exhibited the highest mean values for all studied morphological and physiological traits. Twenty alleles were produced as a result of fingerprinting ten SSR primers ranging from one to four alleles per locus with a mean value of 2.0 alleles per locus .The PIC (Polymorphism Information Content) value of each SSR marker ranged from 0.23 ( HvM67) to 0.58 (EBmac 624) with an average value of 0.227. Un-weighted Pair-Group Method with Arithmetic (UPGMA) cluster analysis of the similarity data grouped all the fifteen studied Egyptian cultivars into two major groups divided according to their response to water stress tolerance; first group include all the water stress tolerant cultivars and moderately tolerant in two closely related clusters, while all the sensitive genotypes and moderate cultivars in the other group were closely related in two clusters. These results proposed that SSR markers are professional and detective tool for assessment of genetic diversity and relatedness as well as distinguishing the Egyptian barley cultivars for water stress tolerance to use them in breeding program.

[ FULL TEXT PDF 14-25 ] DOI: 10.36632/ije/2020.9.1.2

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