Genetic and Geographic Variation in Seed Traits of Common Walnut (Juglans Regia L.) Among Twenty Populations From the West of Spain

Contreras-Díaz, Roberto; Alonso, Esteban; Fernádez-López, J.

doi:10.17660/actahortic.2005.705.15

Cited by 6 publications

(6 citation statements)

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“…Kyrgyz walnut kernel proportions were higher or equal to wild Moldavian and Romanian cultivars [36,37]. Even though genotype has a strong effect on walnut properties, Roor et al [5] found walnut density correlating with altitude, latitude and longitude and Diaz et al [18] reported phenotypic variation of Spanish walnut cultivars due to latitude designating light and climatic conditions. Consequently, future studies need to consider the interactive effects of genotype and environmental factors, such as seasonality, temperature range or water availability [10].…”

Section: Discussionmentioning

confidence: 99%

“…Next to differences in temperature also precipitation and other site factors can affect the antioxidant capacity of walnuts [17]. Furthermore, physical nut parameters, such as shell hardness changed with altitude and latitude due to altered light and temperature conditions [5,16,18]. Also, water availability has been observed to affect physical walnut and kernel properties [19], even though genetic variability causes large differences as well [6], leaving the question if genotype or environmental factors stronger influence walnut quality unanswered [10].…”

Section: Introductionmentioning

confidence: 99%

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Intraspecific variability overlays abiotic site effects on some quality parameters of walnut (Juglans regia L.) fruits from Kyrgyzstan

Meisen

Smanalieva

Oskonbaeva

et al. 2020

Eur Food Res Technol

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Kyrgyz walnut-fruit forests harbour a unique walnut diversity, which has rarely been investigated concerning nut properties and the influence of environmental conditions on these. We evaluated the influence of soil properties and altitude on physical and some chemical walnut properties at three sampling sites differing in altitude by 200 m. Walnut samples were collected from 15 randomly chosen trees. Soil samples from two depths under each tree were analysed for plant available mineral nutrients and soil chemical properties. In contrast to our hypothesis, physical nut and chemical kernel quality parameters did not differ between sampling sites at different altitude and were not affected by soil properties. Only pH showed a relationship with manganese availability in soil and kernel content, and was related to amino acid content of kernels. Tree and site-specific variability overrides abiotic influence caused by different altitude or soil properties and reflect the high genetic variability in these forests.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intraspecific variability overlays abiotic site effects on some quality parameters of walnut (Juglans regia L.) fruits from Kyrgyzstan

Meisen

Smanalieva

Oskonbaeva

et al. 2020

Eur Food Res Technol

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“…Third, reproduce by seeds of this species causes a very important genetic variability that appears at the flowering period for pomological characters, vigor of the tree and type of fructification, which allowed each geographic region to maintain a diverse population (Lansari et al, 2001). Besides, Diaz et al (2005) stated that the geographic location and the growing conditions affect fruit and kernel traits of walnut populations from western Spain.…”

Section: Discussionmentioning

confidence: 99%

Morphological and Pomological Variability Analysis of Walnut (Juglans regia L.) Genetic Resources from the Middle and High Atlas of Morocco

Kabiri

Bouda

Elhansali

et al. 2018

AJB

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The walnut (Juglans regia L.) is a traditional fruit crop in Morocco. This species is cultivated in mountain in different environments. However, little data is available on its genetic diversity and its adaptability. Morphological characters of leaf and fruit from 11 Moroccan accessions of walnut were used to assess phenotypic variation of this species. Significant differences were found between accessions for the most examined traits, indicating a high phenotypic diversity. Multivariate analyses lead to identify three groups of accessions. The first group composed by the accessions of both Middle and High Atlas Mountain with high weigh and percentage of kernel and low thickness of shell. The second group included the accessions for the High Atlas Mountain characterised by large leaf, high nut dimension and great nut size. The third group is composed by two accessions, one belongs to the Middle Atlas Mountain and the other originating from High Atlas Mountain, which are characterized by small leaf and nut. Then, the structuration of accessions in three groups was not correlated to the mountain range type. Moreover, this study showed a significant phenotypic heterogeneity between the eleven studied accessions which opens the way for the strategies for their conservation and the selection of efficient genotypes with the desired traits.

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“…Díaz et al 27 reported geographic variation for some fruit morphological traits of walnuts from populations of western Spain. The most important pattern of geographic variation was due to latitude.…”

Section: Walnut Fruit Characteristicsmentioning

confidence: 99%

Walnut (Juglans regia L.): genetic resources, chemistry, by-products

Martínez

Labuckas

Lamarque

et al. 2010

J. Sci. Food Agric.

196

190

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Walnut (Juglans regia L.) is the most widespread tree nut in the world. There is a great diversity of genotypes differing in forestry, productivity, physical and chemical nut traits. Some of them have been evaluated as promising and may serve as germplasm sources for breeding. The nutritional importance of the nut is related to the seed (kernel). It is a nutrient-dense food mainly owing to its oil content (up to 740 g kg(-1) in some commercial varieties), which can be extracted easily by screw pressing and consumed without refining. Walnut oil composition is dominated largely by unsaturated fatty acids (mainly linoleic together with lesser amounts of oleic and linolenic acids). Minor components of walnut oil include tocopherols, phospholipids, sphingolipids, sterols, hydrocarbons and volatile compounds. Phenolic compounds, present at high levels in the seed coat but poorly extracted with the oil, have been extensively characterised and found to possess strong antioxidant properties. The oil extraction residue is rich in proteins (unusually high in arginine, glutamic and aspartic acids) and has been employed in the formulation of various functional food products. This review describes current scientific knowledge concerning walnut genetic resources and composition as well as by-product obtainment and characteristics.

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Genetic and Geographic Variation in Seed Traits of Common Walnut (Juglans Regia L.) Among Twenty Populations From the West of Spain

Cited by 6 publications

References 0 publications

Intraspecific variability overlays abiotic site effects on some quality parameters of walnut (Juglans regia L.) fruits from Kyrgyzstan

Intraspecific variability overlays abiotic site effects on some quality parameters of walnut (Juglans regia L.) fruits from Kyrgyzstan

Morphological and Pomological Variability Analysis of Walnut (Juglans regia L.) Genetic Resources from the Middle and High Atlas of Morocco

Walnut (Juglans regia L.): genetic resources, chemistry, by-products

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