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Juglans regia L. tree plantations for wood production in mining area of S. Barbara (AR). Evaluation of N-fixing accessory trees effect
Tani A,Maltoni A,Mariotti B,Buresti Lattes E
Forest@ , 2006,
Abstract: The study was carried out in experimental plots located in the Arno valley (Cavriglia, province of Arezzo - Italy). The experimental plots, walnut (Juglans regia L.) plantations both pure and mixed to accessory trees (Alnus cordata Loisel., Corylus avellana L., Eleagnus angustifolia L. and Robinia pseudoacacia L.), were established in 1986 and 1989. Data on grown and architectural characteristics were collected in different periods on trees aged 9, 13 and 16. Walnut trees grown with accessory trees showed the best performances, especially if associated with N-fixing species. These positive effects are probably due to many co-occuring favourable causes, a remarkable aspect of which is the higher availability of N. To better investigate the above effect, N concentration in the soil and in walnut leaves was measured in plantations both pure and mixed with Italian alder (Alnus cordata) or black locust (Robinia pseudoacacia), and N concentration values were compared with growth characteristics. The results showed that Juglans regia trees associated with Italian alder grow faster, with straighter stems and better stem shapes for qualified wood production. Even if walnut trees growing in plantations with black locust show similar N concentration values, growth performances are worse.
Two new glucosides from the pellicle of the walnut (Juglans regia)
Le Cai,Chuan-Shui Liu,Xiao-Wei Fu,Xiao-Jing Shen,Tian-Peng Yin,Ya-Bin Yang,Zhong-Tao Ding
Natural Products and Bioprospecting , 2012, DOI: 10.1007/s13659-012-0009-0
Abstract: A new α-tetralonyl glucoside, 6′-O-acetyl-juglanoside E (1), and a new dihydrophaseic acid glucoside, dihydrophaseic acid 1-O-(6-O-acetyl)-glucopyranoside (2), together with two known ones, juglanoside E (3) and dihydrophaseic acid (4), were isolated from the pellicle of the walnut (Juglans regia). The structures of the new compounds were elucidated by comprehensive spectroscopic analysis, including IR, HRESIMS, 1D and 2D NMR data.
REQUIREMENTS OF WALNUT TREE (JUGLANS REGIA) TO ENVIRONMENTAL FACTORS. EVALUATION OF LANDS FOR CULTURE OF WALNUT WITH EXAMPLES IN THE CURVATURE SUBCARPATHIANS HILLS  [cached]
Cristinel Putinica
Soil Forming Factors and Processes from the Temperate Zone , 2012,
Abstract: Walnut tree (Juglans regia) is one of the cultivated tree species that was known and cultivated for a long time. The paper presents the optimum conditions for walnut growth, and attempts to elaborate qualityevaluation criteria, according to the Romanian system of land quality classification for different crops. Quality scores are attributed according to the specific landscape conditions. The system is evaluated with the help of three case studies.
Determination of Apomictic Fruit Set Ratio in Several Romanian Walnut (Juglans regia L.) Cultivars  [cached]
Sina COSMULESCU,Mihai BOTU,Gheorghe ACHIM
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2012,
Abstract: Apomixis, a natural process that allows clonal propagation by seed, is an important feature of walnut (Juglans regia L.). This study was carried out to determine the ability of apomictic fruit setting in twelve Romanian walnut cultivars. ‘Sibisel 44’, ‘Geoagiu 65’, ‘Germisara’, ‘Muscelean’, ‘Sarmis’, ‘Valcor’, ‘Valmit’, ‘Valrex’, ‘Jupanesti’, ‘Velnita’, ‘Orastie’ and ‘Argesean’ cultivars were used in the experiment. Female flowers were isolated with pergament paper bags and the apomictic fruit set was determined 8 weeks after anthesis. The apomixis degree was determined as the number of fruit calculated in relation to the number of isolated flowers. The percentage of apomictic fruit set without pollination in cultivars analyzed is low, ranging from 7.86% (‘Orastie’ cultivar) up to 12.46% (‘Jupanesti’ cultivar). The results indicated that apomictic fruit set is insufficient for economical seed and crop production in these Romanian walnut cultivars.
Effect of Integrated Nutrient Management on Leaf Nutrient Status of Walnut (Juglans regia L.)  [PDF]
B. P. Bhattarai,C. S. Tomar
Nepal Journal of Science and Technology , 2009, DOI: 10.3126/njst.v10i0.2825
Abstract: The study was conducted at 10 - years- old walnut orchard at Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni-Solan(H.P.) to find out the effect of integrated nutrient management on leaf nutrient status of walnut ( Juglans regia L.). There were 13 different treatment combinations of organic and inorganic fertilizers. Treatments were applied on per tree basis. Among the treatments recommended dose of NPK +50kg vermicompost and three fourth recommended dose of NPK+68.75kg vermicompost were effective for improvement of leaf nutrient status. Key words: NPK; Neem cake; Vermicompost; Leaf nutrient DOI: 10.3126/njst.v10i0.2825 Nepal Journal of Science and Technology Volume 10, 2009 December Page: 63-67 ? ?
Effect of Culture Medium in Callogenesis from Adult Walnut Leaves (Juglans regia L.)
Avilés,Fabiola; Ríos,Darcy; González,Ricardo; Sánchez-Olate,Manuel;
Chilean journal of agricultural research , 2009, DOI: 10.4067/S0718-58392009000300020
Abstract: to define preliminary aspects of walnut (juglans regia l.) callogenesis in indirect propagation systems, this work analyzed callogenic induction in adult leaves of walnut in broadleaf trees (btm), murashige and skoog (ms) driver kuniyuki walnut (dkw) and woody plant (wpm) media. leaf segments of 1 cm2, previously sterilized, were placed in each culture medium, supplemented with 21.4 μm naphtalene acetic acid (naa) and 8.8 μm 6-benzylaminopurine (bap). a completely random design was used; the experimental unit was a petri dish with six callus explants. each treatment was composed of seven petri dishes. callogenesis (%), nodular calli (%) and histology of calli explants were evaluated at 4 weeks by staining 10 μm slices with safranine-fastgreen. there were no significant differences (α = 0.05) in callogenesis among evaluated media; but nodular calli percentages were significantly higher in btm (75%) and wpm (63%). only in calli obtained in the btm medium did the histology show the presence of meristematic zones, but without external expression. these results indicate that the medium influences the morphogenic characteristics of resultant callus. calli produced in btm presented better morphogenic potential, with meristems at primary stages of organization.
Occurrence of Shallow Bark Canker of Walnut (Juglans regia) in Southern Provinces of Iran  [PDF]
F. Yousefikopaei,S.M. Taghavi,Z. Banihashemi
Pakistan Journal of Biological Sciences , 2007,
Abstract: From April 2001 to November 2002, samples of walnut branches and trunks with symptoms of shallow bark canker were collected from Fars and Kohgiluyeh-va-Boyerahmad provinces. Symptoms of the disease were small cracks in the bark of the trunk and scaffold branches of mature trees with dark watery exudates which stained the affected trunk or limb. By removal of phelloderm, extensive necrosis of the underlying tissues was observed. In some cases, necrosis extended to cambium and outer xylem. Sixty-one strains of a bacterium were isolated from infected tissues using EMB and YDC media. On the basis of standard biochemical and physiological tests the bacterium was identified as Brenneria nigrifluens. The pathogen was found to be wide-spread in the provinces. Isolates were compared by physiological and biochemical characters, antibiotic sensitivity and protein electrophoretic pattern. Most of the strains were fairly similar in phenotypic features and electrophoretic profiles of whole-cell proteins were similar to each other and to reference strain (B. nigrifluens 5D313). Inoculation of 1-2 years-old walnut seedlings in May and June produced blackening symptoms and the bacterium survived for long period in infected tissues. This is the first report of the shallow bark canker of walnut in southern Iran.
Fatty acid composition of some walnut ( Juglans regia L. ) cultivars from east Anatolia
Dogan, Mahmut,Akgul, Attila
Grasas y Aceites , 2005,
Abstract: In this study, the fatty acid composition of different walnut (Juglans regia L.) cultivars grown in Adilcevaz in east Anatolia was determined. The total oil content of the walnuts ranged from 65.00 ± 0.06 to 70.00 ± 0.58 %. The oleic acid content of the oils ranged from 22.63 to 27.27 % of the total fatty acids while the linoleic acid and linolenic contents ranged from 49.93 to 54.41 % and 14.32 to 17.82 % respectively. The palmitic acid content of the walnuts ranged from 5.61 % to 5.82 % while there was a trace amount of miristic acid (<0.1 %) in the samples. Finally, the fatty acid results indicated that walnut cultivars from east Anatolia were distinctive in terms of their linolenic acid profile. These results might be significant for selection studies in order to better identify walnut varieties for healthy diets. En este estudio se ha determinado la composición en ácidos grasos de diferentes cultivos de nueces ( Juglans regia L.) producidos en Adilcevaz en el Este de Anatolia. El contenido de aceite total de las nueces osciló entre 65.00 ± 0.06 y 70.00 ± 0.58 %. El contenido en ácido oleico varió desde 22.63 a 27.27 % respecto a los ácidos grasos totales mientras que los contenidos en ácido linoleico y linolénico variaron desde 49.93 hasta 54.41 % y desde 14.32 hasta 17.82 % respectivamente. El contenido en ácido palmítico de las muestras de nueces estuvo comprendido entre 5.61 y 5.82 % mientras que de ácido miristico solo se encontraron trazas ( < 0.1 %). Finalmente, los resultados de los ácidos grasos indicaron que los cultivos de nueces del Este de Anatolia son distintos en cuanto a su perfil de ácido linolenico. Estos resultados pueden ser significativos para estudios de selección en orden a identificar mejor las variedades de nueces para dietas saludables.
RELATIONSHIPS BETWEEN GRAFT SUCCESS AND CLIMATIC VALUES IN WALNUT (JUGLANS REGIA L.)  [PDF]
T Karadeniz
Journal of Central European Agriculture , 2006,
Abstract: The study determines the graft take of walnut in Ordu province located in the East Black Sea Region. Grafting studies were carried out in nursery conditions in late August from 1993 to 2000. During these years, a total of 87 264 applied grafts were evaluated by using patch-grafting method. The graft take varied from 29% to 64 % depending on years. Relations between the graft take and climate conditions were also considered. Graft take under nursery conditions was affected by especially relative moisture (%) in addition to the mean and maximum temperature (°C) in August and September months.
Genetic variation of common walnut (Juglans regia) in Piedmont, Northwestern Italy
Ferrazzini D,Monteleone I,Lecce F,Belletti P
Forest@ , 2007, DOI: -
Abstract: The European or common walnut is a large tree prized as a multipurpose species: it provides valuable timber and produces a high-quality edible nut. The diffusion of the species in Italy has been largely influenced by the human activity, mainly through germplasm movement, selection of genotypes most suited for wood or fruit production and adaptation induced on fruit crop reproductive materials. As a consequence, genetic variability has been reduced, so that programs aimed at its preservation appear of the utmost importance. 104 walnut plants growing in Piedmont, northwestern Italy, were investigated through genetic variation scored at RAPD loci, yielded by PCR amplification of 10 decamer primers. Among the 101 studied loci, only 53 were polymorphic, showing a low level of genetic variation within the studied material. Genetic differentiation was estimated both at individual and geographical area level. Only in few cases trees growing in the same area showed to be genetically similar, while the differentiation between areas accounted for about 10% of the total variation, according to AMOVA. No significant correlation was found between genetic and geographic distances. The results of the study showed that also in Piedmont (such as it was already demonstrated in other parts of Italy) the distribution of common walnut is a direct consequence of the human activity. The selection of individual trees, to be used as basic materials for seed supply, should therefore be based mainly on phenotypic traits, rather than ecological features of the location: in species characterized by artificial diffusion, the adoption of Region of Provenance has a scarce significance and prominence should be given to the phenotype selection.
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