Effect of Climatic Conditions on Flowering of Walnut Genotypes in Romania
محورهای موضوعی : MicrobiologyBîrsanu (Ionescu) Mariana 1 , Cosmulescu Sina Niculina 2
1 - Horticulture Faculty, Doctoral School of Plant and Animal Resources Engineering, University of Craiova, Craiova Romania
2 - Department of Horticulture & Food Science, Horticulture Faculty, University of Craiova, Craiova, Romania
کلید واژه: temperature, Walnut, Flowering, Dichogamy,
چکیده مقاله :
The timing and lowering type of walnut genotypes (Juglans regia L.) is one of the important factors that lead to high and constant production. Therefore, the selection of homogame and spring frost tolerant genotypes has been among the most important priorities in breeding programs of walnut. The present paper analyzed the degree of dichogamy and the flowering time of 19 promising genotypes in walnuts from the sandy area, the S-V Oltenia region, Romania. Observations made over two calendar years have shown that the flowering period is influenced by environmental factors, especially temperature. The flowering time has changed from one year to the other, the high temperatures in spring accelerate the evolution of the male flowers,but the female flowers are not greatly influenced by these temperatures. Thus the type of flowering was not constantly, changing according to the climatic conditions of the two years. Knowing the type and timing of flowering of walnut genotypes is very important for pollination, because homogamy types are quite rare in the analyzed population.
Akca Y, Sen M (1997) The relationship between dichogamy and yield - nut characteristics in Juglans regia L. Acta Horticulturae. 442, 215-216.
Akca Y, Ozongun S (2004) Selection of late leafing, late flowering, laterally fruitful walnut (Juglans regia L.) types in Turkey. New Zealand Journal Crop and Horticultural Science. 32, 337–342.
Cosmulescu S, Baciu A. Botu M, Sarpe C (2001a) Flowering time and dichogamy in some walnut varieties, in relation to pollination possibility. Lucrări ştiinţifice USAMV Bucureşti seria B XLIV. 201-205.
Cosmulescu S, Baciu A, Botu M, Sarpe C (2001b) The influence of the medium temperatures and the relative air humidity on the flowering in walnut (Juglans regia L.). Analele Universitatii din Craiova. 129-133.
Cosmulescu S, Baciu A (2002) Research on setting-up the pollinators in walnut tree (Juglans regia). Scientific papers USAMV Ion Ionescu de la Brad Iaşi Series Horticulture. 1(45), 139-144.
Cosmulescu S, Baciu A, Botu M, Achim GH (2010) Environmental factors' influence on walnut flowering. Acta Horticulturae. 861, 83-88.
Godeanu I (1975) Contribuţii la stabilirea unor indici agrobiologici în cultura nucului din Oltenia. Teză de doctorat. Craiova.
Golzari M, Rahemi M, Hassani D, Vahdati K (2016) Xenia and metaxenia in Persian walnut (Juglans regia L.). Journal of Nuts. 7(2), 101-108.
Keles H, Akca Y, Ercisli S (2014) Selection of promising walnut genotypes (Juglans regia L.) from Inner Anatolia. Acta Scientiarum Polonorum Hortorum Cultus. 13(3), 167-173.
Khadivi-Khub A, Ebrahimi A, Sheibani F, Esmaeili A (2015) Phenological and pomological characterization of Persian walnut to select promising trees. Euphytica. 205(2), 557-567.
Kumar A, Sharma N (2013) Protandrous - protogynous dimorphism in indigenous selections from North Western India and some exotic cultivars of Persian walnut (Juglans regia L.). Advances in Horticultural Science. 61-66.
Kumar A (2016) Selection of homogamous walnut from seedling plantation in South Kashmir. Indian Journal of Plant Genetic Resources. 29(1), 59-65.
Lee H, Sumner D (2016) Modeling the effects of local climate change on crop acreage. California Agriculture. 70(1), 9-14.
Luedeling E, Gassner A (2012) Partial least squares regression for analyzing walnut phenology in California. Agricultural and Forest Meteorology. 158, 43-52.
Mahmoodi R, Hassani D, Amiri M E, Jaffaraghaei M (2016) Phenological and pomological characteristics of five promised walnut genotypes in Karaj, Iran. Journal of Nuts. 7(1), 1-8.
Manescu C, Baciu E, Cosmin S (1975) Controlul biologic în pomicultură. Editura Ceres Bucureşti.
Pintea M (2004) Nucul. Biologia reproductivă. Editor: Tipografia Centrală, Chişinău.
Prentovic M, Radisic P, Smith M, Sikoparija B (2014) Predicting walnut (Juglans spp.) crop yield using meteorological and airborne pollen data. Annals of Applied Biology. 165(2), 249-259.
Rezaee R, Vahdati K, Valizadeh M (2009) Variability of seedling vigour in Persian walnut as influenced by the vigour and bearing habit of the mother tree. The Journal of Horticultural Science & Biotechnology. 84 (2), 228–232.
Sen S M (1998) Walnut in Turkey. Production and economics of nut crops. Courses Booklets, Adana.
Sharma AK, Das B (2003) Genetic variation study on nut and kernel characters of walnut seedlings. Progressive Horticulture. 35(1), 11–13.
Solar A, Stampar F, Snole J (1995) The degree of heterodichogamy of some walnut cultivars (Juglans regia L.) in Slovenia. Acta Horticulturae. 442, 217–224.
