Šumarski list, Vol. 135 No. 13, 2011.
Izvorni znanstveni članak
Phenotypic Stability andAdaptability of Families of Common Walnut (Juglans regia L.) in Progeny Tests
Tibor Litvay
; Hrvatski šumarski institut Jastrebarsko
Sažetak
Common walnut (Juglans regiaL.) belongs to the most important tree species in the world. With the origin in central Asia it is widespread worldwide except in tropical and subtropical regions. Its broad applications in nourishment, medicine, pharmacology and food processing, wood and leather industry makes it one of the most valuable plant species.
The distribution of common walnut in Croatia is more a result of favorable climatic and soil conditions than the organized cultivation. In Croatian common walnut is mostly spread in the hilly terrains around Hrvatsko Zagorje around Požega, Koprivnica, Bjelovar, Daruvar, Kutina, Sisak, Jastrebarsko Ozalj; in Eastern Slavonia around Vukovar and Ilok in Baranja. In Dalmatia around Split, Drniš, and Zadar hinterland, in Primorje in the hinterland of Novi Vinodolski, Crikvenica, Senj, in Istria and part of Herzegovina.
This paper presents the results of work on the selection of individual trees and the establishment of halbsib-progeny tests, over the five-year research of quantitative and morphometric traits in progeny tests of common walnut, tested in two habitats. Research sites are located at two locations that were most suitable for testing due to the ecological and soil characteristics of selections in continental part of Croatia. These sites are: Zabrdica, under forestry office Sokolovac and Kozarevac I under the forestry office Kloštar Podravski.
The study of interaction between heritage and environment is based on the assumption that environment must be controlled (similar growing conditions) and phenotypes must be known, as done in these experiments, devoting the special attention to environmental factors. In such planned and conducted experiments, relationship between genotype and environment can be studied through so-called phenotypic stability. Analysis of phenotypic stability of common walnut families in the localities (habitats) was conducted in the model of regression analysis in which the phenotypic values (growth and fruit mass) of specific families are shown as a linear function of the environment. For the independent variable it is selected the mean value of the corresponding phenotypic characteristic of families, ie diameter growth and fruit mass of the center tree at the locality. Results are listed in Table 1, 2 and shown in Figure 4, 5.
Below average growth stability and specific adaptability to high-yield environment (Zabrdica) showed families Stain 2, 4 and 6, while Stains 12, 13 and 18 showed above average stability and specific adaptability to adverse environment (Kozarevac I). Other families showed the average stability and good adaptability to all environments (Zabrdica and Kozarevac I) (Table 1 and Figure 4).
Below average fruit mass stability and specific adaptability to high-yield environment (Kozarevac I) showed only Stain 16, while Stains 1, 3, 4, 6, 15, 17, and 18 showed above average stability and specific adaptability to adverse environment (Zabrdica). Other families showed the average stability and good adaptability to all environments (Zabrdica and Kozarevac I) (Table 2 and Figure 5).
Based on adaptation capacity and production potential of the particular genotype can be determined its use-value for plantation raising. Genotypes with good adaptation ability and high productivity are the best solution for growing the common walnut in plantations.
The research results provide a good basis for creating the Croatian variety of walnut same as the opportunities for permanent preservation of genetic resources for the common walnut.
Ključne riječi
Common Walnut; phenotypic stability; adaptability; halbsib-progeny tests
Hrčak ID:
72313
URI
Datum izdavanja:
14.10.2011.
Posjeta: 3.004 *