Zbornik - Društvo genetičara Srbije
Zbornik - Društvo genetičara Srbije
Zbornik - Društvo genetičara Srbije
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IV-Pos-58 ZBORNIK ABSTRAKATA III KONGRESA GENETIÈARA SRBIJE 175<br />
Subotica, 30. novembar - 4. decembar 2004.<br />
PRIMENA NEPARAMETARSKE STATISTIKE U OCENI INTERAKCIJE<br />
GENOTIP X SPOLJNA SREDINA<br />
N. Deliæ, M. Babiæ, V. Anðelkoviæ, G. Stankoviæ i G. Saratliæ<br />
Institut za kukuruz «Zemun Polje», Beograd-Zemun<br />
Spoljašnja sredina odnosi se na set negenetièkih faktora koji afektiraju fenotipsku<br />
vrednost varijeteta koje ispitujemo u našim ogledima. Ukoliko se genotipovi razlikuju u<br />
njihovim vrednostima za odreðene osobine u razlièitim spoljnim sredinama to ukazuje na<br />
postojanje interakcije genotip x spoljna sredina. Statistièka analiza interakcije je od<br />
izuzetnog interesa u programima selekcije. Razlièiti statistièki pristupi u oceni interakcije<br />
genotip x spoljna sredina su u primeni: komponente varijanse, multivariaciona analiza,<br />
regresioni metodi, klaster tehnike...<br />
Istraivaèi u praktiènim situacijama nisu prvenstveno zainteresovani za numerièku<br />
kvantifikaciju interakcije genotip x spoljna sredina per se veæ samo za rekognosciranje<br />
iste.<br />
Klasièni parametrijski pristupi za analizu interakcije genotip x spoljna sredina poèivaju<br />
na nekoliko pretpostavki (normalitet distribucije, homogenost varijansi, aditivnost<br />
efekata). Ukoliko neka od ovih pretpostavki nije ispunjena, validnost ovih metoda moe<br />
biti narušena. Primenom neparametrijskih metoda, jednostavnih i lakih za primenu i<br />
analizu, izbegavaju se ove pretpostavke.<br />
U ovom radu, primenom nekoliko metoda neparametrijske ocene, analizirana je<br />
interakcije genotip x spoljna sredina za prinosa zrna 24 hibrida kukuruza (Zea mays L.) u<br />
šest lokaliteta. Primenjena je korelacija ranga po Spearman-u i Kendallov koeficijent<br />
saglasnosti u smislu: 1) kvantifikovanja relacije genotip x spoljna sredina i 2) grupisanja<br />
lokaliteta i genotipova.<br />
NON PARAMETRIC STATISTICAL APPROACH IN ESTIMATION OF<br />
GENOTYPE X ENVIROMENT INTERACTION<br />
An environment is represented by whole set of nongenetic factors that affect the<br />
phenotypic value of varieties under investigation in our trials.<br />
If the genotypes values for the particular trait differ trough locations that indicate presence<br />
of the genotyope x environment interaction. The statistical analsis of genotype x environment<br />
is of the outstanding interest in breeding programs. An different approaches in<br />
estimation of genotype x enviroment interaction are developed: variance components,<br />
multivariate analysis, regression methods, cluster techniques...<br />
In many practical situations the breeders are not just interested to quantify the genotype x<br />
environment interaction per se, but to recognize presence or absence of the same one.<br />
The mostly used, classical parametric approaches for an analysis of genotype x environment<br />
interaction are based on several assumptions: normality of the distribution, homogeneity<br />
of variances, additivity...<br />
If some of mentioned assumptions are not fulfilled, the validity of these methods may be<br />
questionable. By use of nonparametric methods, whish are simple and easy for analysis,<br />
all of the mentioned assumptions are avoided.<br />
In this paper we used several of non parametric techniques for an analysis of genotype x<br />
environment interaction for grain yield of 24 maize (Zea mays L.) hybrids through six locations.<br />
The procedures proposed by Spearman (rank correlation) and Kendall (coefficient<br />
of concordance) are used in order of: 1) quantification of relation of genotype x environment<br />
2) comparison and grouping of locations and genotypes.