Genetic parameters of yield components and pomologic properties in raspberry seedlings

Abstract

Over a three-year period yield components and pomologic properties were studied in 20 raspberry seedlings obtained by open pollination of Meeker's yellow clone. The primary goals of this research were to determine its variability components, coefficients of genetic and phenotypic variation and coefficient of heritability in a broader sense. The analysis of the components of total variance evidenced that higher proportion of genotypic variance was found with fruit shape index (30.84%) and sucrose content (35.61%). The results revealed that genotypic coefficient of variation were less than its corresponding estimates of phenotypic coefficient of variation for all traits which indicated significant role of environment in the expression of these characters. The values of heritability coefficients, in a broader sense, were high except for number of flowers per inflorescens (9.47%), titratable acidity (6.38%) and inverted sugar content (28.88%). Nine characters had h2 in interval from 50 to 80% but for fruit weight and fruit length was greater than 80% which implies the high potential of genetic improvement in those traits.

Komponente prinosa i pomološke osobine kod 20 sejanaca dobijenih slobodnom oplodnjom žutog klona sorte Miker ispitivano je tokom perioda od tri godine. Primarni cilj ovih ispitivanja bilo je da se utvrde komponente varijabilnosti, koeficijenti genetičke I fenotipske varijacije i heritabilnost u širem smislu. Analizom komponenti ukupne varijabilnosti ustanovljeno je da su geneticke razlike medu sejancima u velikom procentu uslovile varjabilnost indeksa oblika ploda (30.84%) i sadržaja saharoze (35.61%). Kod svih osobina takođe je utvrđeno da su koeficijenti genetičke varijacije bili manji u odnosu na fenotipske koeficijente varijacije što ukazuje na značajan uticaj spoljašnjih faktora u ekspresiji ovih osobina. Vrednosti koeficijenta heritabilnosti u širem smislu su bili visoki osima za broj cvetova po cvasti (9.47%), ukupnim kiselinama (6.38%) i sadržaju invertnih šećeria (28.88%). Devet osobina imalo je h2 u intervalu od 50 do 80%, dok jeza masu i dužinu ploda bio veći od 80% što pokazuje visok potencijal za poboljšanje ovih osobina.