The identification of bands related to yields and stability in maize hybrids and their parental components

Abstract

Geneticists have been trying to explain adaptability and stability of a genotype in terms of a desirable combination of alleles expressed via epistasis. Stability determined in one set of data is very often stability of a genotype to a prevalent stress factor in a moment of carrying out the experiment. However, grain stability of a certain genotype can be a result of different factors, such as tolerance to drought, or to some important diseases and pests. Yield and yield stability of 15 maize hybrids were observed in 24 environments. The level of the interaction effect of studied maize hybrids was identified by the AMMI analysis, while a number of bands positively related to yield and stability of studied maize hybrids were identified by a genetic characterization by RAPD markers. Bands positively related to yields were present to a greater extent in parents originating from the BSSS population, while bands positively related to stability were more present in parents originating from the Lancaster population.

Gentičari pokušavaju da objasne adaptabilnost i stabilnost genotipa u smislu poželjne kombinacije alela ispoljenih kroz epistazu. Međutim, stabinost definisana u jednom setu podataka je vrlo često zapravo stabilnost genotipa na dominantni stresni faktor u momentu izvođenja ogleda. Stoga, stabilnost rodnosti određenog genotipa može biti rezultat različitih faktora kao što su tolerantnost na sušu ili neku značajnu bolest ili štetočinu. U ovom radu ispitivan je nivo i stabilnost prinosa 15 hibrida kukuruza u 24 poljne sredine. Nivo interakcijskog efekta definisan je AMMI analizom. Genetička karakterizacija je urađena RAPD markerima. Trake pozitivno vezane za visok nivo prinosa su najčešće bile prisutne u roditeljima koji vode poreklo iz BSSS populacije dok su trake pozitivno vezane za stabilnost bile u značajnom procentu prisutne kod roditelja Lancaster populacije.