ESTIMATION OF GENETIC EFFECTS ON PLANT HEIGHT IN TWO SPECIFIC PAIRS OF INBRED LINES AND ITS SIX BASIC GENERATIONS
Z. Zdunić, D. Šimić, I. Brkić, A. Jambrović, Renata Zdunić, Tatjana Ledenčan
[Poljoprivreda / Agriculture. 9(1):5-8, June 2003.]
Scientific review
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ABSTRACT Estimation of genetic effects on economically important traits is a common procedure in the most breeding programmes at Agricultural Institute Osijek. This paper deals with estimation of adequacy over additive/dominance model of inheritance as well as estimation and comparison of genetic effects on plant height for two specific pairs of inbreds (A672×Va99; A672×Os6-2), and its six basic generations (P2, F1, F2, BCP1 and BCP2). Two year investigation was carried out at two locations in eastern Croatia. The trails consisted of 121 entries of different inbreeding level derived by partial diallel mating design followed by selfing and back crossing. Simple lattice experimental design was used in both investigated years. Goodness of fit test results indicated the additive/dominance model failed to explain all differences among generation means. Digenic epistatic model appeared to be adequate in both investigated pairs of inbreds at least in one of the investigated years. Estimations and comparisons of genetic effects for selected pairs of inbreds and basic generations revealed prevailing dominance effects when compared to additive. |
Keywords: maize, plant height, Generation mean analysis, genetic effects
PROCJENA GENETSKIH EFEKATA ZA VISINU BILJKE NA DVA SPECIFIČNA PARA INBRED LINIJA KUKURUZA I ŠEST GENERACIJA KRIŽANJA
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SAŽETAK Procjena genetskih efekata za svojstva od interesa sastavni je dio većine oplemenjivačkih programa na Poljoprivrednom institutu Osijek. Ovaj se rad bavi procjenom prihvatljivosti (adequacy) aditivno/dominantnog modela nasljeđivanja te procjenom i usporedbom genetskih efekata za visinu biljke na dva odabrana specifična para inbred linija (A672×Va99 i A672×Os6-2) i njihovih šest osnovnih generacija križanja (P1, P2, F1, F2, BCP1 i BCP2). Provedena su dvogodišnja istraživanja na dva lokaliteta u istočnoj Hrvatskoj. Pokusi su se sastojali od 121 člana različitog stupnja inbridinga dobivenih parcijalnim dialelnim križanjem, zatim samooplodnjom i povratnim križanjem. U obje godine istraživanja korišten je nepotpuni blokni (jednostavni latis - lattice) raspored. Rezultati goodnes of fit testa ukazali su da aditivno/dominantni model nije mogao objasniti sva variranja među srednjim vrijednostima istraživanih generacija. Digeni epistatski model pokazao se prihvatljivim kod oba para barem u jednoj godini istraživanja. Procjene i usporedbe genetskih efekata za izdvojene specifične parove i šest generacija križanja otkrili su prevladavajuće dominantne učinke gena u odnosu na aditivne. |
Ključne riječi: kukuruz, visina biljke, analiza srednjih vrijednosti generacija, genetski efekti
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