Naslov
Correlation between genetic similarities of maize inbreds revealed by SSRs and grain yield of their respective crosses

Autori
Buhiniček, Ivica ; Pejić, Ivan ; Vragolović, Antun ; Suresh, Jayanti ; Phillips, Ronald L.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Genomics and Breeding / - Barcelona : CSIC, 2003, 41-41

Skup
XIXth Eucarpia international conference on maize and sorghum

Mjesto i datum
Barcelona, Španjolska, 04.06.2003. - 07.06.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
maize; SSRs; genetic similarities; grain yield; midparent heterosis

Sažetak
The level of heterosis of the F1 maize hybrid combinations depends on genetic divergence between parents (inbred lines). The higher yielding hybrid combinations are often derived from parents originating from genetically divergent sources. SSR marker polymorphisms can be used to assess the level of genetic divergence or similarity among elite inbred lines. The objective of the investigation was to study correlation of genetic similarity for maize inbred pairs revealed by SSRs vs. (1) grain yield and (2) midparent heterosis for grain yield (MPH) of their respective crosses. Two field experiments with RCBD in four replication and two environments were conducted in year 2001. The first experiment has 21 diallel crosses including their parents (7 related inbred lines) and a second one included 21 Line x Tester crosses (7 inbred lines from the previous experiment crossed to 3 testers) along with respective lines and testers. Polymorphisms were detected with 73 public SSR markers using agarose gels. Thirty-nine useful polymorphic marker loci were selected, and they were used for calculating the Dice genetic similarity index (GS) - (Nei and Li, 1979). Correlation between the GS values of the 21 diallel crosses and their respective grain yield was r= 0.08 for the first and r= -0.40 for the second environment. When the GS value was correlated with MPH for grain yield, again there was no significant correlation with the first (r= 0.01) and poor correlation was found for the second environment (r= -0.39). But the correlation between the GS values of the 21 "line x tester" crosses and their grain yield was much higher and significant values of r were obtained for both environments, r= -0.86** and r= -0.68**, respectively. Almost complete negative correlation was obtained between GS and MPH for grain yield (r= -0.89** and r= -0.86**, respectively for two environments) what would be expected if higher yield and heterosis were associated with smaller genetic similarity.

Izvorni jezik
Engleski

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