engleski

Inheritance of boron status in grain of maize genotypes

Twenty-eight direct diallel progenies of eight genetically divergent maize inbred lines (single-cross hybrids or crosses) were grown under field conditions on Osijek eutric cambisol (very fertile soil of favorable physical and chemical properties) during the 1994 growing season. The field experiment was a randomized block design with four replicates. Self-pollination was conducted with two randomly chosen plants per plot of three replicates. B contents in grain were determined by ICP technique. The effects of general combining abilities (GCA) and specific combining abilities (SCA) were significant at p<0.01. Differences in grain B status among tested crosses under identical environmental conditions were from 1, 10 ppm B to 2.41 ppm B. In general, seven crosses including Os-8Id-93 as a parent had considerably higher B contents in grain (mean 1.94 ppm B) in comparison with the remaining 21 tested crosses (mean 1.31 ppm B). Also, inclusion of Os1-93 and Os2-93 parents (total 13 crosses) resulted in lower grain B contents (means 1.28 ppm B) than in remaining 15 crosses (mean 1.66 ppm B). However, the results showed that the crosses containing the line Os8Id-93 as parents had generally the highest mean B content. The exceptions were the respective crosses of this line with the lines Os5-93 and Os 7-93, in which specific combining abilities were notably the lowest. This indicates a specific influence of these two lines on the line Os8Id-93. Moreover, the significantly best specific combination was Os5-93 x Os 7-93. Since only these two lines trace back to original Croatian synthetic populations, we suggest that the genetic background of the material plays a very important role for the inheritance of B efficiency in maize grains.

boron ; grain ; inheritance ; maize

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