Additive and dominant effect for percen brix of stalk juice and estimated stalk sugar content and their phenotypic correlation in corn (Zea mays L.)
1995
Koinuma, K. (Kyushu National Agricultural Experiment Station, Chikugo, Fukuoka (Japan)) | Ikegaya, F. | Ito, E.
Recently it has been reported that percent Brix of stalk juice is applicable to indirect estimation of stover digestibility in forage corn. In this study, additive and dominant effect for percent Brix of stalk juice and estimated stalk sugar content (ESSC) were estimated by means of generation mean analysis for P1, P2, F1, F2, B1 and B2 generations of two crosses: Na 26(flint) x Oh43Ht(dent) and Na7(dent) x Oh43Ht. The relationship between percent Brix and ESSC was also investigated to clarify the effect of correction of percent Brix with dry matter content. Estimates of additive effect were approximately three times as large as dominant effect in both traits and both crosses. Estimates of dominant effect were small in both crosses and not significant in Na26 x Oh43Ht. Percent Brix was highly correlated with ESSC in segregating generations, although the correlation were somewhat lower when percent Brix was higher than 9 to 10%. From the above results, it is inferred that selection of genotypes with high percent Brix of stalk juice is rather easy and percent Brix of F1 hybrids is almost equivalent to the mid parental values. In indirect selection of stover digestibility, however, it is desirable that the preparatorily selected materials with high percent Brix are re-evaluated by ESSC
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