Journalartikel

Jahr der Veröffentlichung: 1980

Seiten: 40-52

Zeitschrift: Zeitschrift für Pflanzenzüchtung = Journal of plant breeding

Bandnummer: 85

Heftnummer: 1

ISSN: 0044-3298

Verlag: Parey

Abstract: 
On the basis of investigations of mutually related inbred lines, their related crosses, single crosses, modified single crosses, 3-way crosses, modified 3-way crosses and double crosses at 4 ecologically different locations, data were collected on the vaue of crossing related inbred lines for hybrid breeding in maize. Different types of hybrids were also compared with their modified forms in a number of different characters. Concerning all the characters studied, related crosses considerably surpassed corresponding inbred lines in efficiency, particularly in grain yield per hectare and in grain yield per plant. Taken altogether, they always displaced explicitly higher vigor, and this was specially evident under unfavorable production conditions; better adaptability to changeable weather conditions was shown by the heterozygous related crosses. Related crosses proved to be better in seed production compared with homozygous inbred lines, either as seed parent or as pollinator. Taking the average of cases studied here, when related crosses were used for producing hybrids, heterotic ability was slightly higher than in corresponding conventional inbred lines. This was shown by grain yield and by other characters, because modified single crosses and modified 3-way crosses exceeded in efficiency the corresponding conventional hybrids. In individual cases, conventional single crosses were superior in relation to modified ones by 3.9 q/ha. This could be explained by a higher heterozygocity of related crosses and by reduced specific combining ability of modified single crosses. The best efficiency, taken on an average, was displayed by modified 3-way crosses and double hybrids. The highest yields were obtained by 2 single crosses. Comparing mean values of correlations and regressions of inbred lines and their hybrids, inbred lines and their related crosses, related crosses and their hybrids information was obtained about the inheritance of different characters and about the possibility of predicting the efficiency of crosses of related lines to their inbred lines, the modified hybrids demonstrated a smaller heterosis effect measured by the difference between the efficiency of lines and of hybrids, but a somewhat higher absolute efficiency as compared with conventional hybrids.

Harvard-Zitierstil: SCHUSTER, W. and ROJC, M. (1980) EFFICIENCY OF DIFFERENT HYBRID-TYPES OF MAIZE (ZEA-MAYS-L), ZEITSCHRIFT FUR PFLANZENZUCHTUNG-JOURNAL OF PLANT BREEDING, 85(1), pp. 40-52

APA-Zitierstil: SCHUSTER, W., & ROJC, M. (1980). EFFICIENCY OF DIFFERENT HYBRID-TYPES OF MAIZE (ZEA-MAYS-L). ZEITSCHRIFT FUR PFLANZENZUCHTUNG-JOURNAL OF PLANT BREEDING. 85(1), 40-52.