Mixed model for estimating the effects of the Rhtl dwarfing allele, background genes, CCC and their interaction on cuim and leaf|elongation of Triticum aestivum L., spring wheat
Material type: ArticleLanguage: En Publication details: 1994Subject(s): In: Heredity v. 72, p. 237-241Summary: A model for the effects of a single gene (SG), background genes (BG), an environmental factor (EF) and the effects of their interactions on quantitative traits is developed. It is a mixed model where SG and EF have fixed effects while BG have a random effect. This model is applied to the analysis of the effects of the dwarfing alleles at the RhtJ locus (SG),interfamily variation (representing BG) and the growth regulant CCC (EF) on coleoptile, leaf and culm length of spring wheat. Culm length of F7 families was tested in a field experiment in the absence of lodging. Coleoptile and leaf lengths of F9 seedlings were examined in a growth room at 18°C. Each family was descended from a single F5 plant, heterozygous at the RhtI locus. Within each family the homozygous tall (rhtl) and the homozygous semi-dwarf (Rhtl) genotypes were identified. Thus, comparing nearly isogenic genotypes within random families in advanced generations enabled the estimation of all the main effects and interactions between SG, BG and EF. The restricted maximum likelihood (REML) method was used in the analysis of variance.In all the three organs CCC caused significant shortening which was somewhat greater in the rhtl than in the Rhtl genotype and the CCC X RhtI interaction effect on culm length was significant. Considerable and significant interfamily variation was found for all three characters. A significant CCC x family interaction effect on the length of the first leaf was obtained. This interaction effect was of a specific trend indicating a distinct increase in the response to CCC with greater leaf length. No CCC X Rht] X family or Rhtl X family interaction effects were detected. The use of two graphical/analytical methods proved to be complementary for a complete evaluation of two-way interactions (CCC x families and CCC x Rhtl in the present study).Item type | Current library | Collection | Call number | Status | Date due | Barcode | Item holds | |
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Article | CIMMYT Knowledge Center: John Woolston Library | Reprints Collection | Available |
Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0018-067X
A model for the effects of a single gene (SG), background genes (BG), an environmental factor (EF) and the effects of their interactions on quantitative traits is developed. It is a mixed model where SG and EF have fixed effects while BG have a random effect. This model is applied to the analysis of the effects of the dwarfing alleles at the RhtJ locus (SG),interfamily variation (representing BG) and the growth regulant CCC (EF) on coleoptile, leaf and culm length of spring wheat. Culm length of F7 families was tested in a field experiment in the absence of lodging. Coleoptile and leaf lengths of F9 seedlings were examined in a growth room at 18°C. Each family was descended from a single F5 plant, heterozygous at the RhtI locus. Within each family the homozygous tall (rhtl) and the homozygous semi-dwarf (Rhtl) genotypes were identified. Thus, comparing nearly isogenic genotypes within random families in advanced generations enabled the estimation of all the main effects and interactions between SG, BG and EF. The restricted maximum likelihood (REML) method was used in the analysis of variance.In all the three organs CCC caused significant shortening which was somewhat greater in the rhtl than in the Rhtl genotype and the CCC X RhtI interaction effect on culm length was significant. Considerable and significant interfamily variation was found for all three characters. A significant CCC x family interaction effect on the length of the first leaf was obtained. This interaction effect was of a specific trend indicating a distinct increase in the response to CCC with greater leaf length. No CCC X Rht] X family or Rhtl X family interaction effects were detected. The use of two graphical/analytical methods proved to be complementary for a complete evaluation of two-way interactions (CCC x families and CCC x Rhtl in the present study).
English
Carelia Juarez
Reprints Collection