ARS | Publication request: DETECTION OF LINKAGE DISEQUILIBRIUM QTL'S CONTROLLING LOW-TEMPERATURE GROWTH AND METABOLITE ACCUMUlATIONS IN AN ADMIRAL BREEDING POPULATION OF LEYMUS WILDRYES

Submitted to: Euphytica
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 10, 2004
Publication Date: May 10, 2005
Citation: Hu, Z.M., Wu, X.L., Larson, S.R., Wang, R., Jones, T.A., Chatterton, N.J., Palazzo, A.J. 2005. Identification of molecular markers associated with soluble carbohydrates, anthocyanins, and growth characteristics in leymus (gramineae). Euphytica 141:263-280

Interpretive Summary: Low-temperature soluble carbohydrate accumulations are commonly associated with anthocyanin coloration, attenuated growth, and cold adaptation of cool-season grasses. A total of 870 mapped AFLP markers were used to detect QTL controlling soluble carbohydrate accumulations, anthocyanin coloration, and growth characteristics in a segregating population derived from open pollinated Leymus cinereus x L. triticoides hybrids. These perennial Triticeae grasses are distinguished by adaptation and growth habit. As expected, positive trait correlations and pleiotropic gene effects were detected for soluble carbohydrate accumulations and anthocyanin coloration. Likewise, positive trait correlations and pleiotropic gene effects were detected for tillering, leaf initiation, leaf growth, and regrowth after clipping. Findings suggest that genetic manipulations in five QTL regions on linkage groups 1A, 1B, 2A, 4Xm, and 5Ns could improve fructan and anthocyanin synthesis and all other four growth traits.

Technical Abstract: Low-temperature soluble carbohydrate accumulations are commonly associated with anthocyanin coloration, attenuated growth, and cold adaptation of cool-season grasses. A total of 870 mapped AFLP markers were used to detect QTL controlling soluble carbohydrate accumulations, anthocyanin coloration, and growth characteristics in a segregating population derived from open pollinated Leymus cinereus x L. triticoides hybrids. These perennial Triticeae grasses are distinguished by adaptation and growth habit. As expected, positive trait correlations and pleiotropic gene effects were detected for soluble carbohydrate accumulations and anthocyanin coloration. Likewise, positive trait correlations and pleiotropic gene effects were detected for tillering, leaf initiation, leaf growth, and regrowth after clipping. Findings suggest that genetic manipulations in five QTL regions on linkage groups 1A, 1B, 2A, 4Xm, and 5Ns could improve fructan and anthocyanin synthesis and all other four growth traits.