Genetic diversity and linkage disequilibrium of two homologous genes to maize D8: sorghum SbD8 and pearl millet PgD8

Li, Y. and Bhosale, S. and Haussmann, B.I.G. and Stich, B. and Melchinger, A.E. and Parzies, H.K. (2010) Genetic diversity and linkage disequilibrium of two homologous genes to maize D8: sorghum SbD8 and pearl millet PgD8. Journal of Plant Breeding and Crop Science, 2 (5). pp. 117-128.

[img] PDF
Restricted to ICRISAT researchers only

Abstract

Yield and yield stability of sorghum [Sorghum bicolor (L.) Moench.] and pearl millet [Pennisetum glaucum (L.) R.Br.] are highly influenced by flowering time and photoperiodic sensitivity in the arid to semi-arid regions of West and Central Africa. Photoperiodic sensitivity is the key adaptation trait of local landraces because it assures flowering at the end of the rainy season, independent of variable dates of planting. Flowering time genes are mainly integrated into four pathways with close interaction among each other: Vernalization, autonomous, GA (gibberellic acid) and photoperiod. In the GA pathway, maize D8, wheat RHT1 and rice SLR have been identified as homologous genes to the Arabidopsis GAI, which is a negative regulator of GA response. We have identified two homologous genes to D8: Sorghum SbD8 and pearl millet PgD8. These genes were expressed in the root and leaves of sorghum and pearl millet as revealed by EST database search and reverse transcription PCR, respectively. The genetic diversity of SbD8 was considerably lower than that of PgD8. The extent of linkage disequilibrium in PgD8 is lower than that of maize D8. SbD8 and PgD8 polymorphisms might be appropriate for dissection of photoperiod sensitivity using association mapping approaches.

Item Type: Article
Author Affiliation: Plant Breeding, Technische Universität München/Centre of Life and Food Sciences Weihenstephan, 85350 Freising, Germany.
Subjects: Crop Improvement > Genetics
Crop Improvement > Plant Breeding
Divisions: Millet
Sorghum
Maize
Depositing User: Sandhya Gir
Date Deposited: 02 May 2011 06:19
Last Modified: 02 May 2011 06:19
Official URL: http://www.mpiz-koeln.mpg.de/downloads/Publikation...
URI: http://eprints.icrisat.ac.in/id/eprint/1941

Actions (login required)

View Item View Item