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

Li, Yongle 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. ISSN 2006-9758

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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
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	DELLA proteins; GA pathway; flowering time; photoperiod sensitivity; sorghum; pearl millet
Agro Tags:	<b>Agrotags</b> - planting | developmental stages | genes | millets | sorghum | pearl millet (plant) | genetics | photoperiodicity | polymorphism | maize <br><b>Fishtags</b> - pearls <br><b>Geopoliticaltags</b> - germany | usa | africa | act | central africa | niger
Subjects:	Mandate crops > Millets Mandate crops > Sorghum
Depositing User:	Users 6 not found.
Date Deposited:	28 Jul 2011 09:00
Last Modified:	21 Sep 2011 03:35
URI:	http://oar.icrisat.org/id/eprint/125
Official URL:	http://www.academicjournals.org/jpbcs/PDF/pdf%2020...
Projects:	UNSPECIFIED
Funders:	BMZ
Acknowledgement:	We thank staff of the International Crops Research Institute for the Semi-Arid Tropics for providing plant material, phenotypic data and valuable advice. We further thank Dr. A. C. Thuillet and Dr. N. von Wirén for their helpful suggestions and Sabine Boger for her technical assistance. This research was supported by the Federal Ministry for Economic Cooperation and Development of Germany (BMZ).
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