Exploring physiological and genetic determinants of tillering in sorghum

Alam, M. M., Hammer, G. L., van Oosterom, E. J., Cruickshank, A. and Jordan, D. R. (2010). Exploring physiological and genetic determinants of tillering in sorghum. In: Proceedings of the 1st Australian Summer Grains Conference. 2010 Australian Summer Grains Conference, Gold Coast, Queensland, Australia, (). 21-24 June 2010.

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Author Alam, M. M.
Hammer, G. L.
van Oosterom, E. J.
Cruickshank, A.
Jordan, D. R.
Title of paper Exploring physiological and genetic determinants of tillering in sorghum
Conference name 2010 Australian Summer Grains Conference
Conference location Gold Coast, Queensland, Australia
Conference dates 21-24 June 2010
Proceedings title Proceedings of the 1st Australian Summer Grains Conference
Place of Publication Canberra, ACT, Australia
Publisher Grains Research & Development Corporation
Publication Year 2010
Sub-type Fully published paper
Total pages 12
Language eng
Abstract/Summary Tillering is a plastic trait of cereals that affects grain yield and adaptability through the regulation of leaf area development and fertile tiller production. Though the trait is important for crop adaptation, its physiology and genetics are poorly understood. Recent investigations in sorghum using material with a common genetic background revealed that variation in tillering in sorghum could be explained by internal plant competition, which could be quantified by a carbohydrate supply and demand index. To validate this result in a wide range of genotypes and to further explore the genetic determinants of this trait, experiments were conducted in a low tillering (glasshouse with low light intensity) and high tillering environment (spaced planting in the field). Tillering behaviour of 90 genotypes (inbred and hybrids) with diverse origin but structured genetic background was monitored. Genotypes differed significantly in total and fertile tiller number in both environments. While internal plant competition during the critical growth period for tillering explained part of the variation in tillering, the likely involvement of other factors like hormonal regulation was clear. An analysis of combining ability revealed that the expression of tillering is primarily additive and SC62C is a potential germplasm source for high tillering in sorghum. Wide genotypic variation in tillering revealed some promising genotypes for future genetic and physiological study.
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Created: Thu, 24 Mar 2011, 19:56:10 EST by Dr Mobashwer Alam on behalf of School of Agriculture and Food Sciences