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Abstract Detail


Evolutionary Developmental Biology (Evo-Devo)

Mauro-Herrera, Margarita [1], Malahy, Mike [2], Stromski, Jessica [3], Doust, Andrew N. [3].

Diversity of plant architecture in grasses: Developmental stages contribute to branching patterns in foxtail millet.

Plant architecture is the result of the inter-play of genetic and environmental factors. In grasses variation in patterns of branching is a major factor accounting for plant architecture diversity. Studies in maize have been particularly productive in elucidating the genetic control of branching. Comparative genomics has allowed information from maize, rice and other models to be applied to other grass systems. We are particularly interested in the foxtail millet model system because of the great variation in branching patterns that results from segregation in the offspring of crosses between domesticated foxtail millet and its wild progenitor, green millet. We present a preliminary analysis of branching variation in 142 recombinant inbred lines, derived from a cross between foxtail and green millet. These RILs (F7), along with the two parental lines, were evaluated in a greenhouse in the summer of 2008 in Stillwater, OK. Traits evaluated were height, number of tillers and number of axillary branches. Traits were recorded at three developmental stages: two weeks after planting (all vegetative), at flowering, and at harvest/maturity. Our preliminary results highlight the tradeoffs taking place among branching types over the growth of the plant. We identified correlations between tillering (basal branching) and axillary branching (branching along the distal extent of the culms and tillers) and height as well as various branching patterns. We tested correlation between trait segregation and genotype for some candidate genes from other model systems, including teosinte branched1 from maize, and found significant correlations. However, the correlation between genotype and phenotype appears to vary over the three growth stages measured, suggesting that mechanisms of genetic control of branching phenotypes varies over the life cycle of the plant.


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1 - Oklahoma State University, Department of Botany, 104 Life Sciences East , Stillwater, OK, 74078-3013, USA
2 - Oklahoma State University, Botany, 104 Life Sciences East, Oklahoma State University, Stillwater, Oklahoma, 74078, United States of America
3 - Oklahoma State University, Botany, 104 Life Sciences East, Stillwater, Oklahoma, 74078, United States

Keywords:
plant architecture
plant growth and development
branching
branching pattern
foxtail millet
growth phase.

Presentation Type: Oral Paper:Papers for Topics
Session: 62
Location: Cottonwood A/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 10:45 AM
Number: 62003
Abstract ID:556


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