RT Journal Article
SR Electronic
T1 Time dependent genetic analysis links field and controlled environment phenotypes in the model C<sub>4</sub> grass <em>Setaria</em>
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 083865
DO 10.1101/083865
A1 Max J. Feldman
A1 Rachel E. Paul
A1 Darshi Banan
A1 Jennifer F. Barrett
A1 Jose Sebastian
A1 Muh-Ching Yee
A1 Hui Jiang
A1 Alexander E. Lipka
A1 Thomas P. Brutnell
A1 José R Dinneny
A1 Andrew D.B. Leakey
A1 Ivan Baxter
YR 2016
UL http://biorxiv.org/content/early/2016/11/14/083865.abstract
AB Vertical growth of plants is a dynamic process that is influenced by genetic and environmental factors and has a pronounced effect on overall plant architecture and biomass composition. We have performed twelve controlled growth trials of an interspecific Setaria italica x Setaria viridis recombinant inbred line population to assess how the genetic architecture of plant height is influenced by developmental queues, water availability and planting density. The non-destructive nature of plant height measurements has enabled us to monitor vertical growth throughout the plant life cycle in both field and controlled environments. We find that plant height is reduced under water limitation and high density planting and affected by growth environment (field vs. growth chamber). The results support a model where plant height is a heritable, polygenic trait and that the major genetic loci that influence plant height function independent of growth environment. The identity and contribution of loci that influence height changes dynamically throughout development and the reduction of growth observed in water limited environments is a consequence of delayed progression through the genetic program which establishes plant height in Setaria. In this population, alleles inherited from the weedy S. viridis parent act to increase plant height early, whereas a larger number of small effect alleles inherited from the domesticated S. italica parent collectively act to increase plant height later in development.