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Abstract Detail


Ecophysiology

Moriuchi, Ken [1].

Genetic differences in patterns of growth, development, and plastic response to environmental quality in a perennial plant.

THE natural environments of plants comprise many factors that can vary independently, and plants must integrate development over these factors to produce an appropriate phenotype. Theory for plant response to stress suggests that plants may integrate multiple environmental variables by responding to overall quality of environments defined as the average growth rate in an environment. In previous work we showed that individuals of Viola septemloba (Violaceae) alter their phenotype in response to environment quality and the observed responses are consistent with the predictions of stress response theory. Differences in traits of plants grown in low- and high-resource environments were not simply the result of differences in size, but arose because plants followed different developmental trajectories in the two environments. Here we compare the developmental trajectories among eight inbred lines of V. septemloba grown in low- and high-resource environments. We report variation among lines and significant line by environment interactions for several traits indicating genetic variation for developmental trajectory and for the pattern of alteration of development in response to the environment. Lines with distinct developmental trajectories and flexibilities permit dissection of the genetic basis of developmental response to the environment and the developmental integration of multiple trait responses to complex environments.[c.e.:srb]


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1 - Florida State University, Department of Biological Sciences, Tallahasse, Florida, 32306-1100, USA

Keywords:
plant stress
development
phenotypic plasticity
biomass allocation.

Presentation Type: Oral Paper:Papers for Topics
Session: 42-3
Location: 120/Ayres
Date: Tuesday, August 1st, 2006
Time: 9:30 AM
Abstract ID:458


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