Epistatic Transcription Factor Networks Differentially Modulate Arabidopsis Growth and Defense.

Epistatic Transcription Factor Networks Differentially Modulate Arabidopsis Growth and Defense.

Li, Baohua;Tang, Michelle;Caseys, Céline;Nelson, Ayla;Zhou, Marium;Zhou, Xue;Brady, Siobhan M;Kliebenstein, Daniel J;
Genetics 2019
284
li2019epistaticgenetics

Abstract

Plants integrate internal and external signals to finely coordinate growth and defense for maximal fitness within a complex environment. A common model suggests that growth and defense show a trade-offs relationship driven by energy costs. However, recent studies suggest that the coordination of growth and defense likely involves more conditional and intricate connections than implied by the trade-off model. To explore how a transcription factor (TF) network may coordinate growth and defense, we used a high-throughput phenotyping approach to measure growth and flowering in a set of single and pairwise mutants previously linked to the aliphatic glucosinolate (GLS) defense pathway. Supporting a link between growth and defense, 17 of the 20 tested defense-associated TFs significantly influenced plant growth and/or flowering time. The TFs' effects were conditional upon the environment, age of the plant and more critically varied across the growth and defense phenotypes for a given genotype. In support of the coordination model of growth and defense, the TF mutant's effects on short-chain (SC) aliphatic GLS and growth did not display a simple correlation. We propose that large TF networks integrate internal and external signals and separately modulate growth and the accumulation of the defensive aliphatic GLS.

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