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Iowa State University

2018

Plant Sciences

Graduate Theses and Dissertations

Brassinosteroid

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To Grow Or Survive: Plants Modulate Brassinosteroid-Regulated Transcription Factor Bes1 During Drought To Balance Growth And Stress Responses, Trevor Nolan Jan 2018

To Grow Or Survive: Plants Modulate Brassinosteroid-Regulated Transcription Factor Bes1 During Drought To Balance Growth And Stress Responses, Trevor Nolan

Graduate Theses and Dissertations

Understanding how plants balance growth and stress responses is essential to optimize crop yield in an ever-changing environment. Brassinosteroids (BRs) regulate plant growth and stress responses, including that of drought. BRs signal to control the activities of the BES1/BZR1 family transcription factors (TFs), which in turn mediate the expression of more than 5,000 BR-responsive genes. The network through which BES1 regulates the large number of target genes and the factors that modulate BES1 during stress are only beginning to be understood. In this thesis, I investigated several mechanisms that converge on BES1 to balance BR-regulated growth and stress ...


Functions And Mechanisms Of Ap2/Erf And Myb Family Transcription Factors In Brassinosteroid-Regulated Plant Growth And Stress Responses, Zhouli Xie Jan 2018

Functions And Mechanisms Of Ap2/Erf And Myb Family Transcription Factors In Brassinosteroid-Regulated Plant Growth And Stress Responses, Zhouli Xie

Graduate Theses and Dissertations

Brassinosteroids (BRs) are a class of plant steroid hormones that play important roles in plant growth and development, as well as biotic and abiotic stress responses. BR functions through membrane receptor BRI1, co-receptor BAK1 and a cascade of signaling components to regulate BES1/BZR1 family transcription factors. Comprehensive chromatin-binding and transcriptome reveal that more than 500 transcription factors are regulated by BES1/BZR1, which supports the idea that BES1/BZR1 control multiple biological processes through diverse transcription factors. Among those transcription factors, there are two classes of typical stress responsive transcription factors: TINYs in AP2/ERF family and BOS1 in ...