AtRAV1 and RAV2 overexpression in cotton increases fiber length and delays flowering

Amandeep Mittal, Yingwen Jiang, Glen Ritchie, John Burke, Christopher Rock

Research output: Contribution to journalArticlepeer-review

Abstract

There is a longstanding problem of an inverse relationship between cotton fiber qualities versus high yields. To better understand drought stress signaling and adaptation in cotton (Gossypium hirsutum) fiber development, we expressed the Arabidopsis transcription factors RELATED_TO_ABA-INSENSITIVE3/VIVIPAROUS1/(RAV1) and AtRAV2, which encode APETALA2-Basic3 domain proteins shown to repress transcription of FLOWERING_LOCUS_T (FT) and to promote stomatal opening cell-autonomously. In three years of field trials, we show that AtRAV1 and AtRAV2-overexpressing cotton had ~5% significantly longer fibers with only marginal decreases in yields under well-watered or drought stress conditions that resulted in 40-60% yield penalties and 3-7% fiber length penalties in control plants. The longer transgenic fibers from drought-stressed transgenics could be spun into yarn which was measurably stronger and more uniform than that from well-watered control fibers. The transgenic AtRAV1 and AtRAV2 l
Original languageEnglish
Pages (from-to)78-95
JournalPlant Science ms #PSL-D-15-00513
DOIs
StatePublished - Dec 1 2015

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