The homologous homeodomain-leucine zipper transcription factors HaHB1 and AtHB13 confer tolerance to drought and salinity stresses via the induction of proteins that stabilize membranes

Plant Biotechnology Journal
Julieta V Cabello, Raquel L Chan

Abstract

Transgenic approaches to conferring tolerance to abiotic stresses have mostly resulted in some degree of plant yield penalty under normal or mild stress conditions. Recently, we have reported that the homeodomain-leucine zipper transcription factors (TFs) HaHB1 and AtHB13 were able to confer tolerance to freezing temperatures via the induction of glucanase (GLU and PR2) and chitinase (PR4) proteins. In the present study, we show that the expression of these TFs, as well as that of their putative targets AtPR2, AtPR4 and AtGLU, is up-regulated by drought and salinity stresses. Transgenic plants overexpressing separately these five genes exhibited tolerance to severe drought and salinity stresses, displaying a cell membrane stabilization mechanism. Under normal or mild stress conditions, these plants achieved an improved yield associated with higher chlorophyll content. Moreover, overexpression of the sunflower HaHB1 gene from its own, inducible, promoter conferred a high drought-stress tolerance without yield penalty under normal or mild stress conditions. We propose these TFs as potential biotechnological tools to breed crops for tolerance to multiple stresses and for increased yield.

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Citations

Mar 5, 2016·Journal of Experimental Botany·Christine H FoyerRobert D Hancock
Sep 7, 2016·Plant Science : an International Journal of Experimental Plant Biology·Facundo RomaniRaquel L Chan
Mar 5, 2014·The Plant Journal : for Cell and Molecular Biology·Peitao LüJunping Gao
Apr 1, 2014·Current Opinion in Biotechnology·Julieta V CabelloMatias D Zurbriggen
Jan 13, 2018·Frontiers in Plant Science·Saghar Ebrahimian-MotlaghSalma Balazadeh
Feb 7, 2019·Journal of Experimental Botany·Fernanda Gabriela GonzálezRaquel Lía Chan
Mar 12, 2019·Journal of Experimental Botany·José L ArausMarta S Lopes
Mar 10, 2019·Physiologia Plantarum·Shaohua GongCheng Zhu
Aug 25, 2019·The Plant Journal : for Cell and Molecular Biology·María F PerottiRaquel L Chan
Sep 14, 2020·The Plant Journal : for Cell and Molecular Biology·Susan M MoengaDouglas R Cook
Oct 27, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Lei WuJing Wu

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