Abstract
Halotropism is a sodium specific tropic movement of roots in order to obtain the optimal salt concentration for proper growth and development. Numerous results suggest that halotropic events are under the control and regulation of complex plant hormone pathway. This minireview collects some recent evidences about sodium sensing during halotropism and the hormonal regulation of halotropic responses in glycophytes. The precise hormonal mechanisms by which halophytes plant roots perceive salt stress and translate this perception into adaptive, directional growth forward increased salt concentrations are not well understood. This minireview aims to gather recently deciphered information about halotropism focusing potential hormonal aspects both in glycophytes and halophytes. Advances in our understanding of halotropic responses in different plant species could help these plants to be used for sustainable agriculture and other future applications.
Highlights
There is a hypothesis that glycophyte plant species show negative halotropism (Li and Zhang, 2008; Galvan-Ampudia et al, 2013) orientating their roots from supraoptimal salt concentration in the soil, some halophytes depending from their halophyte features can respond by positive halotropism for reaching optimal salt concentration
In case of glycophyte Arabidopsis thaliana, 50–100 mM NaCl treatment provoked remarkable root bending as a feature of halotropism (Sun et al, 2008), and showed negative halotropism after 150 mM NaCl to avoid salt injury (Galvan-Ampudia et al, 2013)
Deolu-Ajayi et al (2019) recently identified those genetic loci in natural accessions of Arabidopsis thaliana by genome-wide association study (GWAS) which could be involved in early salt stress responses of roots
Summary
Department of Plant Biology, Institute of Biology, Faculty of Science and Informatics, University of Szeged, Szeged, Hungary Reviewed by: Karim Ben Hamed, Center of Biotechnology of Borj Cedria (CBBC), Tunisia Ganesh Chandrakant Nikalje, R. K. Talreja College of Arts, Science and Commerce, India
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