Abstract
ABSTRACTThe betaine aldehyde dehydrogenase (BADH) gene plays a multifunctional role in plants. It is an important factor in fragrance production, abiotic stresses and antibiotic-free selection of transgenic plants. Molecular studies have presented a new picture of this critical factor involved in abiotic stress responses via the MAPK (mitogen-activated protein kinase) signalling pathway in numerous plants. Besides BADH, glycine betaine performs an important function in plant tolerance to environmental stresses. The presence of glycine betaine can help maintain the integrity of cell membranes against unexpected environmental stresses. BADH leads to production of glycine betaine through the oxidation of betaine aldehyde. Hence, BADH is considered a key regulator for glycine betaine formation. Consequently, by providing glycine betaine as a chemical interface, there is a critical role of BADH in enhancing the tolerance in an extensive range of plants subjected to different destructive abiotic stresses. The present article reviews the significant multifunctional role of the BADH gene in various plants, and also particularly argues how this important gene plays a responsive function to different destructive abiotic stresses, and its potential use in crop improvement using advanced technologies. Consequently, cloning of more BADH genes, specially from stress-tolerant plants, discovering their responsive signalling roles under environmental stresses, and validating such candidates for their potential are very helpful, and can open new windows to generate new stress-resistant crop cultivars.
Highlights
It has been evidenced that the betaine aldehyde dehydrogenase (BADH) genes family code a diverse group of multi-functional proteins catalysing by different mechanisms [1]
Abiotic stresses have been regarded as the main causes of plant loss around the world
In the present review, we introduced a very good candidate gene, BADH, and the updated and recent knowledge regarding the significant role of this positive regulator of abiotic stresses in various plants
Summary
It has been evidenced that the betaine aldehyde dehydrogenase (BADH) genes family code a diverse group of multi-functional proteins catalysing by different mechanisms [1]. KEYWORDS BADH gene; crop aroma; antibiotic-free selection of transgenic plants; abiotic stresses; MAPK pathway; glycine betaine A functional BADH1 gene has been reported in all aromatic as well as non-aromatic rice cultivars, and its involvement in environmental stress tolerance has been proved [39].
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