Fragrance in rice ( Oryza sativa ) is associated with reduced yield under salt treatment

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Environmental and Experimental Botany, ISSN: 0098-8472, Vol: 68, Issue: 3, Page: 292-300

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Timothy Liam Fitzgerald; Daniel Lex Ean Waters; Lyndon Owen Brooks; Robert James Henry
Elsevier BV
Agricultural and Biological Sciences; 2-Acetyl-1-pyrroline; abiotic stress; betaine aldehyde dehydrogenase; gamma-amino butyric acid; promoter motifs; seed yield; gene expression; Plant Breeding and Genetics; Plant Sciences
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Fragrance in rice has been shown to result from deletions that cause the loss of function of betaine aldehyde dehydrogenase 2 (BADH2). In many plant species, BADHs play a role in abiotic stress tolerance; in some plants the mechanism by which this occurs is the accumulation of glycinebetaine (GB) from betaine aldehyde. However, rice does not accumulate GB. Rice BADH2 has only moderate activity on betaine aldehyde, with much higher activity on gamma aminobutyraldehyde (GABald). It has been proposed that the primary role of rice BADH2 in vivo is the metabolism of gamma-amino butyric acid (GABA) from GABald. Gamma-amino butyric acid has been shown to perform a range of roles in plants, including assisting in the response to abiotic stress.