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- Title
Metabolism of abscisic acid in two contrasting rice genotypes submitted to recurrent water deficit.
- Authors
Ariane Auler, Priscila; Nogueira do Amaral, Marcelo; Rossatto, Tatiana; Lopez Crizel, Rosane; Milech, Cristini; Clasen Chaves, Fabio; Maia Souza, Gustavo; Bolacel Braga, Eugenia Jacira
- Abstract
Drought is the main constrain for crops worldwide, however, the effects of recurrent water deficit remain still hidden. We analysed two rice genotypes, 'BRS-Querência' (lowlands) and 'AN-Cambará' (uplands), after 7 days of recurrent drought followed by 24 h of rehydration, hypothesising that genotypes grownin regionswithdifferentwateravailabilities responddifferently to water deficits, and that a previous exposure to stress could alter abscisic acid (ABA) metabolism. The results showed that both genotypes reducedstomatal conductance andincreasedABAconcentration. After rehydration, theABAlevelsdecreased, mainly in theplantsofBRS-Querênciasubjected to recurrent stress. However, the levels of ABA were higher in plants in recurrentwater deficit compared to non-recurrent stress plants in both genotypes. Remarkably in the lowland genotype, the ABA glucosyl-ester (ABAGE) concentrationincreasedafter recovery in theplantsunder recurrent stress. Regarding of gene expression, the genes associated in ABA biosynthesiswith the highest expression levels were NCED2, NCED3, NCED4 and AAO2. However, 'AN-Cambará' showed less transcriptional activation. Taking into account the genes involved in ABA catabolism, ABAH1 appears to play an important role related to the recurrent stress in upland plants. These results indicate that one of the factors that can promote greater tolerance for the upland genotype is the tradeoff between ABA and ABA-GE when plants are subjectedtowater deficits. Inaddition, they indicate thatabscisic acidmetabolismis altered due to the genotype (upland or lowland) and pre-exposure to stress can alsomodify adaptive responses in rice varieties (recurrent stress).
- Subjects
GENOTYPES; ABSCISIC acid; GENE expression; RICE; METABOLISM; UPLANDS
- Publication
Physiologia Plantarum, 2021, Vol 172, Issue 2, p304
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/ppl.13126