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- W4366998437 abstract "Abstract Ascorbic acid (AA) and AA oxidation play a vital role in plant growth and development. In this research we investigated their role in rice ( Oryza sativa ) root growth. Monitoring of germinating and early vegetative seedlings of the AA biosynthesis mutant vtc1 and its corresponding wild type (WT, ‘Nipponbare’) showed vtc1 mutant with a defect in radicle and early vegetative root growth. AA measurement displayed significantly lower levels of total AA, and mainly lower dehydroascorbic acid (DHA) in the roots of the vtc1 mutant. Phytohormone analysis show roots of the vtc1 mutant with lower levels of Indole-3-acetic acid (IAA) and abscisic acid (ABA). The vtc1 radicle and very early vegetative root phenotype could be complemented by exogenous ABA or auxin (1- naphthalene acetic acid (NAA)) application, but not by AA application. However, at the later vegetative root growth phase only NAA could complement this growth phenotype. Our data revealed that, vtc1 germinating seedling and early vegetative root growth can be complemented by DHA and ascorbate oxidase (AO), the enzyme that oxidizes AA to DHA treatments. Also, these treatments promoted radicle and early vegetative root growth similarly in WT as in the vtc1 -mutant, implicating that these hormones act downstream of AA biosynthesis. Our data show significantly higher concentration of IAA and ABA upon AO treatment in WT seedlings, implicating that AO-induced rice root growth is regulated via auxin and ABA levels. Taken together, these results imply that ascorbate oxidation stimulates rice root growth via positive effects on auxin and ABA levels." @default.
- W4366998437 created "2023-04-27" @default.
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- W4366998437 date "2023-04-25" @default.
- W4366998437 modified "2023-09-23" @default.
- W4366998437 title "Ascorbate oxidation stimulates rice root growth via effects on auxin and abscisic acid levels" @default.
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- W4366998437 doi "https://doi.org/10.21203/rs.3.rs-2827103/v1" @default.
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