Characterization of the ddt1 Mutant in Rice and Its Impact on Plant Height Reduction and Water Use Efficiency
Rice ( L.), a fundamental global staple, nourishes over half of the world's population. The identification of the mutant in rice through EMS mutagenesis of the cultivar Shuhui527 revealed a dwarf phenotype, characterized by reduced plant height, smaller grain size, and decreased grain weight. D...
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Published in | International journal of molecular sciences Vol. 25; no. 14; p. 7629 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Switzerland
MDPI AG
11.07.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Rice (
L.), a fundamental global staple, nourishes over half of the world's population. The identification of the
mutant in rice through EMS mutagenesis of the
cultivar Shuhui527 revealed a dwarf phenotype, characterized by reduced plant height, smaller grain size, and decreased grain weight. Detailed phenotypic analysis and map-based cloning pinpointed the mutation to a single-base transversion in the
gene, encoding a cytochrome P450 enzyme, which results in a premature termination of the protein. Functional complementation tests confirmed
as the
gene responsible for the observed phenotype. We further demonstrated that the
mutation leads to significant alterations in gibberellic acid (GA) metabolism and signal transduction, evidenced by the differential expression of key GA-related genes such as
,
, and
. The mutant also displayed enhanced drought tolerance, as indicated by higher survival rates, reduced water loss, and rapid stomatal closure under drought conditions. This increased drought resistance was linked to the mutant's improved antioxidant capacity, with elevated activities of antioxidant enzymes and higher expression levels of related genes. Our findings suggest that
plays a crucial role in regulating both plant height and drought stress responses. The potential for using gene editing of
to mitigate the dwarf phenotype while retaining improved drought resistance offers promising avenues for rice improvement. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1422-0067 1661-6596 1422-0067 |
DOI: | 10.3390/ijms25147629 |