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• W2963581337 abstract "In the plant sterol biosynthetic pathway, sterol 4α-methyl oxidase1 (SMO1) and SMO2 enzymes are involved in the removal of the first and second methyl groups at the C-4 position, respectively. SMO2s have been found to be essential for embryonic and postembryonic development, but the roles of SMO1s remain unclear. Here, we found that the three Arabidopsis (Arabidopsis thaliana) SMO1 genes displayed different expression patterns. Single smo1 mutants and smo1-1 smo1-3 double mutants showed no obvious phenotype, but the smo1-1 smo1-2 double mutant was embryo lethal. The smo1-1 smo1-2 embryos exhibited severe defects, including no cotyledon or shoot apical meristem formation, abnormal division of suspensor cells, and twin embryos. These defects were associated with enhanced and ectopic expression of auxin biosynthesis and response reporters. Consistently, the expression pattern and polar localization of PIN FORMED1, PIN FORMED7, and AUXIN RESISTANT1 auxin transporters were dramatically altered in smo1-1 smo1-2 embryos. Moreover, cytokinin biosynthesis and response were reduced in smo1-1 smo1-2 embryos. Tissue culture experiments further demonstrated that homeostasis between auxin and cytokinin was altered in smo1-1 smo1-2 heterozygous mutants. This disturbed balance of auxin and cytokinin in smo1-1 smo1-2 embryos was accompanied by unrestricted expression of the quiescent center marker WUSCHEL-RELATED HOMEOBOX5. Accordingly, exogenous application of either auxin biosynthesis inhibitor or cytokinin partially rescued the embryo lethality of smo1-1 smo1-2. Sterol analyses revealed that 4,4-dimethylsterols dramatically accumulated in smo1-1 smo1-2 heterozygous mutants. Together, these data demonstrate that SMO1s function through maintaining correct sterol composition to balance auxin and cytokinin activities during embryogenesis." @default.
• W2963581337 created "2019-07-30" @default.
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• W2963581337 date "2019-07-24" @default.
• W2963581337 modified "2023-10-16" @default.
• W2963581337 title "The SMO1 Family of Sterol 4α-Methyl Oxidases Is Essential for Auxin- and Cytokinin-Regulated Embryogenesis" @default.
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• W2963581337 doi "https://doi.org/10.1104/pp.19.00144" @default.
• W2963581337 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6776873" @default.
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