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• W2158463977 abstract "Homeotic conversions of anthers were found in cytoplasmic male sterile (CMS) plants of Brassica napus derived from somatic hybrids of B. napus and Arabidopsis thaliana. CMS line flowers displayed petals reduced in size and width and stamens replaced by carpelloid structures. In order to investigate when these developmental aberrations appeared, flower development was analysed histologically, ultrastructurally and molecularly. Disorganized cell divisions were detected in the floral meristems of the CMS lines at stage 4. As CMS is associated with mitochondrial aberrations, ultrastructural analysis of the mitochondria in the floral meristems was performed. Two mitochondrial populations were found in the CMS lines. One type had disrupted cristae, while the other resembled mitochondria typical of B. napus. Furthermore, expression patterns of genes expressed in particular floral whorls were determined. In spite of the aberrant development of the third whorl organs, BnAP3 was expressed as in B. napus during the first six stages of development. However, the levels of BnPI were reduced. At later developmental stages, the expression of both BnAP3 and BnPI was strongly reduced. Interestingly the expression levels of genes responsible for AP3 and PI activation such as LFY, UFO and ASK1 were higher in the CMS lines, which indicates that activation of B-genes in the CMS lines does not occur as in B. napus. Disrupted and dysfunctional mitochondria seem to be one of the first aberrations manifested in CMS which result in a retrograde influence of the expression levels of genes responsible for the second and third whorl organ differentiation." @default.
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• W2158463977 date "2005-04-01" @default.
• W2158463977 modified "2023-10-10" @default.
• W2158463977 title "Expression levels of meristem identity and homeotic genes are modified by nuclear-mitochondrial interactions in alloplasmic male-sterile lines of Brassica napus" @default.
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• W2158463977 doi "https://doi.org/10.1111/j.1365-313x.2005.02407.x" @default.
• W2158463977 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15918886" @default.
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