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- W2169066075 abstract "The number of nodules that form in a legume when interacting with compatible rhizobia is regulated by the plant. We report the identification of a mutant in nodule regulation in Medicago truncatula, like sunn supernodulator (lss), which displays shoot-controlled supernodulation and short roots, similar to sunn mutants. In contrast with the sunn-1 mutant, nodulation in the lss mutant is more extensive and is less sensitive to nitrate and ethylene, resembling the sunn-4 presumed null allele phenotype. Although the lss locus maps to the SUNN region of linkage group 4 and sunn and lss do not complement each other, there is no mutation in the genomic copy of the SUNN gene or in the 15-kb surrounding region in the lss mutant. However, expression of the SUNN gene in the shoots of lss plants is greatly reduced compared with wild-type plants. Analysis of cDNA from plants heterozygous for lss indicates that lss is a cis-acting factor affecting the expression of SUNN, and documented reversion events show it to be unstable, suggesting a possible reversible DNA rearrangement or an epigenetic change in the lss mutant. Assessment of the SUNN promoter revealed low levels of cytosine methylation in the 700-bp region proximal to the predicted transcription start site in both wild-type and lss plants, indicating that promoter hypermethylation is not responsible for the suppression of SUNN expression in lss. Thus, lss represents either a distal novel locus within the mapped region affecting SUNN expression or an uncharacterized epigenetic modification at the SUNN locus." @default.
- W2169066075 created "2016-06-24" @default.
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- W2169066075 date "2010-09-22" @default.
- W2169066075 modified "2023-10-11" @default.
- W2169066075 title "The <i>lss</i> Supernodulation Mutant of <i>Medicago truncatula</i> Reduces Expression of the <i>SUNN</i> Gene" @default.
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- W2169066075 doi "https://doi.org/10.1104/pp.110.164889" @default.
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