AI Article Synopsis
- The study focuses on C Kranz anatomy, highlighting an important feature: an enlarged, photosynthetically active bundle sheath with numerous chloroplasts.
- Researchers aimed to identify new regulators of bundle sheath development using an activation tagging screen, which involved a chloroplast-targeted GFP reporter gene.
- They found a stable mutant with increased GFP fluorescence (named ), but this did not change the bundle sheath structure; the increase in signal was linked to the AT1G29480 locus enhancing the GFP activity through an RNA-based mechanism rather than protein translation.
Article Abstract
A key feature of C Kranz anatomy is the presence of an enlarged, photosynthetically highly active bundle sheath whose cells contain large numbers of chloroplasts. With the aim to identify novel candidate regulators of C bundle sheath development, we performed an activation tagging screen with . The reporter gene used encoded a chloroplast-targeted GFP protein preferentially expressed in the bundle sheath, and the promoter of the C phosphopyruvate carboxylase gene from served as activation tag because of its activity in all chlorenchymatous tissues of . Primary mutants were selected based on their GFP signal intensity, and one stable mutant named with a significant increase in GFP fluorescence intensity was obtained. Despite the increased GFP signal, showed no alterations to bundle sheath anatomy. The causal locus, AT1G29480, is specific to the Brassicaceae with its second exon being conserved. Overexpression and reconstitution studies confirmed that AT1G29480, and specifically its second exon, were sufficient for the enhanced GFP phenotype, which was not dependent on translation of the locus or its parts into protein. We conclude, therefore, that the AT1G29480 locus enhances the GFP reporter gene activity via an RNA-based mechanism.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9576117 | PMC |
| http://dx.doi.org/10.1002/pld3.455 | DOI Listing |
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