ORCID Profile
0000-0001-8812-6481
Current Organisations
Hainan University
,
University of Narowal
,
Karolinska Institutet
,
Science for Life Laboratory
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Publisher: Elsevier BV
Date: 11-2006
DOI: 10.1016/J.TIG.2006.09.002
Abstract: We present a statistical analysis of chromosomal clustering among nuclear genes encoding mitochondrial or chloroplast proteins in Arabidopsis. For both organelles, the clustering was significantly increased above the expectation, but the clustering effect was weak, and most clusters were small and dispersed. Clustered genes showed coexpression but not more than expected, and no substantial synteny was detected in other eukaryotic genomes. We propose that the unexpected clustering results from continuous selection favoring chromosomal proximity of genes acting in the same organelle.
Publisher: Oxford University Press (OUP)
Date: 06-09-2022
Abstract: The rhizosheath is a belowground area that acts as a communication hub at the root–soil interface to promote water and nutrient acquisition. Certain crops, such as white lupin (Lupinus albus), acquire large amounts of phosphorus (P), owing partially to exudation of acid phosphatases (APases). Plant growth-promoting rhizobacteria also increase soil P availability. However, potential synergistic effects of root APases and rhizosheath-associated microbiota on P acquisition require further research. In this study, we investigated the roles of root purple APases (PAPs) and plant growth-promoting rhizobacteria in rhizosheath formation and P acquisition under conditions of soil drying (SD) and P treatment (+P: soil with P fertilizer –P: soil without fertilizer). We expressed purple acid phosphatase12 (LaPAP12) in white lupin and rice (Oryza sativa) plants and analyzed the rhizosheath-associated microbiome. Increased or heterologous LaPAP12 expression promoted APase activity and rhizosheath formation, resulting in increased P acquisition mainly under SD–P conditions. It also increased the abundance of members of the genus Bacillus in the rhizosheath-associated microbial communities of white lupin and rice. We isolated a phosphate-solubilizing, auxin-producing Bacillus megaterium strain from the rhizosheath of white lupin and used this to inoculate white lupin and rice plants. Inoculation promoted rhizosheath formation and P acquisition, especially in plants with increased LaPAP12 expression and under SD–P conditions, suggesting a functional role of the bacteria in alleviating P deficit stress via rhizosheath formation. Together, our results suggest a synergistic enhancing effect of LaPAP12 and plant growth-promoting rhizobacteria on rhizosheath formation and P acquisition under SD–P conditions.
Publisher: Springer Science and Business Media LLC
Date: 08-05-2017
Abstract: Understanding complex biological systems requires functional characterization of specialized tissue domains. However, existing strategies for generating and analysing high-throughput spatial expression profiles were developed for a limited range of organisms, primarily mammals. Here we present the first available approach to generate and study high-resolution, spatially resolved functional profiles in a broad range of model plant systems. Our process includes high-throughput spatial transcriptome profiling followed by spatial gene and pathway analyses. We first demonstrate the feasibility of the technique by generating spatial transcriptome profiles from model angiosperms and gymnosperms microsections. In Arabidopsis thaliana we use the spatial data to identify differences in expression levels of 141 genes and 189 pathways in eight inflorescence tissue domains. Our combined approach of spatial transcriptomics and functional profiling offers a powerful new strategy that can be applied to a broad range of plant species, and is an approach that will be pivotal to answering fundamental questions in developmental and evolutionary biology.
No related grants have been discovered for Andrey Alexeyenko.