Journal de génétique végétale et de sélection

Abstrait

Rice Phenotypic Implications of Tissue Culture-Induced Heritable Genomic Variation

Praveen Shrivastava

Background: Plants that have been regenerated from tissue culture frequently exhibit somaclonal diversity.However, fundamental questions addressing the molecular traits, mutation rates, mutation spectra, and phenotypic significance of plant somatic variation have just lately been addressed. Additionally, these investigations have revealed outcomes that are wildly inconsistent between plant species and even within the same genotype [1].
Methodology/principal findings: An extensively selfed somaclonal line (TC-reg-2008) and its wild type (WT) donor underwent whole genome re-sequencing in order to study heritable genomic variation brought on by tissue culture in rice (cv. Hitomebore). Single nucleotide polymorphisms (SNPs), small-scale insertions/deletions (Indels),and transposable element mobilisation were all calculated (TEs). We evaluated the different genomic variation types' chromosomal distribution, explored the relationships between SNPs and Indels, and looked at the relationshipsbetween TE activity and cytosine methylation states [2]. We also conducted gene ontology (GO) analyses on genes carrying large-effect mutations and nonsynonymous mutations, and we assessed the effects of genomic changes on phenotypes under a variety of abiotic stimuli in addition to normal growth conditions. We discovered that rice had a large amount of heritable somaclonal genomic variation. Each of the 12 rice chromosomes has non-random genomic changes that had an impact on a significant number of functional genes. The conditional dependence of the genetic variants' phenotypic penetrance.
Conclusions/significance: Rice can be genetically modified by tissue culture in a way that differs significantly from natural environments, at least in terms of chromosomal distribution. Our studies have revealed fresh details about the somaclonal variance in rice's mutation rate and spectrum, as well as its chromosomal distribution pattern.Our findings also point to rice's great ability to channelize genetic variants under favourable conditions for maintaining phenotypic robustness, a capacity that, however, can be unleashed in response to certain abiotic challenges toproduce varied phenotypes.