Reading Date: February 24, 2026
This study investigates the evolutionary and breeding history of wheat and barley by examining patterns of convergent selection across their genomes. Through comparative genomic analyses, the authors demonstrate that despite their independent domestication histories, wheat and barley experienced strikingly similar selection pressures during domestication and modern improvement. The results reveal shared genomic regions under selection, particularly those associated with agronomic traits such as yield components, adaptation, and stress responses. These findings suggest that breeding has repeatedly targeted similar biological pathways across related cereal crops. By identifying conserved selection signatures, the study provides valuable insights for future crop improvement and highlights the potential of leveraging parallel evolutionary trajectories to accelerate molecular breeding strategies
Reading Date: February 22, 2026
This review discusses how alternative splicing (AS) shapes transcriptome and proteome dynamics in plants, particularly under stress conditions. Although AS is widespread, its direct contribution to proteome complexity remains debated due to limited proteomic detection and the frequent degradation of splice variants via nonsense-mediated decay (NMD). The authors propose that AS may primarily function to enhance regulatory flexibility rather than simply increase protein diversity. Many stress-induced splice variants encode intrinsically disordered proteins (IDPs) or intrinsically disordered regions (IDRs), which expand interaction capacity and regulatory potential with lower metabolic cost. The paper also highlights the interplay between chromatin state, RNAPII dynamics, and photoperiod-dependent translation (translational coincidence), suggesting that AS integrates environmental signals to fine-tune gene expression. Overall, this study reframes AS as a mechanism for dynamic regulatory control and stress adaptation rather than merely a generator of protein isoform diversity.
Reading Date: February 22, 2026
Springer and colleagues review how chromatin modifications shape genome organization and phenotypic variation in plants with complex, TEs-rich genomes. The authors highlight the dynamic interplay between transposable elements (TEs), whole-genome duplication (WGD), and epigenetic regulation, emphasizing how these processes collectively influence gene expression and genome evolution. They compare species-specific differences in DNA methylation patterns, such as low CHH methylation levels in maize versus higher CHH methylation in Arabidopsis, illustrating how epigenomic landscapes vary across plant lineages. The review further explains how TE activity potentially stimulated by abiotic stress, viral infection, chromosomal breaks, or horizontal transfer can alter gene function through insertion into genic regions, heterochromatin formation, novel promoter creation, and the emergence of new regulatory elements. Overall, the paper provides a conceptual framework for understanding how epigenetic regulation creates order within structurally complex plant genomes.
Edger and colleagues generated the first chromosome-scale assembly of the cultivated octoploid strawberry (Fragaria × ananassa), providing a comprehensive framework to resolve its complex allopolyploid origin. Phylogenomic analyses identified the extant relatives of each diploid progenitor species and supported a North American origin of the octoploid lineage. Comparative analyses among the four subgenomes revealed clear subgenome dominance, with a single F. vesca-like subgenome exhibiting reduced transposable element density, greater gene retention, elevated gene expression, and biased homoeologous exchanges relative to the other ancestral subgenomes. These patterns are consistent with biased fractionation following polyploidization and demonstrate how genome dominance can shape gene content, regulatory architecture, and agronomically important traits in recently formed polyploid crops.
This study presents a powerful alternative to traditional GWAS for dissecting the genetic architecture of gene expression and agronomic traits. Conventional SNP-based association methods rely largely on linkage disequilibrium, which often conflates correlation with causation and limits the identification of true regulatory variants. To address this, Wei et al. (2025) employ a k-mer–based Bayesian framework (K-PROB) that leverages pan-genomic and pan-transcriptomic data without reliance on a single reference genome. This approach enables the direct prioritization of causal cis-regulatory elements, many of which are embedded within complex structural variation and therefore inaccessible to standard GWAS. Importantly, K-PROB uncovers previously unknown regulatory motifs that drive natural variation in gene expression and key agronomic traits.
This study investigates the evolutionary history of green plants using vegetative transcriptomes from 1,124 species, providing one of the most comprehensive phylogenomic frameworks to date. The results demonstrate that whole-genome duplication (WGD) events are substantially more frequent in land plants than in algae and have played a central role in shaping gene evolution and plant diversification. Genome duplication and subsequent gene-family expansion emerge as major drivers of evolutionary innovation, particularly during key transitions such as the origin of vascular plants, where the largest gene-family expansions were observed. The study further shows that discordance between gene trees and the inferred species tree is largely explained by extensive gene duplication and loss, as well as rapid diversification events. Collectively, these findings highlight how polyploidy and gene-family dynamics have underpinned the evolutionary success and ecological adaptability of green plants.
Hailin Liu and colleagues from the Chinese Academy of Agricultural Sciences assembled a nearly complete genome of Ginkgo biloba using PacBio long-read sequencing combined with Hi-C technology. The genome size was approximately 9.88 Gb, providing a high-quality reference for gymnosperm research. One of the most interesting findings of this study concerns the evolution of the sperm flagellum. By comparing Ginkgo with cryptogamous plants and other seed plants, the authors showed that candidate genes related to the central pair, intraflagellar transport, and dynein proteins are retained in Ginkgo, as in cryptogamous plants. In contrast, these genes are lost in other seed plants. This suggests that Ginkgo preserved ancestral genetic components required for sperm flagellum formation. In addition, the absence of true flowers in Ginkgo was explained by the lack of key MADS-box genes involved in floral organ development, such as members of the APETALA and SEPALLATA families. The study also clarified that the Ginkgo genome experienced the ancient seed plant whole-genome duplication but no lineage-specific duplication events.Overall, this paper is an excellent example of how high-quality genome assemblies can help us understand the evolutionary history of plant organs through the functional analysis of genes.