Plants

Cuticular waxes form a crucial hydrophobic barrier on the surface of aboveground organs in terrestrial plants. It strongly influences crop stress tolerance and yield stability, making them important target traits in modern crop breeding. This review systematically summarizes recent advances in how cuticular waxes contribute to crop stress tolerance and yield formation. It covers the chemical composition of cuticular waxes, key pathways and regulatory networks, and the physiological and biochemical mechanisms. In addition, this review highlights the role of cuticle waxes in maintaining crop yield and quality by regulating essential physiological processes, including photosynthetic metabolism and water-use efficiency. Current research indicates that cuticular wax accumulation shows strong crop-specific patterns and is dynamically regulated by environmental factors. Breakthrough studies in major crops have clarified the regulatory mechanisms of several core genes and demonstrated that cuticular waxes enhance stress resistance by strengthening physical barriers, improving water-use efficiency, and protecting photosynthetic structures. A deeper understanding of cuticular wax regulatory mechanisms will help reveal the molecular basis of crop stress resistance and provide both theoretical support and practical guidance for breeding crop varieties with enhanced stress tolerance and stable yields.

Red clover (Trifolium pratense L.) is a rich source of isoflavones with documented antioxidant and skin-protective properties, yet substantial differences in phytochemical composition exist among cultivars. In this study, fourteen T. pratense cultivars were compared with respect to formononetin and biochanin A contents (Milena, Pasieka, Pyza, Milvus, Nemaro, Maro, Larus, Hammon, Vesna, Fregata, Carbo, Forelia, Osimia, and Elanus), and the relationship between isoflavone profiles and skin-related biological activity was evaluated. High-performance liquid chromatography revealed pronounced cultivar-dependent variability with formononetin and biochanin A contents ranging from 1.60 to 7.80 mg/g DW and from 0.69 to 6.44 mg/g DW, respectively. The observed variability was further visualized by principal component analysis. The cultivar with the highest total isoflavone content—Hammon, was selected for biological assessment. Its extract exhibited antioxidant (DPPH IC₅₀ = 0.619 mg/mL; FRAP IC_0.5 = 0.302 mg/mL) and enzyme inhibitory activities (elastase IC₅₀ = 0.602 mg/mL, hyaluronidase IC₅₀ = 22.44 mg/mL), and it significantly enhanced fibroblast migration in an in vitro scratch assay, indicating anti-aging and regenerative potential. These results demonstrate that red clover cultivars differ significantly in their suitability as sources of bioactive isoflavones and highlight the importance of cultivar selection for the development of standardized plant-derived anti-aging ingredients. However, it is worth emphasizing that isoflavones derived from red clover are a valuable group of active compounds with significant potential for topical application as anti-aging and regenerative agents, warranting further formulation development and in vivo validation.

Pseudomonas syringae pv. syringae (Pss) is an economically significant bacterial pathogen that causes canker in sweet cherry trees. In Chile, sweet cherry (Prunus avium L.) is a key crop whose exponential production growth has increased phytosanitary pressure. However, the genetic diversity and adaptive mechanisms of local Pss populations have remained poorly understood. This study characterized 41 Pss isolates from major Chilean production regions. Their genomes were sequenced and compared with 152 public genomes from the PG2 phylogenetic group. The analysis revealed a predominance of the PG2d subgroup among the Chilean isolates, with a population structure defined by at least 18 genomic clusters, some of which are exclusive to Chile. A characteristic feature of this entire PG2d subgroup is the presence of indole-3-acetic acid (IAA) synthesis genes (iaaM and iaaH). Furthermore, this subgroup displayed a marked increase in ancestral gene gain and loss events, indicating extensive remodeling of the shell genome and supporting a model of lineage-specific adaptive evolution. We also identified lineage-specific orthogroups, structural variants of the T-PAI pathogenicity island, and a differential distribution of Hop-type effector proteins. Furthermore, an extended copper resistance operon (cop and cus systems) was detected in a subset of strains, and a dominant lineage was found to have a dual i1-type of T6SS system. These findings highlight the local diversification of Pss in Chile, likely driven by agro-environmental pressures. This study provides crucial insights into the evolution, adaptation, and pathogenic potential of this important pathogen in a crop of high strategic value.