Plant hormones are small molecules that play important roles throughout the life span of a plant, known as auxin, gibberellin, cyto- kinin, abscisic acid, ethylene, jasmonic acid, salicylic acid, and brassinosteroid. ...Plant hormones are small molecules that play important roles throughout the life span of a plant, known as auxin, gibberellin, cyto- kinin, abscisic acid, ethylene, jasmonic acid, salicylic acid, and brassinosteroid. Genetic and molecular studies in the model organism Arabidopsis thaliana have revealed the individual pathways of various plant hormone responses. In this study, we selected 479 genes that were convincingly associated with various hormone actions based on genetic evidence. By using these 479 genes as queries, a genome-wide search for their orthologues in several species （microorganisms, plants and animals） was performed. Meanwhile, a com- parative analysis was conducted to evaluate their evolutionary relationship. Our analysis revealed that the metabolisms and functions of plant hormones are generally more sophisticated and diversified in higher plant species. In particular, we found that several phytohor- mone receptors and key signaling components were not present in lower plants or animals. Meanwhile, as the genome complexity in- creases, the orthologue genes tend to have more copies and probably gain more diverse functions. Our study attempts to introduce the classification and phylogenic analysis of phytohormone related genes, from metabolism enzymes to receptors and signaling components, in different species.展开更多
基金supported by the National Science Foundation of China (No.30625003,and 30730011)the China Ministry of Education (No.20060047)
文摘Plant hormones are small molecules that play important roles throughout the life span of a plant, known as auxin, gibberellin, cyto- kinin, abscisic acid, ethylene, jasmonic acid, salicylic acid, and brassinosteroid. Genetic and molecular studies in the model organism Arabidopsis thaliana have revealed the individual pathways of various plant hormone responses. In this study, we selected 479 genes that were convincingly associated with various hormone actions based on genetic evidence. By using these 479 genes as queries, a genome-wide search for their orthologues in several species （microorganisms, plants and animals） was performed. Meanwhile, a com- parative analysis was conducted to evaluate their evolutionary relationship. Our analysis revealed that the metabolisms and functions of plant hormones are generally more sophisticated and diversified in higher plant species. In particular, we found that several phytohor- mone receptors and key signaling components were not present in lower plants or animals. Meanwhile, as the genome complexity in- creases, the orthologue genes tend to have more copies and probably gain more diverse functions. Our study attempts to introduce the classification and phylogenic analysis of phytohormone related genes, from metabolism enzymes to receptors and signaling components, in different species.
