title: Study on relationship between pollen exine ornamentation pattern and germplasm evolution in flowering crabapple.
abstract: Pollen ornamentation patterns are important in the study of plant genetic evolution and systematic taxonomy. However, they are normally difficult to quantify. Based on observations of pollen exine ornamentation characteristics of 128 flowering crabapple germplasms (44 natural species and 84 varieties), three qualitative variables with binary properties (Xi: regularity of pollen exine ornamentation; Yi: scope of ornamentation arrangement regularity; Zi: ornamentation arrangement patterns) were extracted to establish a binary three-dimensional data matrix (XiYiZi) and the matrix data were converted to decimal data through weight assignment, which facilitated the unification of qualitative analysis and quantitative analysis. The result indicates that from species population to variety population and from parent population to variety population, the exine ornamentation of all three dimensions present the evolutionary trend of regular → irregular, wholly regular → partially regular, and single pattern → multiple patterns. Regarding the evolutionary degree, the regularity of ornamentation was significantly lower in both the variety population and progeny population, with a degree of decrease 0.82-1.27 times that of the regularity range of R-type ornamentation. In addition, the evolutionary degree significantly increased along Xi→ Yi→ Zi. The result also has certain reference values for defining the taxonomic status of Malus species.
authors.affiliation: College of Forestry, Nanjing Forestry University, Nanjing 210037, China.|Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.|Yangzhou Crabapple Horticulture Company Limited, Yangzhou 225200, China.
authors.forename: Wang-Xiang
authors.initials: WX
authors.lastname: Zhang
authors.affiliation: College of Forestry, Nanjing Forestry University, Nanjing 210037, China.|Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.|Yangzhou Crabapple Horticulture Company Limited, Yangzhou 225200, China.
authors.forename: Ming-Ming
authors.initials: MM
authors.lastname: Zhao
authors.affiliation: College of Forestry, Nanjing Forestry University, Nanjing 210037, China.|Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Jun-Jun
authors.initials: JJ
authors.lastname: Fan
authors.affiliation: College of Forestry, Nanjing Forestry University, Nanjing 210037, China.|Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhou
authors.affiliation: School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Yong-Xia
authors.initials: YX
authors.lastname: Chen
authors.affiliation: College of Forestry, Nanjing Forestry University, Nanjing 210037, China.|Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Fu-Liang
authors.initials: FL
authors.lastname: Cao
mesh_terms: D005075:Biological Evolution; D002965:Classification; D003627:Data Interpretation, Statistical; D027845:Malus; D008855:Microscopy, Electron, Scanning; D011058:Pollen / Q000502:physiology*; D012016:Reference Values; D012098:Reproduction; D012639:Seeds / Q000502:physiology*; D013045:Species Specificity; D013499:Surface Properties