Population Structure and Genetic Diversity of Colletotrichum gloeosporioides on Citrus in China

To analyze the genetic structure and diversity of Colletotrichum gloeosporioides as dominant species on Citrus, Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) diversity, including 63 strains isolated selected from 8 different sites 5 citrus species, was studied. A total 19 GAPDH haplotypes were identified by analysis, main haplotype (haplotype 5) distributed in 28 isolates, mainly Citrus unchiu Hort. ex Tanaka (WG) reticulata Blanco cv. Succosa (BDZ) Huangyan (HY), Linhai (LH), Jiande (JD) Zhejiang province, Mashui tangerine (MSJ) Mengshan Guangxi province (GX). Using differentiation index, Fst revealed significant C. populations between Jiangxi (JXGZ) GX, HY, LH, JD, Chun’an (CA) also slightly less for Shaanxi (SX), Quzhou (QZ) province. In addition, great obtained MSJ paradise Macf (PTY), weak sinensis Osbeck (QC), WG, BDZ. The AMOVA test showed that levels 19% 81% among within geographic populations, respectively. It had host 12% 88%, Mantel distance not linearly correlated with geographical phylogenetic analysis regions hosts scattered tree, implying independent variety origin. We speculated may be due to gene mutation, recombination, or migration native has nothing do natural selection triggered geography variety.