Tropical Plant Pathology (2016) 41, 237-245

Chun-Hui Zhao, Yi-Hua Lin, Yong-Bao Pan, Hua-Ying Fu, Ru-Kai Chen, Michael Paul Grisham, Yu Li and San-Ji Gao (2016)
Population structure and selection pressure analysis among Sugarcane yellow leaf virus isolates based on P0 and P1 sequences
Tropical Plant Pathology 41 (4), 237-245
Abstract: Yellow leaf of sugarcane is caused by Sugarcane yellow leaf virus (SCYLV) and has been a threat to global sugar industry. Understanding the diversity and genetic structure of plant virus populations may help to develop strategies to control virus-induced diseases. In this study, demography, genetic differentiation and selection pressure were assessed based on 57 nucleotide sequences of the P0 (567 nt) and 54 nucleotide sequences of the P1 (1413 nt) genes of SCYLV isolates. Phylogenetic analysis revealed three phylogeographical groups: African (Clade I), Chinese/American (Clade II), and Asian (Clade III). Genetic distance values between groups (0.034–0.250) were higher than within-group values (0.011–0.033). The African group was in a state of expansion, with lower nucleotide sequence diversity. Except for those isolates within the Asian group, SCYLV showed infrequent gene flow within or between phylogenetic groups. Analysis of selection pressure suggested that these two genes have been subjected to negative (purifying) selection. However, some sites, especially in the P0 coding region of the Chinese/American group, have undergone positive selection. Overall, aside from recombination and founder effects, gene flow and purifying selection are two important factors driving SCYLV evolution.
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(original language: English)
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Database assignments for author(s): Yong-Bao Pan

Research topic(s) for pests/diseases/weeds:
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Sugarcane yellow leaf virus	Sugarcane (Saccharum officinarum)