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Geographic homogeneity and high gene flow of the pear psylla, Cacopsylla pyricola (Hemiptera: Psyllidae), detected by mitochondrial COI gene and nuclear ribosomal internal transcribed spacer 2

Animal Cells and Systems 2012년 16권 2호 p.145 ~ 153
강아랑, 백지연, 이상현, 조영식, 김월수, 한연수, 김익수,
소속 상세정보
강아랑 ( Kang Ah-Rang ) - Chonnam National University College of Agriculture and Life Sciences
백지연 ( Baek Jee-Yeon ) - Chonnam National University College of Agriculture and Life Sciences
이상현 ( Lee Sang-Hyun ) - Chonnam National University Korean Pear Export Research Organization
조영식 ( Cho Young-Sik ) - Rural Development Administration National Institute of Horticultural and Herbal Science
김월수 ( Kim Wol-Soo ) - Chonnam National University College of Agriculture and Life Sciences
한연수 ( Han Yeon-Soo ) - Chonnam National University College of Agriculture and Life Sciences
김익수 ( Kim Ik-Soo ) - Chonnam National University College of Agriculture and Life Sciences

Abstract


The pear psylla, Cacopsylla pyricola (Hemiptera: Psyllidae), is a serious insect pest of commercial pear crops. The species, which resides on pear trees throughout its life cycle, is rapidly spreading in some regions of the world. The population genetic structure of the species collected from several pear orchards in Korea was studied to understand the nature of dispersal and field ecology of the species. The 658-bp region of mitochondrial COI gene and the 716-bp long complete internal transcribed spacer 2 (ITS2) of the nuclear ribosomal DNA were sequenced. Unlike other previously studied insect pests, the COI-based genetic diversity of the pear psylla was extremely low (maximum sequence divergence of 0.15%). This finding allowed us to conclude that the species may have been introduced in Korea relatively recently. ITS2 sequence-based analyses of phylogeny, population differentiation, gene flow, and hierarchical population structure all concordantly suggested that the pear psylla populations in Korea are neither genetically isolated nor hampered for gene flow. These genetic data are concordant with the dispersal of an overwintering winterform morph outside the non-pear habitat in the fall.

키워드

pear psylla; Cacopsylla pyricola; mitochondrial COI gene; ITS2; genetic homogeneity; gene flow

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