Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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A Study of the Defense Mechanism against Herbivores of 8 Species of the Genus Acer

단풍나무류 8종의 초식에 대한 방어전략 탐색

  • Kim, Gab-Tae (Dept. of Forest Sciences, College of Life Sci. & Resour., Sangji Univ.) ;
  • Lyu, Dong-Pyo (Dept. of Forest Sciences, College of Life Sci. & Resour., Sangji Univ.) ;
  • Kim, Hoi-Jin (Dept. of Forest Sciences, Graduate school, Seoul Natl. Univ.)
  • 김갑태 (상지대학교 산림자원학과) ;
  • 류동표 (상지대학교 산림자원학과) ;
  • 김회진 (서울대학교 대학원 산림자원학과)
  • Published : 2009.10.31
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Abstract

This research is intended to discover physiological and biochemical defense mechanisms against herbivores of 8 species of the genus Acerby examining the morphological characteristics of the leaf, the structure and number of leaf domatia, herbivores insects and mites feeding on leaves, which were collected from the trees growing in Mt. Chiak, Mt. Cheongtae, Mt. Jungwang, Mt. Bangtae, Mt. Taebaek and Wonju City. This research was conducted from May through July, 2009, and the results are as follows. The domatia of A. pseudosieboldianum, A. pictum subsp. mono and A. mandshuricum belongs to tuft type; that of A. palmatum, A. triflorum and A. tschonoskii pocket+tuft type; and that of A. tegmentosum pocket type. The number of domatia per leaf turned out to be the highest in the case of A. tegmentosum(20.2), and the lowest in the case of A. ginnala (4.2). Leaf surface trichomes of A. palmatum, A. pseudosiebotdianum, A. ginnala and A. mandshuricum are covered with villi; those of A. pictum subsp. mono and A. triflorum with soft, pilose type of hair, and those of A. tschonoskii with stiff, strigose hair. The trichome density of lower leaf surface is found to be higher than that of the upper leaf surface. Only in the case of A. palmatum, A. pseudosieboldianum, A. tegmentosum and A. tschonoskii, a small amount of nectar is found to be secreted from the distal vein parts of the leaf margin. The number of mites on each leaf are found to be significantly different among tree species, and average mites number per leaf was the highest in the case of A. tschonoskii (9.2/leaf), and A. mandshuricum, A. pseudosieboldianum, and A. triflorum follow it in decreasing order. Minute insects attacking the leaf of Acer spp. include Periphyllus californiensis, P. viridis, Psylla spp, and gall mites, and the number of these insects are found in Periphyllus californiensis, Psylla spp, P. viridis, and Cicadellidae sp. in decreasing order. The natural enemies of these herbivores insects are predatory mites, such as Chilocorus rubidus, Coccinella septempunctata and the nymph, Aphidius ervi, Poecilocoris lewisi and its larva, and Poecilocoris lewisi. Lasius japonicus and Formica japonica are symbiotic with aphids, and supports herbivores. Finally, our research confirmed that predatory mites attack Periphyllus californiensis and suck the body fluid of their victim. This proves that mites form a symbiotic relationship with plants through the mediation of leaf domatia. This also indicates that a protective mutualism may be more conspicuous in temperate broad-leaved trees.

목본식물의 초식에 대한 방어 전략을 알아보고자 8종의 단풍나무속 수종의 잎에 대하여 형태적 특성, domatia 구조와 수, 초식곤충과 응애 서식 여부 등을 관찰 조사하였다. 조사대상 수목들은 강원도 치악산, 청태산, 방태산, 태백산과 윈주시에 생육 중인 8수종에서 엽시료를 채취하여 2009년 4월부터 7월까지 관찰, 조사하였다. 얻어진 결과는 다음과 같다. 당단풍, 고로쇠 및 복장나무의 domatia는 tuft type, 단풍나무, 신나무, 복자기와 시닥나무는 pocket+tuft type, 산겨릅나무는 pocket type 임이 밝혀졌다. 엽당 domatia 평균 갯수는 산겨릅나무에서 20.2개/엽으로 가장 많았고, 신나무에서 4.2개/엽으로 가장 적었다. 엽표면의 털은 단풍나무, 당단풍, 신나무 및 복장나무는 응모(villous), 고로쇠나무와 복자기는 연모(pilose), 시닥나무는 강모(strigose)였다. 일반적으로 털의 밀도는 잎 뒷면이 앞면보다 높았다. 단풍나무, 당단풍, 산겨릅나무 및 시닥나무에서만 엽맥의 말단부에 소량의 단물이 분비됨을 확인하였다. 엽당 응애의 개체수는 수종간 고도의 통계적 유의성이 인정되었으며, 엽당 응애 개체수 평균은 시닥나무가 9.2마리로 가장 많았으며, 다음으로 복장나무, 당단풍, 복자기가 순이었다. 단풍나무류 잎을 가해하는 미소절지동물류는 진사진딧물, 단풍알락진딧물, 나무이, 혹응애, 매미충 등이었으며, 총개체수는 혹응애, 진사진딧물, 나무이, 단풍알락진딧물, 매미충 순이었다. 이들의 천적으로는 육식성 응애, 말벌, 그 약충, 광대노린재 약충, 등이 확인되었으며, 고동털개미와 곰개미는 진딧물과 상리공생을 하여 단풍나무류의 초식피해를 가중시킴을 확인하였다. 육식성 응애가 진사진딧물을 공격하여 체액을 빨아먹는 것을 확인하였으면, 이는 domatia가 중재하는 응애와 식물의 상리공생의 증거라 판단된다. 이러한 결과는 온대 활엽수종에서 이러한 응애와의 상리공생이 보편화되어 있음을 암시하는 것이라 사료된다.

Keywords

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