국내 재래종 상추 유전자원의 내염성 평가
Evaluation of Salt Tolerance in Lettuce Landraces from Korea
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초록
염 스트레스는 상추의 생산량과 품질에 영향을 미치는 중요한제한요소 중 하나이다. 본 실험에서는 내염성이 높은 상추 개발을위한 기초소재를 찾는 것으로 목적으로, 32개의 국내 재래종상추 계통들을 대상으로 몇 가지 농도의 염화나트륨 처리(NaCl 0, 100, 200mM)에 따른 전해질 누출과 생장 특성에 미치는영향을 평가하였다. 전해질 누출 함량 결과를 사용하여 군집분석을 실시한 결과 'IT105183'과 'IT195057' 계통이 실험에 이용된계통들 중 가장 강한 내염성을 가지고 있는 것으로 밝혀졌다. 또한, 염 처리는 상추의 성장을 저해하였지만, 성장의 저해 정도는 내염성이 강한 계통들이 내염성이 약한 계통들에 비해서낮은 것으로 나타났다. 따라서, 국내 재래종 상추 계통 중 일부는 내염성이 강한 새로운 상추 품종을 육성하는데 있어 유용하게 이용 될 수 있을 것으로 기대된다.
Abstract
Salt stress is one of major restrictions for the production of lettuce. In order to identify promising lettuce genotypes having tolerance against salt stress, effect of different sodium chloride (NaCl) concentrations (0, 100, and 200 mM) on electrolyte leakage and growth of thirty-two lettuce landraces from Korea was evaluated. Screening salt tolerant genotypes based on cluster analysis using data of electrolyte leakage discriminated 'IT105183' and 'IT195057' as the most salt tolerant landraces. More importantly, salinity significantly reduced growth of lettuce, but the reduction rates of growth caused by salt stress in salt-tolerant genotypes were much smaller than those in salt-sensitive genotypes. These results indicate that 'IT105183' and 'IT195057' have high potential for being used as parents to improve salt tolerance in other lettuce cultivars.
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