감자 유전자원의 더뎅이병 저항성 평가
Evaluation of Common Scab (Streptomyces scabeis) Resistance of Potato Germplasm
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감자 더뎅이병 저항성 육종프로그램에 교배양친으로 활용하기 위한 저항성 유전자원을 선발하기 위하여 다양한 유전적 배경을 가진 국내외 수집 품종 및 계통 168종에 대하여 더뎅 이병 발생빈도가 높은 시험포장에서 포장저항성을 검정하였다. 1년차 포장저항성 검정시험을 통하여 더뎅이병 발병률이 낮은 64계통을 선발하였다. 2년차에는 선발계통을 중심으로 반 복시험 및 집중적인 포장저항성을 다각도로 평가하였다. 그 결과 공시된 계통들 중 88K77-1 및 AG34265는 발병도가 각각 0 및 3.6%로 고도의 저항성(HR)을 나타냈고, AG14188 등 6 계통은 발병도가 10.0~18.0%로 저항성 계통(R)으로 분류되었다. Hertha 등 7계통은 발병도가 21.4~41.3%로 중도 저항성(MR)을 보였으며, W718 등 나머지 29계통은 발병도가 63.3~99.0%로서 감수성 유전자원(S)으로 평가되었다. 대비품종으로 사용된 대지 품종의 발병도는 98.9%, 대서 품종은 78.7%, 수미 품종은 17.0%였다. 표피의 형태에 따른 더뎅이병의 발병률과 발병도는 그물망 표피 형태를 가진 계통의 경우, 78.4%와 53.5%로서 매끄러운 형태의 표피를 가진 계통의 95.5%와 66.1%에 비해 낮게 나타났으나 통계적인 유의성은 없었다.
Abstract
Total 168 clones or varieties which were collected from abroad or bred in Korea were evaluated for their field resistanceto comon scab (Streptomyces scabies) in the test field which were highly contaminated with pathogen in order to select resistantparents for potato breeding program. From first evaluation in 2003, 64 genotypes which showed the low rates of scab incidencewere screened as tentative resistant germplasm. In the following year, they were re-evaluated in the same test field with three repli-cated trials and intensive measurements. From the test, 88K77-1 and AG34265 were selected as highly resistant (HR) genotypel-atively low severity, 7 clones including Hertha as moderately resistant (MR) genotype with 21.4~41.3% of the severity, and sub-sequently, 29 clones including W718 as susceptible genotype group with more than 63.3% of the severity. The disease severitiesof Dejima, Atlantic, and Superior used as control varieties were 98.9%, 78.7%, and 17.0%, respectively. The diferent inci-dence rates and severities of scab were also shown by tuber skin types of the genotypes evaluated; 78.4% and 53.5% in the russet-skinned group, and 95.5% and 66.1% in smooth-skinned group, respectively, but no significance was found.
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