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종자 휴면과 수발아성에 대한 양적형질 (QTL) 유전자 연구 동향

Quantitative Trait Loci (QTL) Genes Related to Seed Dormancy and Preharvest Sprouting

한혜주|이강섭|김범기|윤인선|권택윤|허선미
한국육종학회 (The Korean Society of Breeding Science)|2016.03|한국육종학회지 (KOREAN JOURNAL OF BREEDING SCIENCE)|제48권 제1호|pp. 1-10|DOI http://dx.doi.org/10.9787/KJBS.2016.48.1.001

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참고문헌

키워드

ArabidopsisSeed dormancyPreharvest sprouting (PHS)Quantitative trait loci (QTL)Cereal crops
주제분류농학

초록

종자의 휴면은 식물이 생존에 적합한 환경에서 생활사를시작하기 위해 진화적으로 적응한 중요한 생존전략이다. 야생종의 종자가 강한 휴면성을 보이는 것과는 달리, 재배작물의종자는 경작의 편의성을 위해서 종자 휴면성을 약화하는 방향으로 육종되어 왔다. 반면 수확기 종자의 휴면성이 약하면다습한 조건에서 종자가 이삭에 달린 채로 발아하는 수발아가 발생할 수 있다. 밀 등 주요 곡물의 수발아는 전 세계적으로 심각한 경제적 손실을 발생하고 있는 상황이다. 종자의 휴면성은 복합적인 유전적 환경적 인자에 의해 조절되는 양적형질(QTL)이다. 지금까지 밀, 벼 등 곡물과 모델 식물인 애기장대에서 수십 개 이상의 종자 휴면 QTL이 보고되었으며 작물 유전체 연구의 발전에 의해 QTL 유전자 규명이 가속화되고 있다. 본고에서는 애기장대와 작물의 종자휴면 QTL 유전자 연구동향을 살펴보았다.

Abstract

Seed dormancy is an important adaptive mechanism to protect seeds under the unfavorable environments. Unlike to wild type species, the seed dormancy trait of cultivated crops has been weakened by breeding programs during the domestication period. Weak seed dormancy often causes preharvest sprouting (PHS) problem in many cereal crops that result in significant economic loss. The seed dormancy is a quantitative trait loci (QTL) controlled by multiple genetic and environmental factors. So far, many QTLs for seed dormancy have been identified from rice and wheat as well as in the model plant Arabidopsis. Unveiling of QTL genes and complex mechanisms underlying seed dormancy is accelerated by the rapid progress of crop genomics. In the present study, we reviewed current status of research progress on the seed dormancy QTLs and correlated genes in Arabidopsis and cereal crops.

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