Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Isolation and characterization of Auxin/indole-3-acetic acid 1 (Aux/IAA1) gene from poplar (Populus alba × P. glandulosa)

현사시나무에서 Auxin/indole-3-acetic acid 1 (Aux/IAA1) 유전자 분리 및 발현 특성 구명

  • Bae, Eun-Kyung (Forest Biotechnology Division, National Institute of Forest Science) ;
  • Choi, Young-Im (Forest Biotechnology Division, National Institute of Forest Science) ;
  • Lee, Hyoshin (Forest Bioinformation Division, National Institute of Forest Science) ;
  • Choi, Ji Won (Forest Biotechnology Division, National Institute of Forest Science)
  • 배은경 (국립산림과학원 산림생명공학연구과) ;
  • 최영임 (국립산림과학원 산림생명공학연구과) ;
  • 이효신 (국립산림과학원 산림생명정보연구과) ;
  • 최지원 (국립산림과학원 산림생명공학연구과)
  • Received : 2019.08.10
  • Accepted : 2019.09.09
  • Published : 2019.09.30
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Abstract

Auxin plays a crucial regulatory role in plant growth and development processes. Three major classes of auxin-responsive transcription factors controlled by the Auxin/indole-3-acetic acid (Aux/IAA), Gretchen Hagen 3 (GH3), and small auxin up RNA (SAUR) genes regulate auxin signaling. Aux/IAA, in particular, encodes short-lived nuclear proteins that accumulate rapidly in response to auxin signaling. In this study, we isolated a PagAux/IAA1 gene from poplar (Populus alba ${\times}$ P. glandulosa) and investigated its expression characteristics. The PagAux/IAA1 cDNA codes for putative 200 amino acids polypeptide containing four conserved domains and two nuclear localization signals (NLSs). Utilizing Southern blot analysis, we confirmed that a single copy of the PagAux/IAA1 gene was present in the poplar genome. The expression of this gene is specific to leaves and flowers of the poplar. PagAux/IAA1 expressed in the early exponential growth phase of cell-cultured in suspension. PagAux/IAA1 expression level reduced in drought and salt stress conditions, and the presence of plant hormones such as abscisic acid. However, expression enhanced in cold stress, cambial cell division, and presence of plant hormones such as gibberellic acid and jasmonic acid. Thus, these results suggest that PagAux/IAA1 participates in cold stress response as well as developmental processes in the poplar.

옥신은 식물의 생장과 발달 과정에서 중요한 조절자로서 기능한다. 옥신 신호전달 과정은 3개의 주요 옥신 반응 전사인자인 Auxin/indole-3-acetic acid (Aux/IAA), Gretchen Hagen 3 (GH3), 그리고 small auxin up RNA (SAUR) 유전자에 의해 조절된다. 특히, Aux/IAA는 옥신 신호에 반응하여 빠르게 축적되는 수명이 짧은 핵 단백질이다. 이 실험에서 우리는 현사시 나무(Populus alba ${\times}$ P. glandulosa)로 부터 PagAux/IAA1 유전자를 분리하고 발현 특성을 분석하였다. PagAux/IAA1 cDNA는 4개의 보존된 도메인과 2개의 nuclear localization sequence (NLS)을 포함한 200개의 아미노산을 암호화하고 있다. Southern blot 분석으로 현사시나무 genome에 PagAux/IAA1 유전자가 single copy로 존재하는 것을 확인하였다. PagAux/IAA1 유전자는 잎과 꽃에서 특이적으로 발현되었다. 그리고 PagAux/IAA1 유전자는 현탁배양세포의 생장 과정에서 초기 지수생장기에 발현되었다. PagAux/IAA1 유전자의 발현을 분석한 결과, 건조와 염 스트레스 및 식물호르몬인 ABA 처리에 의해 발현이 감소된 반면 저온 스트레스, 형성층의 세포 분열 과정 그리고 식물호르몬인 GA와 JA 처리에서 발현이 증가하였다. 따라서 PagAux/IAA1 유전자가 현사시나무에서 저온 스트레스 반응뿐 아니라 생장 과정에 관여할 것으로 판단된다.

Keywords

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