Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Effect of NaCl Stress on the Growth, Antioxidant Materials, and Inorganic Ion Content in Head Lettuce Seedlings

양상추 유묘의 생육, 항산화물질 및 무기이온의 함량에 미치는 NaCl 스트레스의 영향

  • Kim, Ju-Sung (Majors in Plant Resource Sciences and Environment, Jeju National University) ;
  • Hyun, Tae-Kyung (Division of Applied Life Science, Gyeongsang National University)
  • 김주성 (제주대학교 식물자원환경전공) ;
  • 현태경 (경상대학교 응용생명과학부)
  • Received : 2011.04.04
  • Accepted : 2011.09.04
  • Published : 2011.10.31
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Abstract

In head lettuce seedlings, NaCl stress was treated with hydroponic culture containing 0, 50, or with 100 mM NaCl in the seedling grown up to two leaf stages. Our focus was on the effect of NaCl on fresh and dry weights, antioxidant materials, and inorganic ion level. Fresh and dry weights of head lettuce seedlings increased with the increase in salinity while the optimal growth occured at 50 mM NaCl. The chlorophyll a (Chl a), total Chl and Chl a/b ratio increased 6 days after treatment with 100 mM NaCI. However, the Chl b content decreased. Total glutathione increased only in the root of head lettuce seedlings, whereas significant increase of total arcorbate content was observed in both shoot and root after the treatment with 100 mM NaCl. In addition, the NaCl treatment resulted in the decreased level of spermidine content, and a increased spermine content. Furthermore, $Na^+$ content in shoot and root increased significantly while $K^+$, $Ca^{2+}$, and $Mg^{2+}$ content decreased. The alteration of inorganic ion level after treatment with NaCl caused the reduction of $K^+/Na^+$, $Ca^{2+}/Na^+$, and $Mg^{2+}/Na^+$ ratio with the increase of NaCl concentration. Taken together, these findings indicate that the treatment of NaCl causes the induction of oxidative stress, and results in the alteration of metabolic mechanism in head lettuce seedlings.

본 실험은 수경재배 방식으로 본엽 2매까지 키운 양상추를 이용하여 NaCl 스트레스(0, 50 및 100mM NaCl)에 의한 생체중과 건물중, 항산화 물질 및 무기이온 함량 의 변화를 조사하였다. 양상추 유묘의 생체중 및 건물중은 NaCl의 농도 증가에 따라 증가하였으며, 50mM NaCl 처리시 가장 높았다. Chl a, total Chl 함량과 Chl a/b는 100mM NaCI 처리 후 6일째 증가하였으나, Chl b 함량은 감소하였다. 100mM NaCl 처리 후, 총글루타치온 함량은 양상추 유묘의 뿌리에서 증가하였으나, 총아스코르빈산은 뿌리와 줄기에서 모두 증가하였다. 또한, NaCl 스트레스에 의한 spermidine 감소 현상과 spermine 증가현상을 나타내었다. 게다가, 뿌리 및 줄기에서 $Na^+$ 함량이 증가함에 따라 $K^+$, $Ca^{2+}$ 및 $Mg^{2+}$ 함량은 감소하였으며 $K^+/Na^+$, $Ca^{2+}/Na^+$ 및 $Mg^{2+}/Na^+$ ratio 역시 감소하였다. 종합해보면, 이들 결과는 양상추 유묘에서 NaCl 처리에 의해 산화 스트레스가 유도되고, 그 결과 산화 스트레스에 대응하기 위한 대사과정의 변화로 판단된다.

Keywords

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