Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Effects of CaCl2 on Gas Exchange and Stomatal Responses in the Leaves of Prunus serrulata

염화칼슘이 벚나무 잎의 가스교환 및 기공반응에 미치는 영향

  • Je, Sun Mi (Forest Ecology Division, National Institute of Forest Science) ;
  • Kim, Sun Hee (Forest Ecology Division, National Institute of Forest Science)
  • 제선미 (국립산림과학원 산림생태연구과) ;
  • 김선희 (국립산림과학원 산림생태연구과)
  • Received : 2016.03.17
  • Accepted : 2016.07.19
  • Published : 2016.09.30
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Abstract

To investigate the effect of calcium chloride ($CaCl_2$) using for deicing salts in winter on gas exchange and stomatal responses of 3-year-old Prunus serrulata, we treated twice (1 L) $CaCl_2$ solution (0.5%, 1.0% and 3.0%) in the root zone before leaf unfolding. Stomatal conductance ($g_s$), photosynthetic rate ($P_n$), transpiration rate ($T_r$) and water use efficiency (WUE) in the leaves of P. serrulata were decreased with increasing of $CaCl_2$ concentration. Even though stomatal conductance and photosynthetic rate were reduced by $CaCl_2$, intercellular $CO_2$ concentration ($C_i$) in $CaCl_2$ treatments has similar or higher values compared with control. These results suggest that non-stomatal limitation as well as stomatal limitation induced the reduction of photosynthetic rate together. On the other hands, treatment of $CaCl_2$ before leaf unfolding also affected leaf morphology traits. We proposed that reductions of stomatal length and leaf size and high pore density with increasing salinity is adaptative mechanism to reduce the water loss in plant.

겨울철 제설제로 사용하는 염화칼슘에 의한 3년생 벚나무 잎의 가스교환 및 기공반응에 대해 알아보기 위해 개엽 전 염화칼슘 0.5%, 1.0%, 3.0% 수용액을 2회(1 L) 근권부에 처리하였다. 염화칼슘 처리 농도가 증가함에 따라 벚나무의 기공전도도($g_s$), 광합성율($P_n$), 증산율($T_r$), 그리고 수분이용효율(WUE)은 감소하였다. 염화칼슘 처리에 의해 기공전도도와 광합성율이 감소하였음에도 불구하고 엽육세포 내 $CO_2$ 농도($C_i$)가 대조구와 비슷하거나 높게 나타났다. 이러한 결과는 기공제한 뿐만 아니라 비기공제한 요인도 함께 광합성율의 감소를 야기하였다는 것을 의미한다. 한편, 벚나무의 개엽 전 염화칼슘 처리는 잎의 형태적 특징에도 영향을 주었다. 염분농도가 증가할수록 기공의 길이가 작아지고 기공밀도가 높게 나타났으며 잎의 크기가 작아졌는데, 이는 식물체 내 수분손실을 줄이기 위한 적응기작으로 판단된다.

Keywords

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