Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Characterization of Photosynthetic Rates by Tomato Leaf Position

토마토 엽위별 광합성 특성 분석

  • Kim, Sung Eun (Department of Plant and Food Sciences, Sangmyung University) ;
  • Lee, Moon Young (Department of Plant and Food Sciences, Sangmyung University) ;
  • Kim, Young Shik (Department of Plant and Food Sciences, Sangmyung University)
  • 김성은 (상명대학교 식물식품공학과) ;
  • 이문영 (상명대학교 식물식품공학과) ;
  • 김영식 (상명대학교 식물식품공학과)
  • Received : 2012.07.12
  • Accepted : 2012.12.18
  • Published : 2013.04.30
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Abstract

The photosynthetic rates according to leaf positions in tomato plants were investigated in relation to leaf age and flowering rate. In the experiment investigating the diurnal change of photosynthetic rates, three leaves below the 4th cluster was checked every hour from 2 hours before sunrise and 3 hours after sunset. It was checked twice with the replication of 3 plants. The photosynthetic rate increased sharply for 1 hour right after sunrise and remained steady until 2 hours before sunset. This trend can be applied to determine the irrigation schedule. In the experiment investigating the photosynthetic rates according to leaf positions, it three leaves below each clusters from 1st to 4th cluster were checked. Flowering rate was also investigated. The photosynthetic rates showed a decreasing tendency steadily after flowers bloomed fully, regardless of the leaf position. It seems to be because the leaves below the cluster with fully-bloom flowers lost their activities. This result suggests the flowering rate or the position of flower has deep relation with the photosynthetic rates of the concerned leaves. From the results the leaves under flowering cluster may be the good part to investigate the photosynthetic rate to evaluate the crop's activity, even the photosynthetic rates are different according to the position of clusters.

토마토 잎들의 엽위별 광합성 특성을 조사하고, 잎의 연령과 개화속도를 엽위별 광합성 특성과 비교분석하였다. 일중 광합성 속도 특성실험에서는 일출 전 2시간부터 일몰 후 3시간까지 1시간마다 4번째 화방의 하부엽 3매의 광합성 속도를 측정하였다. 3개체를 반복으로 총 2회 조사하였다. 토마토의 일중 광합성 속도는 일출 후 1시간 동안 급격히 증가한 후, 일몰 2시간 전까지 일정하게 유지되는 양상을 보여 급액의 시작과 마감시각을 결정하는데 적용할 수 있을 것으로 사료된다. 엽위별 광합성 속도 특성실험에서는 1화방부터 4화방까지 각 화방의 하부에 있는 본엽 3개씩을 대상으로 광합성 속도를 조사하였다. 또한 광합성 특성을 분석하는데 적용하기 위해 개화속도를 조사하였다. 광합성속도는 엽위에 관계없이 꽃이 만개하는 시기를 정점으로 지속적으로 감소하는 경향을 보였다. 이는 만개 이후에는 해당 화방 이하의 잎의 활력이 감소하고 생육단계가 노화단계로 이동하기 때문으로 사료된다. 따라서 토마토의 개화속도와 광합성 속도는 서로 밀접한 관련이 있는 것으로 나타났다. 연구결과, 생육단계(엽령)의 차이에 의해 각 화방별 광합성 속도는 차이가 있으나, 광합성 속도로 작물의 활력을 판단하려 할 때는 개화하고 있는 화방의 하부엽을 조사하는 것이 매우 효과적일 것으로 판단된다.

Keywords

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