2021년 9월부터 2022년 1월까지 여름, 가을, 겨울의 계절적 특성을 갖는 온실 환경 변화에 따른 토마토 엽위별 광생리학적 특성을 규명하고자 하였다. 토마토 엽위는 위치에 따라 상, 중, 하위엽으로 구분하였다. 9월, 11월, 1월에 광합성률, 기공전도도, 증산율은 상, 중, 하위엽의 순으로 감소하였다. 특히 1월의 하위엽은 기공전도도, 증산율이 큰 폭으로 감소하여 광합성 효율에 영향을 미쳤다. 9월과 11월에 측정된 상위엽의 F<sub>V</sub>/F<sub>M</sub> 값은 각각 0.71과 0.80으로 중위엽과 하위엽보다 유의하게 낮았다. 그러나 ABS/RC 및 TR<sub>O</sub>/RC 값은 중위엽과 하위엽에 비해 상위엽에서 유의하게 높았다. 9월에 측정된 OJIP 곡선의 I-P 수준에서는 상위엽이 중위엽보다 낮은 값을 보였다. 엽록소 a 함량은 계절에 따라 변화를 나타내지 않았지만, 엽록소 b, 엽록소 a+b 함량은 겨울에 더 감소한 반면, 카로티노이드 함량은 증가하였다. 각 매개변수의 상관관계 분석에서 광합성률은 증산율, 기공전도도와 양의 상관관계를 보였고, 광합성 매개변수 PCA 분석에서 PC1의 주요한 변동 요인 중 하나로, F<sub>V</sub>/F<sub>M</sub> 값은 양의 상관관계를 나타내며, 광합성률, 증산율, 기공전도도는 음의 상관관계를 보였다.
This study aimed to identify the characteristics of the photophysiological responses at the leaf level of tomatoes depending on changes in the greenhouse environment during the seasonal transition from September of 2021 to January of 2022, encompassing the summer, autumn and winter seasons. Tomato leaves were classified as upper, middle, and lower sections based on the locations of the stem nodes. Subsequently, the photosynthetic characteristics, chlorophyll fluorescence parameters, and chlorophyll components were investigated within the classified leaf sections. Correlations between each parameter were determined and a principal component analysis (PCA) was conducted. The photosynthetic rate, stomatal conductance, and transpiration rate of tomatoes measured in September, November, and January decreased in the order of the upper, middle, and lower leaves. In particular, the stomatal conductance and transpiration rate of the lower leaves decreased significantly in January, which affected the photosynthetic efficiency. The F<sub>V</sub>/F<sub>M</sub> values of the upper section measured in September and November were 0.71 and 0.80, respectively, which were lower than those of the middle and lower sections. However, the ABS/RC and TR<sub>O</sub>/RC values were significantly higher in the upper section compared to the middle and lower sections. Conversely, at the I-P level of the OJIP curve measured in September, the upper section exhibited lower values than the middle section. The chlorophyll a content did not show any variation in value across leaf positions with the changing seasons. However, the contents of chlorophyll b and chlorophyll a+b were reduced in winter, whereas the carotenoid content increased. In the correlation analysis of each parameter, the photosynthetic rate showed a strong positive correlation with the transpiration rate and stomatal conductance. In the PCA analysis of the photosynthetic parameters, the F<sub>V</sub>/F<sub>M</sub> value was one of the main contributing factors to PC1, showing a positive correlation, while the photosynthetic rate, transpiration rate, and stomatal conductance exhibited negative correlations.