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논문 기본 정보

자료유형
학술저널
저자정보
Cho, Young-Yeol (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University) Son, Jung-Eek (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Seoul National University)
저널정보
한국식물학회 식물학회지 식물학회지 제50권 제1호
발행연도
2007.1
수록면
8 - 11 (4page)

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Temperature is a principal environmental factor that directly affects the growth and timing of appearance for crop leaves. To estimate the leaf number and leaf area of 'Seoul' pak-choi plants (Brassica campestris ssp. chinensis), we applied the concept of growing degree-days $\{GDD=(T_{avg-T_{base}){\times}days\},\;where\;T_{avg},\;T_{base}$, and days were the daily average air temperature, base temperature, and days after transplanting, respectively. Leaves that were beginning to unfold with a leaf area ${\geq}1cm^{2}$ were counted every 2 to 3 d. Linear relationships were found between leaf number and days after transplanting as well as between leaf number and GDD. The rate of appearance and the number of leaves per GDD were 0.542 leaves $d^{-1}$ and 0.051 leaves $^{\circ}C^{-1}d^{-1}$ respectively. In contrast, the relationship was non-linear between leaf number and leaf area, with the latter being calculated as $[(128.9+11.6{\times}GDD-0.03{\times}GDD^{2})/\{1+(0.051{\times}GDD+3.5)/13.7)^{(-3.9)\}]\;(cm^{2}^{\circ}C^{-1}d^{-1})$. Using model validation, we found that the estimated leaf number and leaf area showed strong agreement with measured values. Our results demonstrate the usefulness of modeling to estimate total leaf area and growth from hydroponically grown pak-choi plants.

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