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학술저널
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한국원예학회 HORTICULTURE ENVIRONMENT and BIOTECHNOLOGY JOURNAL OF THE KOREAN SOCIETY FOR HORTICULTURAL SCIENCE Vol.45 No.2
발행연도
2004.4
수록면
83 - 87 (5page)

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CO₂ assimilation and photo system Ⅱ (PSII) activities under various photosynthetic photon flux density (PPFD) conditions were compared in one-year-old cuttings of Vitis vinifera × V. labrusca cv. 'Campbell Early' and 'Kyoho'. Maximum CO₂ assimilation rates in 'Campbell Early' and 'Kyoho' were 13.1 and 11.0 μ㏖ㆍm?²ㆍs?¹, respectively. Net CO₂ assimilation rate was higher in 'Campbell Early' than in 'Kyoho' by 1-3 μ㏖ㆍm?²ㆍs?¹ depending on PPFD ranged from 500 to 2,000 μ㏖ㆍm?²ㆍs?¹. However, apparent quantum yield, light compensation point, and dark respiration rate were not significantly different in the two cultivars. Quantum yields of PSII in both cultivars decreased linearly with increasing PPFD, except abrupt increase at 70 μ㏖ㆍm?²ㆍs?¹ PPFD. Electron transport rate (ETR) was higher in 'Campbell Early' than in 'Kyoho' beyond 500 μ㏖ㆍm?²ㆍs?¹ PPFD. Under PPFD conditions beyond light compensation point, net CO₂ assimilation rate was curvilinearly related to stomatal conductance, indicating that CO₂ assimilation was affected by both stomatal and non-stomatal factors. Curvilinear relationship was also found between the responses of net CO₂ assimilation rate and ETR to incident PPFD. Our results demonstrated that both cultivars had similar photosynthetic characteristics at low PPFD. At high PPFD, however, 'Campbell Early' exhibited higher CO₂ assimilation rate.

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Abstract
Introduction
Materials and Methods
Results
Discussion
Acknowledgements
Literature Cited

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