Biologia plantarum 53:133-137, 2009 | DOI: 10.1007/s10535-009-0019-x
Stomatal and non-stomatal limitations to photosynthesis in field-grown grapevine cultivars
- 1 Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, Korea
- 2 Department of Plant Science, Seoul National University, Seoul, Korea
Diurnal changes of photosynthesis in the leaves of grapevine (Vitis vinifera × V. labrusca) cultivars Campbell Early and Kyoho grown in the field were compared with respect to gas exchanges and actual quantum yield of photosystem 2 (ΦPS2) in late May. Net photosynthetic rate (PN) of the two cultivars rapidly increased in the morning, saturated at photosynthetic photon flux density (PPFD) from 1200 to 1500 µmol m-2 s-1 between 10:00 and 12:00 and slowly decreased after midday. Maximum PN was 13.7 and 12.5 µmol m-2 s-1 in Campbell Early and Kyoho, respectively. The stomatal conductance (gs) and transpiration rate changed in parallel with PN, indicating that PN was greatly affected by gs. However, the decrease in PN after midday under saturating PPFD was also associated with the observed depression of ΦPS2 at high PPFD. The substantial increase in the leaf to air vapour pressure deficit after midday might also contribute to decline of gs and PN.
Keywords: gas exchange; quantum yield; stomatal conductance; transpiration rate; vapour pressure deficit
Subjects: air humidity; leaf temperature; leaf to air vapour pressure deficit; net photosynthetic rate; photon flux density; quantum yield; stomatal conductance; stomatal limitation; transpiration rate; water use efficiency (WUE)
Received: February 16, 2007; Accepted: August 8, 2007; Published: March 1, 2009 Show citation
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