Turgor and the transport of CO2 and water across the cuticle (epidermis) of leaves

Journal of Experimental Botany
J S Boyer

Abstract

Leaf photosynthesis relies on CO₂ diffusing in while water vapour diffuses out. When stomata close, cuticle waxes on the epidermal tissues increasingly affect this diffusion. Also, changes in turgor can shrink or swell a leaf, varying the cuticle size. In this study, the properties of the cuticle were investigated while turgor varied in intact leaves of hypo stomatous grape (Vitis vinifera L.) or amphistomatous sunflower (Helianthus annuus L.). For grape, stomata on the abaxial surface were sealed and high CO₂ concentrations outside the leaf were used to maximize diffusion through the adaxial, stoma-free cuticle. For sunflower, stomata were closed in the dark or with abscisic acid to maximize the cuticle contribution to the path. In both species, the internal CO₂ concentration was measured directly and continuously while other variables were determined to establish the cuticle properties. The results indicated that stomatal closure diminished the diffusion of both gases in both species, but for CO₂ more than for water vapour. Decreasing the turgor diminished the movement of both gases through the cuticle of both species. Because this turgor effect was observed in the adaxial surface of grape, which had no stomata, it could only...Continue Reading

Citations

Jul 25, 2015·Plant & Cell Physiology·Jun Tominaga, Yoshinobu Kawamitsu
Jul 3, 2013·Journal of Environmental Radioactivity·S Le DizèsM Simon-Cornu
Mar 25, 2014·Journal of Plant Physiology·Sándor DulaiMárta Molnár-Láng
May 23, 2018·Journal of Experimental Botany·Xiaoxiao WangDongliang Xiong
Apr 26, 2018·Frontiers in Chemistry·Sheshshayee M SreemanRaju Soolanayakanahally
Mar 17, 2019·Plants·Mirwais M QaderiSage L Dixon
Sep 24, 2019·The New Phytologist·Yong LiMargaret M Barbour
Nov 5, 2019·The Plant Journal : for Cell and Molecular Biology·Dongliang Xiong, Miquel Nadal
Mar 11, 2020·Annual Review of Plant Biology·Tracy Lawson, Jack Matthews
Jul 17, 2020·Frontiers in Plant Science·David A GrantzJuergen Burkhardt
Aug 3, 2018·Environmental Science and Pollution Research International·Yanisa OlaranontPaweena Traiperm
Sep 7, 2018·Frontiers in Chemistry·Sheshshayee M SreemanRaju Soolanayakanahally
May 18, 2018·Scientific Reports·Lucas A CernusakGraham D Farquhar
Oct 30, 2021·The New Phytologist·Lucas A Cernusak, Martin G De Kauwe

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