Non-Stomatal Inhibition Associated with Inactivation of Rubisco in Dehydrated Coffee Leaves under Unshaded and Shaded Conditions

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概要

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• The effect of rapid dehydration due to withholding of irrigation on leaf photosynthesis in coffee (Coffea arabica L.) was studied by comparing the CO_2-dependent rate of photosynthesis in intact leaves (A/Ci curve), the amounts of Chl, total soluble protein and ribulose-1,5-bisphosphate carboxylase (Rubisco) in leaves, and the activities of photo-chemical reactions of isolated chloroplasts and of Rubisco under unshaded and shaded conditions. The CO_2-saturated rate of photosynthesis and the carboxylation efficiency (the initial slope of A/Ci curve) decreased with decreasing leaf water potential (Ψ_w). The non-stomatal limitation of photo-synthesis, whereby photosynthesis was depressed independent of a restricted supply of CO_2 to the leaf as a result of stomatal closure, was estimated from changes in A/Ci curves and accounted for about 65% and 60% of the total reduction in the rate of photosynthesis at a Ψ_w of -1.8 MPa in the unshaded and shaded leaves, respectively. When leaf dehydration became more severe (-3.0 MPa), the non-stomatal limitation of photosynthesis increased to more than 90% in both unshaded and shaded leaves. Levels of total leaf soluble protein, Rubisco and Chl and the activity of whole-chain electron transport were unaffected by dehydration, but the initial activity of Rubisco decreased significantly. The non-stomatal contribution to the decrease in photosynthesis in coffee leaves that had been exposed to rapid dehydration was associated with inhibition of the activity of Rubisco in vivo.

• 日本植物生理学会の論文

著者

• Kanechi Michio

  Plant Resource Science, Graduate School of Agricultural Science, Kobe University

• Uchida Naotsugu

  神戸大学自然科学研究科

• KANECHI Michio

  Faculty of Agriculture, Kobe University

• Yamaguchi Tadashi

  Faculty Of Agriculture Kobe University

• Kanechi Michio

  Plant Resource Science Graduate School Of Agricultural Science Kobe University

• Kanechi Michio

  Faculty Of Agriculture Kobe University

• Yasuda T

  Grad.sch.sci.tech.

• Yamaguchi Tadashi

  Laboratory Of Plant Molecular Biology Division Of Applied Life Sciences Graduate School Of Agricultu

• Uchida Naotsugu

  Faculty of Agriculture, Kobe University

• Yasuda Takeshi

  Faculty of Agriculture, Kobe University

• Uchida Naotsugu

  Faculty Of Agriculture Kobe University

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