Prolonged Survival of CAM-Mode Mesembryanthemum crystallinum in Darkness and its Possible Dependence on Malate

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概要

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• A remarkable difference was found in the survival of leaves of Mesembryanthemum crystallinum with plants grown in the C_3 versus the CAM mode. With excised leaves (petiole in solution) of C_3-mode plants subjected to 6 days of darkness, there was a large reduction in the chlorophyll content of the leaf and leaf turgor had decreased. By day 9, the chlorophyll had disappeared, except at the major veins, and the leaf tip had dried and turned brown. In contrast, the leaf tissue in the CAM mode showed only a partial loss of chlorophyll during the same period, and even after 17 days of darkness, the tissue at the base was still alive. Similarly, intact plants grown in the C_3 mode deteriorated much faster during 20 days of darkness than did plants grown in the CAM mode. Chlorophyll content, chlorophyll a/b ratio, phosphoenolpyruvate carboxylase, NADP-malic enzyme, malate and starch content were measured. In both C_3- and CAM-mode plants, the starch content decreased rapidly during the dark period and was nearly depleted after two days. In the CAM-mode tissue, there was a relatively high level of malate during prolonged darkness (up to 17 days), with a transitory rise early in the dark period. In contrast, the malate content was low and rapidly depleted in the C_3-mode leaves kept in darkness. These findings suggest that malate may be an important source of carbon for sustaining leaves of CAM-mode M. crystallinum during prolonged darkness.

• 日本植物生理学会の論文

著者

• Sanada Yukika

  Department Of Biology Faculty Of Science Kanazawa University

• Sanada Y.

  Department Of Biology Faculty Of Science Kanazawa University

• Sanada Y.

  Botanical Institute, Faculty of Sciences, Kanazawa University

• Nishida K.

  Botanical Institute, Faculty of Sciences, Kanazawa University

• Edwards G.

  Botany Department. Washington State University

• Nishida K

  Botanical Institute Faculty Of Sciences Kanazawa University

• Nishida K.

  Botanical Institute, Faculty of Science, Kanazawa University

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