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Distribution of elements on tobacco trichomes and leaves under cadmium and sodium stresses

한국식물학회지 2004년 47권 2호 p.75 ~ 82
최용의, Harada Emiko, Kim Gwang-Hoon, Yoon Eui-Soo, Sano Hiroshi,
소속 상세정보
최용의 ( Choi Yong-Eui ) - Kangwon National University College of Forest Sciences Division of Forest Resources
 ( Harada Emiko ) - Kangwon National University College of Forest Sciences Division of Forest Resources
 ( Kim Gwang-Hoon ) - Kongju National University Department of Biology
 ( Yoon Eui-Soo ) - Kongju National University Department of Biology
 ( Sano Hiroshi ) - Nara Institute of Science and Technology Research and Education Center for Genetic Information

Abstract


When tobacco (Nicotiana tabacum) plants are exposed to toxic level of cadmium (0.2 mM Cd), their trichomes actively excrete crystals (Choi et al., 2001). In this study, we investigated the distribution of Cd and NaCI on trichomes and leaf surfaces. Energy dispersive x-ray (EDX) analysis revealed that, under toxic Cd stress, crystals exudated from the trichomes contained high amounts of Ca, Mg, and Cd, as well as low levels of P, S, and Mn. Electron spectroscopic imaging (ESI) from trichomes and attached crystals showed that these crystals emitted denser radiation energy for Ca and Cd than did the head cells of the trichomes. However, no Cd was detected on the trichome surface itself or within the leaf epidermis. In contrast, treatment with salt (NaCI) did not stimulate crystal formation; instead, it induced the abnormal expansion of trichome cells. Although Na was not accumulated within the crystals, a considerable amount of both Na and CI was sequestered within the stalk cells of the long trichomes. Therefore, we believe that tobacco trichomes play an important role in Cd crystal exudation through crystallization, but that, under NaCI stress, the long trichomes sequester those elements within their stalks.

키워드

crystal; heavy metal; salt; trichome

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