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題名 | Study on Laminar Hydathodes of Ficus Formosana (Moraceae) III. Salt Injury of Guttation on Hydathodes=細葉天仙果葉部泌水器的研究:III.泌溢作用對泌水器的鹽傷害 |
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作者 | 陳淇釧; 陳榮銳; | 書刊名 | Botanical Studies |
卷期 | 48:2 2007.04[民96.04] |
頁次 | 頁215-226 |
分類號 | 373.1 |
關鍵詞 | 泌水組織; 天仙果; 液相吞食; 泌水器; 鞘層; 鹽害; 水孔; Epithem; Ficus formosana maxim; Fluid-phase endocytosis; Hydathodes; Sheath layer; Salt injury; Water pore; |
語文 | 英文(English) |
中文摘要 | 由於泌縊溶液內含有機及無機鹽類,加上白天蒸散作用的濃縮效果,提高了泌水器內鹽類的濃度,高鹽逆境對泌水器造成組織的傷害。本研究以電子顯微鏡觀察高鹽逆境對細葉天仙果葉部泌水器所引起的傷害。從超微構造主要的鹽害病徵是許多濃電子密度粒子分佈於細胞核與各種胞器內,造成細胞核仁濃縮、消失;細胞質內部胞器與內膜系崩解變成親過氧化的物質存在;隨著急速脫水作用使崩解的膜系呈透明化而形成類囊膜鞘構造。由不同的鹽害程度發現,不同組織呈現不同鹽害耐性,末梢組織耐高鹽能力較其他組織高,顯示泌水器內末梢組織細胞似乎已演化出一些有效的調節機制,用來適應高鹽及高滲透壓的逆境;除了生理代謝的調節適應外,包括了迂迴的細胞壁,大量增殖的過氧化小體、發達的內膜系統與內噬作用等形態構造上的改變,藉由增加與環境接觸面積來提高液胞功能的有效性以增加細胞對高鹽逆境的耐受性。 |
英文摘要 | The salt concentrations of gutted solution of laminar hydathodes on leaf usually increase after the repetition of guttation and eva-transpiration, and thus situation may lead to injure the hydathodes. The aim of this study is to investigate the salt injury of gutted solution on hydathodes of Ficus formosana Maxim. by using electron microscopy. Ultrastructural studies show that the hypertonic stress of gutted solution caused by evaporation could lead the injury of hydathodes. The major symptoms of salt injury caused by hypertonic stress are as the follows: many electron dense particles are spread in the nucleus and other organelles; the nucleolus is condensed and then disappeared; the endomembrane system is collapsed and then entirely become osmiophilic materials in the cytoplasm. Upon dehydration, the collapsed membranes become myelin-like structures are also observed. According to different degrees of salt injury within hydathodes, the abilities of tissue's salt-tolerance are diversified and tolerance ability of the epithem is better than other tissues. These results imply that epithem possesses some special mechanisms that have been evolved to adapt the damage stress. In addition to physiological regulation, we suggest that some morphological changes such as the sinuous cell wall, proliferation of peroxisomes and the abundant endomembrane systems, and the conspicuous fluid-phase endocytosis. Epithem promotes the tolerant efficiency of vacuoles by increasing the contact surface with environment to accelerate salt tolerance. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。