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題名 | The Physiological Responses of Zoysia Clones to NaCl Stress=結縷草在鹽逆境下之生理反應 |
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作者姓名(中文) | 翁仁憲; 陳奕君; | 書刊名 | 作物、環境與生物資訊 |
卷期 | 4:3 2007.09[民96.09] |
頁次 | 頁259-268 |
分類號 | 377.2124 |
關鍵詞 | 基因型; 鹽逆境; 耐鹽性; 結縷草; Genotype; NaCl stress; Salinity tolerance; Zoysia; |
語文 | 英文(English) |
中文摘要 | 結縷草(Zoysia spp.)為多年生C4型草坪草種,廣佈於臺灣海岸,不同營養系之間其耐鹽性差異甚大。本研究選取耐鹽性高(LRM及LCG,在7.5% NaCl濃度下培養三週尚能維持一些綠葉)及低(HB及KE,在3% NaCl濃度下培養三週後,葉片全枯及近於全枯)者各二營養系為材料,將之培養於含有NaCl之營養液中,濃度從0.5%漸增至3%,探討其在鹽逆境下之生理反應。結果顯示,雖然在鹽逆境下各營養系體內Na+累積量均會增加,但是對鹽最敏感的營養系-HB,由於其根部之拒鹽 (exclusion) 及葉片鹽腺之排鹽 (secretion) 能力均較差,故其莖葉所累積之Na+較其他三營養系為多。此外,在莖葉Na+累積量相同之情況下比較時,較耐鹽之LRM及LCG兩營養系其膜系較不易受Na+侵害,可維持較正常之選擇通透性。再者,在鹽逆境下各營養系體內脯胺酸累積量亦會增加,惟HB及KE兩個較不耐鹽之營養系其莖葉所累積之脯胺酸較耐鹽者高。但是,鹽逆境對各營養系體內K+累積均無顯著之影響。 |
英文摘要 | Zoysia spp., a perennial C4 grass species with well-developed stolon and short culm, can form a dense lawn. Some varieties of this species are important turfgrass and show a great variation in salinity tolerance. NaCl-tolerant clones of Z. sinica and Z. matrella (LRM and LCG, could retain a few green leaves at 7.5% NaCl for 3 weeks) and two sensitive clones of Z. matrella (HB and KE, showed 100% and near 100% leaf necroses in 3% NaCl) were used for this study. Plants were grown in nutrient solution supplemented with NaCl up to 3% under controlled conditions. The most sensitive clone (HB) showed higher Na(superscript +) accumulation than the other sensitive clone (KE) and two tolerant clones, due to both lower rates of Na(superscript +) secretion from leaves and Na(superscript +) exclusion in shoots. Moreover, compared with the same level of Na+ accumulated in shoot, two NaCl-sensitive clones showed higher degree of leaf electrolyte leakage than those of two tolerant clones. Thus, Zoysia clones with NaCl-tolerant ability could not only restrict saline ion accumulation in shoots but also maintain membrane integrity under NaCl treatment. Besides, higher concentrations of proline were accumulated in the shoot of two NaCl-sensitive clones, but K(superscript +) contents in both shoot and rhizome + root were not significantly influenced by NaCl treatment for both NaClsensitive and tolerant clones. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。