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頁籤選單縮合
題名 | 大豆滲透調節與耐旱性之關係 |
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作者 | 廖松淵; 陳清義; | 書刊名 | 中華農學會報 |
卷期 | 158 1992.06[民81.06] |
頁次 | 頁19-28 |
分類號 | 434.213 |
關鍵詞 | 大豆; 耐旱性; 滲透; 調節; |
語文 | 中文(Chinese) |
中文摘要 | 為了解長期乾旱處理對溶質累積、滲透調節及耐旱性間關係,以PVF自動供水裝置,進行不同程度缺水處理,測定各大豆品種之淨光合成率、葉光水分潛勢、滲透潛勢、膨壓與葉片可溶性蛋白質、可溶性糖及脯胺酸含量。供試品種包括Dah liarn、Native 13、AGS 62、Sanluis及66-F-4-2等五品種。 土壤水分潛勢下降時,各品種之葉片水分潛勢及滲透潛勢下降趨勢迥異。其中AGS 62具滲透調節機能,為耐旱品種,Native 13為最不耐旱品種。 葉片缺水時,可溶性蛋白質含量下降,因此,可溶性蛋白質可能未直接涉及滲透壓調節。脯胺酸含量則因缺水而增加,但最高含量僅為2 µmole/dm²,此濃度在滲透壓調節上,對液胞滲透潛勢之影響不大。 供試品種之葉片可溶性糖含量,均隨葉片水分潛勢之減低而增加,唯品種間可溶性糖累積程度與品種耐旱程度有關。因此,可溶性糖含量之變化,在溶質累積與滲透調節中,扮演著重要角色。 |
英文摘要 | Intact soybean plants were subjected to long-term drought stress mimicked field condition. Water was supplied by PVF strips. Tested soybean varierties were grown under non-stress, moderate stress and severe stress, respectively. Photosynthetic rate, leaf water potential, osmotic potential, turgor pressure, soluble protein content, soluble sugar and proline contents of five soybean varieties, including Dah liarn, Native 13, AGS 62, Sanluis and 66-F-4-2, were measured simultaneously. The responses of solute accumulation to drought stress as well as the relationship between osmotic adjustment and drought resistance in tested soybean varieties were studied. Decendant trends of leaf water potential and leaf osmotic potential with soil water potential differed with varieties. AGS 62 could adjust osmotic potential under water deficit and was drought resistant, while Native 13 was not resistant. Leaf soluble protein contents decreased under water deficit. It implied that soluble protein didn't contribute to osmotic adjustment. Leaf proline contents under long-term drought stress increased to a peak of about 2 µmole/dm². Quantitatively, such an increase seems not significantly contributing to the osmotic adjustment of soybean at dry habitats. Under water stress conditions, soluble sugar contents obviously declined with leaf water potential. Based on this study, it is concluded that soluble sugar played an important role in solutes accumulation and osmotic adjustment of soybean under drought condition. |
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