摘要 | 对 0(对照)和 20 g· L-1 NaCl 胁迫条件下杂交狗牙根(Cynodon dactylon × C. transvaalensis)品种‘苏植 2 号’(‘Suzhi No. 2’)和‘Tifgreen’不同部位的生长状况以及 Na+ 和 K+ 积累的差异进行了研究,并分析了 2 个品种间Na+、K+转运调控机制的差异。 结果显示:在 NaCl 胁迫条件下,2 个品种的叶片相对枯黄率、地下茎和根系的相对干质量、叶片和根系的 Na+含量和 Na+ / K+比以及钠钾选择性转运系数增加;修剪茎叶及冠层和地上部的相对干质量、植株相对总干质量以及叶片和根系的 K+含量均降低,但茎叶含水量无显著变化。 NaCl 胁迫条件下,不同土层中 2 个品种的根系相对干质量均不同程度增加,且 20 ~ 40 和 40 ~ 60 cm 土层中根系干质量的增幅大于 0 ~ 20 cm土层;在 0 ~ 20 cm 土层中 2 个品种根系的分配比例均有所降低,而在 20 ~ 40 和 40 ~ 60 cm 土层中则不同程度提高。 与‘Tifgreen’相比,NaCl 胁迫条件下‘苏植 2 号’叶片相对枯黄率、Na+含量和 Na+ / K+比更低,修剪茎叶及冠层和地上部的相对干质量、植株相对总干质量、叶片 K+含量和钠钾选择性转运系数更高;在 20 ~ 40 和 40 ~ 60 cm 土层中‘苏植 2 号’根系相对干质量显著高于‘ Tifgreen’,根系分配比例总体也高于‘ Tifgreen’。 综合比较结果表明:‘苏植 2 号’的抗盐性强于‘Tifgreen’,可能与其深层根系分配量更高和钠钾选择性转运能力较强有关。 |
Abstract |
Growth status and Na+ and K+ accumulation of different parts of cultivar ‘ Suzhi No. 2’ and ‘Tifgreen’ of hybrid bermudagrass ( Cynodon dactylon × C. transvaalensis ) under conditions of 0(control) and 20 g · L-1 NaCl ( stress treatment) were researched, and differences of Na+ and K+ regulation mechanism between two cultivars were analyzed. The results show that under NaCl stress condition, relative percentage of leaf firing, relative dry weights of rhizome and root, Na+ content and Na+ / K+ ratio in leaf and root and selective transportation coefficient of Na+ and K+ of two cultivars increase, relative dry weights of shoot clipping, crown and above-ground part, relative total dry weight of plant and K+ content in leaf and root decrease, while there is no significant change in water content of shoot. Under NaCl stress condition, relative dry weight of root of two cultivars in different soil layers increases with different degrees, the increase range of root dry weight in soil layers of 20-40 and 40-60 cm is bigger than that in soil layer of 0-20 cm. Root distribution percentage of two cultivars in soil layers of 0-20 cm slightly decreases, while that in soil layers of 20-40 and 40-60 cm increases with different degrees. Compared with ‘Tifgreen’, relative percentage of leaf firing, Na+ content and Na+ / K+ ratio in leaf of ‘Suzhi No. 2’ are lower, and relative dry weights of shoot clipping, crown and above-ground part, relative total dry weight of plant, K+ content in leaf and selective transportation coefficient of Na+and K+ of ‘Suzhi No. 2’ are higher under NaCl stress condition. In soil layers of 20-40 and 40-60 cm, relative dry weight of root of ‘Suzhi No. 2’ is significantly higher and its root distribution percentage is generally higher than those of ‘ Tifgreen’. The comprehensive comparison result shows that salinity-tolerance of ‘Suzhi No. 2’ is higher than that of ‘ Tifgreen’, which might be associated with higher distribution amount of deep root and stronger selective transportation capacity of Na+ and K+. |
关键词 | 杂交狗牙根; 盐胁迫; 生长; 根系分布; 离子调控; 品种‘苏植 2 号’ |
Key words | hybrid bermudagrass (Cynodon dactylon × C. transvaalensis); salinity stress; growth; root distribution; ion regulation; cultivar ‘Suzhi No. 2’ |
作者 | 陈静波1,2, 牛佳伟1,2, 田海燕3, 宗俊勤1, 高艳芝1,2, 刘建秀1 |
所在单位 | 1.江苏省• 中国科学院植物研究所(南京中山植物园) 江苏省盐土生物资源研究重点实验室, 江苏 南京 210014;2. 南京农业大学园艺学院, 江苏 南京 210095; 3. 江苏大丰盐土大地农业科技有限公司, 江苏 大丰 224145 |
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基金项目 | 国家自然科学基金资助项目(31101567); 国家“十二五”科技支撑计划项目(2011BAD13B09; 2012BAB03B04); 江苏省盐土生物资源研究重点实验室开发基金项目(JKLBS2013001) |