| 水淹胁迫对消落带竹柳(Salix hybrid)幼苗的形态结构和生理生化特征的影响 |
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| 引用本文： | 甘丽萍,王晓念,曹煦悦,杨玲.水淹胁迫对消落带竹柳(Salix hybrid)幼苗的形态结构和生理生化特征的影响[J].水生态学杂志,2022,43(6):102-107. |
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| 作者姓名： | 甘丽萍 王晓念 曹煦悦 杨玲 |
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| 作者单位： | 重庆三峡学院生物与食品工程学院,重庆三峡学院,重庆三峡学院 |
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| 基金项目： | 重庆科委面上项目(cstc2019jcyj-msxm1218),重庆教委项目（KJQN202101244） |
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| 摘 要： | 探究水淹胁迫对竹柳的形态、生理指标及解剖结构的影响,为三峡库区消落带植被修复提供参考数据。选择长势一致的当年生竹柳扦插苗进行水淹处理,进行半淹组(SsG,水淹没植株根茎,在第一片叶以下)、全淹组( SG,水分淹没植株最顶端叶片)和对照组(CK,不水淹)处理,210天后,测定其生长指标、生理指标,并做根系切片观察解剖结构。结果表明,水淹后SsG组茎高显著高于另外2个组,茎上有很多凸起而肥大的皮孔,在茎基部形成了大量的气生根,根系数显著高于CK组,叶片呈狭长的线状,叶长宽比显著增加,SG组茎高、根系数均显著减少,叶片变小卷曲,增厚变脆微透明,颜色发红,由披针形变成椭圆形,叶长宽比显著降低;水淹后SsG组叶绿素含量与对照相比都呈上升趋势,SG组呈下降趋势,两种水淹处理叶绿素a/b的值都显著上升;水淹后SsG组叶和根中可溶性糖、叶中可溶性蛋白含量、根和叶中脯氨酸(Pro)含量与CK都无显著差异,只有根系中的可溶性蛋白显著低于CK,SG条件下可溶性蛋白和可溶性糖含量不管是叶还是根中都显著降低,而Pro含量显著上升;水淹后SsG组根系表皮层稍不完整,部分瓦解,皮层细胞间隙扩大,通气组织形成,SG组根系组织细胞受到明显损害,周皮及皮层细胞大部分解离,木质部细胞排列相对松散、细胞变大,髓射线不明显。说明SsG在一定程度上促进了植物地茎的生长,而SG具有显著的抑制作用,建议将竹柳配置在消落带高程的上半部分区域,能较好地能适应库区消落带的周期水淹。
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| 关 键 词： | 竹柳 水淹胁迫 三峡库区 生理生化 根系解剖 |
| 收稿时间： | 2021/9/16 0:00:00 |
| 修稿时间： | 2022/11/18 0:00:00 |
Effects of Flooding on the Morphology and Physiology of Salix Hybrid |
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| GAN Li-ping,WANG Xiao-nian,CAO Xu-yue,YANG Ling.Effects of Flooding on the Morphology and Physiology of Salix Hybrid[J].Journal of Hydroecology,2022,43(6):102-107. |
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| Authors: | GAN Li-ping WANG Xiao-nian CAO Xu-yue YANG Ling |
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| Abstract: | To explore the effects of flooding stress on the morphology, physiological indicators and anatomical structure of Salix hybrids providing the reference data to vegetation restoration in the hydro-fluctuating zone of the Three Gorges Reservoir,the current year"s Salix hybrid cutting seedlings with the same growth were selected for water flooding treatment, semi-submerged group (SsG, water submerged plant rhizome, below the first leaf), the total submerged group (SG, the top leaf of the water submerged plant) and the control group (CK) were treated. After 210 days, growth index,physiological indexes and root slices to observe the anatomical structure were measured.The results showed that after flooding, the stem height of SsG group was significantly higher than that of the other two groups, there were many raised and hypertrophy lenticels on the stem, and a large number of aerial roots were formed at the base of the stem of SsG group. The root coefficient of SsG group was significantly higher than CK group. The blade was narrow line, leaf length-to-width ratio significantly increased of SsG group. Stem height and root coefficient of SG group were significantly reduced, leaves became smaller curl, thickening of the brittle slightly transparent, the color was red, from lanceolate to oval, and the leaf length-to-width ratio was significantly reduced. Compared with the CK, the chlorophyll content of the SsG group showed an upward trend after flooding, and the SG group showed a downward trend. The chlorophyll a/b values of the two flooding treatments both increased significantly. After flooding, the soluble sugar in leaves and roots, soluble protein content in leaves, and Pro content in roots and leaves of SsG group were not significantly different from CK. Only the soluble protein in roots was significantly lower than CK. Under SG conditions, the content of soluble protein and soluble sugar in both leaves and roots were significantly reduced, but Pro content increased significantly. After flooding, the root epidermis of the SsG group was slightly incomplete, partially disintegrated, the intercellular space of the cortex expanded, and aerated tissues formed. The root tissue cells of the SG group were significantly damaged, and most of the pericyal and cortical cells dissociated, and the xylem cells was relatively loose, the cells became larger, and the marrow rays are not obvious. It shows that SsG promotes the growth of plant ground diameter to a certain extent, while SG has a significant inhibitory effect on root system and plant height growth. It suggests that Salix hybridsshould be located in the upper half of the drop zone elevation, which can better adapt to the flooding cycle of the reservoir area"s drawdown zone. |
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| Keywords: | Salix hybrid flooding stress Three Gorges reservoir area physiology and biochemistry root anatomy |
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