1 材料与方法
1.1 材料
1.2 方法
1.3 数据处理
2 结果与分析
2.1 PEG胁迫对椰枣种子萌发的影响
表1 不同PEG浓度处理对椰枣种子萌发的影响Tab. 1 Effects of PEG concentration on seed germination of date palm |
| 处理Treatments | 品种 Varieties | 发芽率Germination rate/% | |||||
|---|---|---|---|---|---|---|---|
| 10 d | 15 d | 20 d | 25 d | 30 d | 35 d | ||
| CK | Sewi | 20.00±1.25a | 30.00±1.63c | 50.00±2.94c | 76.00±2.05b | 96.00±1.63a | 96.00±1.63a |
| Helali | 19.00±0.82a | 30.00±2.49c | 48.00±2.94c | 73.00±1.41b | 95.00±1.69a | 95.00±1.69a | |
| Khadrawy | 19.00±1.25a | 31.00±1.25c | 50.00±3.68c | 75.00±2.45b | 96.00±1.25a | 96.00±1.25a | |
| 15% PEG | Sewi | - | 40.00±2.45b | 60.00±3.29b | 73.00±3.27b | 89.00±1.63a | 89.00±1.63a |
| Helali | - | 40.00±3.30b | 56.00±0.82b | 71.00±5.90b | 87.00±0.82b | 87.00±0.82b | |
| Khadrawy | - | 50.00±4.92a | 72.00±4.19a | 82.00±5.35a | 93.00±0.47a | 93.00±0.47a | |
| 25% PEG | Sewi | - | 13.30±0.83e | 40.00±3.29c | 47.00±3.27c | 47.00±2.45c | 47.00±2.45c |
| Helali | - | 12.00±0.94e | 33.00±0.82d | 39.00±1.25d | 44.00±1.69c | 44.00±1.69c | |
| Khadrawy | - | 17.00±1.25d | 45.00±2.05c | 50.00±2.16c | 51.00±5.10c | 51.00±5.10c | |
| 35% PEG | Sewi | - | - | - | 13.30±1.63f | 20.00±3.27e | 20.00±3.27e |
| Helali | - | - | - | 10.00±0.82f | 17.00±2.60e | 17.00±2.60e | |
| Khadrawy | - | - | - | 18.00±2.50e | 27.00±1.25d | 27.00±1.25d | |
| 45% PEG | Sewi | - | - | - | - | - | - |
| Helali | - | - | - | - | - | - | |
| Khadrawy | - | - | - | - | - | - | |
注:不同小写字母表示相同时间不同处理间差异显著(P<0.05)。-表示未发芽。 | |
Note: Different lowercase letters represent significant difference between different treatments at the same time (P<0.05). -indicates no germination. |
2.2 PEG胁迫对椰枣幼苗生长指标的影响
表2 不同PEG浓度处理对椰枣幼苗和根长的影响Tab. 2 Effect of PEG concentration on seedling and root length of date palm |
| 品种 Varieties | 鲜株重Fresh weight/g | 根长Root length/cm | |||||
|---|---|---|---|---|---|---|---|
| CK | 15% PEG | 25% PEG | CK | 15% PEG | 25% PEG | ||
| Sewi | 3.10±0.36Aa | 2.60±0.47Aa | 2.40±0.50Aa | 7.17±0.29Cb | 9.33±0.29Bc | 13.08±0.34Aa | |
| Helali | 1.40±0.10Ab | 0.93±0.17Bb | 0.70±0.10Bb | 6.8±0.53Bb | 180±2.03Ab | 10.00±2.56Ba | |
| Khadrawy | 2.43±0.47Aa | 1.26±0.06Bb | 1.04±0.070Bb | 9.88±0.71Ca | 34.33±0.83Aa | 13.00±1.96Ba | |
注:不同大写字母表示相同品种不同处理间差异显著(P<0.05);不同小写字母表示相同处理不同品种间差异显著(P<0.05)。 | |
Note: Different uppercase letters indicate significant difference among different treatments of the same variety (P<0.05); Different lowercase letters indicate significant difference among different varieties in the same treatment (P<0.05). |
2.3 椰枣幼苗对渗透胁迫的生理生化指标响应
表3 不同品种椰枣幼苗经PEG处理后的细胞膜相对透性Tab. 3 Cell membrane permeability of date palm seedlings by PEG treatment % |
| 品种Varieties | CK | 15% PEG | 25% PEG | ||
|---|---|---|---|---|---|
| 细胞膜相对透性 Cell membrane permeability | 相对减量 Relative reduction | 细胞膜相对透性 Cell membrane permeability | 相对增量 Relative growth | ||
| Sewi | 14.77±0.90Ba | 10.56±0.67Ca | 28.50 | 24.56±0.71Aa | 66.30 |
| Helali | 13.06±0.57Bb | 9.38±0.51Ca | 28.20 | 19.38±0.59Aa | 48.40 |
| Khadrawy | 12.70±0.69Bb | 10.23±1.05Ca | 19.40 | 17.43±0.90Ab | 37.20 |
注:不同大写字母表示相同品种不同处理间差异显著(P<0.05);不同小写字母表示相同处理不同品种间差异显著(P<0.05)。 | |
Note: Different uppercase letters indicate significant difference among different treatments of the same variety (P<0.05); Different lowercase letters indicate significant difference among different varieties in the same treatment (P<0.05). |
表4 不同品种椰枣幼苗经PEG处理后脯氨酸含量的变化Tab. 4 Proline content of date palm seedlings by PEG treatment |
| 品种Varieties | CK /(µg·g-1) | 15% PEG | 25% PEG | ||
|---|---|---|---|---|---|
| 脯氨酸含量 Proline content/(µg·g-1) | 相对增量 Relative growth/% | 脯氨酸含量 Proline content/(µg·g-1) | 相对增量 Relative growth/% | ||
| Sewi | 126.89±2.92Ca | 152.04±1.72Bb | 19.80 | 197.14±1.71Ab | 55.40 |
| Helali | 131.68±1.36Ca | 172.12±5.57Ba | 30.70 | 245.91±2.98Aa | 86.70 |
| Khadrawy | 115.97±1.40Cb | 160.03±2.75Bb | 37.80 | 239.83±5.66Aa | 106.80 |
注:不同大写字母表示相同品种不同处理间差异显著(P<0.05);不同小写字母表示相同处理不同品种间差异显著(P<0.05)。 | |
Note: Different uppercase letters indicate significant difference among different treatments of the same variety (P<0.05); Different lowercase letters indicate significant difference among different varieties in the same treatment (P<0.01). |
表5 不同品种椰枣幼苗经PEG处理后丙二醛含量的变化Tab. 5 MDA content of date palm seedlings by PEG treatment |
| 组织 Tissue | 品种 Varieties | CK /(nmol·g-1) | 15%PEG | 25%PEG | ||
|---|---|---|---|---|---|---|
| MDA含量 MDA content/(nmol·g-1) | 相对增量 Relative growth/% | MDA含量 MDA content/(nmol·g-1) | 相对增量 Relative growth/% | |||
| 叶 | Sewi | 155.85±6.70Cb | 210.00±6.26Bb | 34.70 | 285.99±4.37Ac | 83.50 |
| Helali | 171.14±1.48Ca | 221.23±7.25Ba | 29.30 | 326.70±0.97Aa | 90.90 | |
| Khadrawy | 168.75±3.03Ca | 205.96±1.54Bb | 22.10 | 307.47±5.71Ab | 82.20 | |
| 根 | Sewi | 110.84±3.37Cb | 159.46±2.72Bb | 43.90 | 193.07±1.42Ab | 74.20 |
| Helali | 125.99±0.99Ca | 190.97±18.45Ba | 51.60 | 224.63±13.00Aa | 78.30 | |
| Khadrawy | 122.37±3.37Ca | 168.02±3.67Bb | 37.30 | 203.96±1.14Ab | 66.70 | |
注:不同大写字母表示相同品种不同处理间差异显著(P<0.05);不同小写字母表示相同处理不同品种间差异显著(P<0.05)。 | |
Note: Different uppercase letters indicate significant difference among different treatments of the same variety (P<0.05); Different lowercase letters indicate significant difference among different varieties in the same treatment (P<0.05). |
2.4 不同PEG浓度处理对椰枣幼苗渗透胁迫的生理生化指标相关性分析
图1 椰枣幼苗生理生化指标相关性分析图R分析图右上部分数字代表指标的相关性定量分析;左下部分点状图代表指标的相关性定性分析。 Fig. 1 Correlation analysis of physiological and biochemical indexes of date palm seedlings The upper right part of the R analysis chart represents the correlation quantitative analysis of indicators; The dot chart at the lower left represents the qualitative analysis of the correlation of indicators. |
