| 肖斌,郭树江,李亚,李得禄,王飞.干旱胁迫下4种一年生植物种子萌发特性及抗旱性评价[J].干旱地区农业研究,2025,(5):26~33 |
| 干旱胁迫下4种一年生植物种子萌发特性及抗旱性评价 |
| Seed germination characteristics and drought resistance evaluation of four annual plants under drought stress |
| |
| DOI：10.7606/j.issn.1000-7601.2025.05.03 |
| 中文关键词: 荒漠草本植物 一年生植物；干旱胁迫；萌发特性；抗旱性评价 |
| 英文关键词:desert herbaceous plant annual plant drought stress germination characteristics drought resistance evaluation |
| 基金项目:中央引导地方发展专项（2424ZYQA052）；国家地区科学基金（32360271,32360329）；中央林业草原生态保护恢复资金项目（甘林规函\[2024\]755号） |
|
| 摘要点击次数: 298 |
| 全文下载次数: 110 |
| 中文摘要: |
| 为了解干旱胁迫对一年生荒漠草本植物种子萌发的影响，以民勤荒漠绿洲过渡带典型植物雾冰藜（Bassia dasyphylla）、白茎盐生草（Halogeton arachnoideus）、沙米（Agriophyllum squarrosum）、画眉草（Eragrostis pilosa）种子为试验材料，采用不同浓度PEG-6000溶液（5%、10%、15%、20%、25%、30%、35%）模拟干旱胁迫，研究了4种一年生草本植物种子萌发指标、生长指标和恢复萌发率对干旱胁迫的响应，并采用隶属函数法综合评价了4种植物种子萌发期的抗旱性。结果表明：（1）随着PEG-6000浓度的增加，4种植物种子萌发指标均呈显著下降趋势；当PEG-6000浓度分别为≥20%、30%、10%、30%时，雾冰藜、白茎盐生草、沙米和画眉草种子萌发受到显著抑制，与对照相比分别显著下降了14.66%~99.14%、65.71%~83.81%、5.00%~95.00%、44.86%~73.83%；沙米种子萌发势、萌发指数显著高于其他3种植物（P<0.05），白茎盐生草、雾冰藜种子活力指数显著高于其他两种植物（P<0.05）。（2）4种植物种子胚芽长、胚根长和鲜质量随PEG-6000浓度升高均呈下降趋势，当PEG-6000浓度≥10%时，雾冰藜、白茎盐生草、沙米和画眉草种子生长均受到显著抑制，与对照相比上述生长指标下降范围分别为21.57%~98.24%、17.48%~87.91%、16.64%~89.58%、12.86%~94.87%。（3）干旱胁迫解除后，4种植物种子恢复萌发率存在差异，表现为雾冰藜＞画眉草＞沙米＞白茎盐生草。在5%~25% PEG浓度下，雾冰藜、白茎盐生草、沙米种子仍能恢复萌发；画眉草种子在各浓度下均能恢复萌发。（4）4种植物种子萌发期抗旱性强弱表现为白茎盐生草＞沙米＞雾冰藜＞画眉草。 |
| 英文摘要: |
| This study aimed to investigate the effects of drought stress on seed germination of annual desert herbaceous plants. The seeds of Bassia dasyphylla, Halogeton arachnoideus, Agriophyllum squarrosum, and Eragrostis pilosa in the Minqin Desert Oasis Transitional Zone were used as experimental materials. PEG-6000 of different concentrations was applied to simulate drought stress. The response of germination indicators, growth indicators,and germination recovery rate of four annual herbaceous plant seeds to drought stress was analyzed, and the drought resistance of four plant seeds was evaluated comprehensively by the subordinate function method. The results showed that: (1) As PEG-6000 concentration increased, the germination indices of all four plant species declined significantly. When PEG-6000 concentrations were≥20%, 30%, 10%,and 30%, seed germination of B. dasyphylla, H. arachnoideus, A. squarrosum, and E. pilosa was significantly inhibited. Compared to the control, their germination rates decreased markedly by 14.66%~99.14%, 65.71%~83.81%, 5.00%~95.00%, and 44.86%~73.83%, correspondingly.The germination potential and germination index of A. squarrosum seeds were significantly higher than those of the other three species (P<0.05), while the vitality index of H. arachnoideus and B. dasyphylla seeds was significantly higher than that of the other two species (P<0.05).(2) The germ length, radicle length, and fresh mass of four plant seeds decreased with increasing PEG-6000 concentrations. When PEG-6000 concentration was ≥10%, the growth indicators of B. dasyphylla, H. arachnoideus, A. squarrosum, and E. pilosa seeds were significantly inhibited, showing reductions of 21.57%~98.24%,17.48%~87.91%, 16.64%~89.58%, and 12.86%~94.87%, respectively, compared to the control group. (3) After drought stress relief, recovery germination rates varied among the species, ranked as B. dasyphylla > E. pilosa > A. squarrosum > H. arachnoideus. Seeds of B. dasyphylla, H. arachnoideus, and A. squarrosum could resume germination at PEG concentrations of 5%~25%, while E. pilosa seeds exhibited recovery germination across all tested concentrations.(4) The drought resistance of the seeds of four plants during germination was as follows: H. arachnoideus > A. squarrosum > B. dasyphylla > E. pilosa. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| | |