草业学报2012，Vol.21Issue(6)：23-29,7.
PEG模拟干旱胁迫对四种荒漠植物种子萌发的影响
Effects of drought stress simulated by PEG on seed germination of four desert plant species
摘要
Abstract
The seeds of four important desert plants: Haloxylon ammodendron , Reaumuria soongorica , Cera-toides latens and Suaeda glauca were collected from the Alashan arid desert, Inner Mongolia. The effects of drought stress on seed germination under PEG treatment and of germination recovery under optimal conditions after presoaking with PEG solution were studied in a series of laboratory tests. The germination and radical growth of the four desert plant species were subjected to different degrees of inhibition with reduced osmotic potential of a series of PEG solutions. The lower the osmotic potential, the more apparent the inhibitory effect. However, slight drought stress promoted the germination of R. soongorica, C. latens and S. glauca, improved the germination index of R. soongorica and S. glauca, and stimulated the radical growth of the four desert plants. The lowest thresholds of osmotic potential for germination were -3. 0 ( H. ammodendron) , - 2. 1 (R. soongorica and C. latens) and - 1. 5 MPa (S. glauca). H. ammodendron had the strongest drought resistance, and S. glauca, the weakest. Under optimal conditions, the seeds presoaked with PEG solution recovered their germination after drought stress was relieved. The seeds presoaked for longer suffered greater damage from drought stress, and at the longest times germination was suppressed completely. Shorter duration presoaking improved germination percentage and index of R. soongorica significantly, stimulated the radical growth of H. ammodendron, R. soongorica and C. latens, but suppressed the radical growth of S. glauca.关键词
干旱胁迫/荒漠植物/种子萌发/萌发恢复Key words
drought stress/ desert plant/ seed germination/ germination recovery分类
农业科技引用本文复制引用
杨景宁,王彦荣..PEG模拟干旱胁迫对四种荒漠植物种子萌发的影响[J].草业学报,2012,21(6):23-29,7.基金项目
国家科技支撑项目(2011BAD17B02)资助. （2011BAD17B02）
