PEG模拟干旱胁迫对四种荒漠植物种子萌发的影响

摘要/Abstract

摘要： 试验以内蒙古阿拉善荒漠4种优势植物:梭梭、红砂、驼绒藜和碱蓬种子为材料,在-3.0～0 MPa 的PEG渗透势下,研究了干旱胁迫对种子萌发的影响,探讨了经PEG浸种预处理后种子的萌发恢复能力。结果表明,随PEG渗透势的下降,梭梭、红砂、驼绒藜和碱蓬种子的萌发和初生根生长均受到不同程度的抑制,总体来看,PEG渗透势越低,抑制作用越明显。但是,轻度的干旱胁迫能促进红砂、驼绒藜和碱蓬种子的萌发,提高红砂和碱蓬种子的发芽指数,刺激了4种荒漠植物的初生根生长。4种荒漠植物种子萌发的最低渗透势阈值分别为-3.0,-2.1,-2.1和-1.5 MPa,说明梭梭种子萌发的抗旱性最强,而碱蓬的抗旱性最弱。经PEG浸种预处理的种子在适宜条件下可以恢复萌发,但浸种时间越长,种子受干旱胁迫的影响越大,甚至其萌发完全被抑制。短时间的PEG浸种预处理提高了红砂种子的发芽率,并显著提高了其发芽指数,刺激了梭梭、红砂、驼绒藜的初生根生长,而碱蓬的初生根生长则一直受到PEG浸种预处理的抑制。

Abstract: The seeds of four important desert plants: Haloxylon ammodendron, Reaumuria soongorica, Ceratoides 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.

中图分类号:

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.

YANG Jing-ning, WANG Yan-rong. Effects of drought stress simulated by PEG on seed germination of four desert plant species[J]. Acta Prataculturae Sinica, 2012, 21(6): 23-29.

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