POLYETHYLENE-GLYCOL SOLUTION CONTACT EFFECTS ON SEED-GERMINATION
POLYETHYLENE-GLYCOL SOLUTION CONTACT EFFECTS ON SEED-GERMINATION
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DOI：
10.2134/agronj1990.00021962008200060015x
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发表时间：
1990-11-01
期刊：
影响因子：
2.1
通讯作者：
HARDEGREE, SP
中科院分区：
文献类型：
--
作者：
EMMERICH, WE;HARDEGREE, SP
虽然聚乙二醇（PEG）溶液已被用于控制在许多种子发芽研究的水势，有一个问题，PEG溶液种子接触可能会减少种子发芽。 在四种草种上评价PEG溶液-种子接触对种子萌发的影响：禾本科燕麦[Bouteluoa curtipendula（Michaux）Torreyl，野燕麦[Cenchrus ciliaris L.]，Lehmann lovegrass [Eragrostis lehmanniana Nees]和Kleingrass [Panicum coloratum L.]。 建立了种子萌发的水势调控体系，控制PEG（8000 mol. 重量）溶液-种子接触。 种子在0.0 ~-1.62MPa的水势范围内在滤纸和纤维素膜上萌发。 水牛草和莱曼相思草21天发芽率和发芽率指数（GRI）不受PEG溶液种子接触。 在没有PEG溶液接触纤维素膜的情况下，燕麦格兰玛和Kleingrass表现出降低的发芽和GRI。 这种降低是由于种子-水-膜接触点处的导水率受PEG溶液水势和种子大小和形状的影响。 因此，可以得出结论，PEG溶液-种子接触不会降低种子萌发。
While polyethylene glycol (PEG) solutions have been used to control water potential in numerous seed germination investigations, there is concern that PEG solution-seed contact may reduce seed germination. The PEG solution-seed contact effect on seed germination was evaluated on four grass species: sideoats grama [Bouteluoa curtipendula (Michaux) Torreyl, buffelgrass [Cenchrus ciliaris L.], Lehmann lovegrass [Eragrostis lehmanniana Nees], and kleingrass [Panicum coloratum L.]. A water potential control system for seed germination was developed that controlled PEG (8000 mol. wt.) solution-seed contact. Seeds were germinated on filter paper and cellulose membrane over the water potential range of 0.0 to -1.62 MPa. Buffelgrass and Lehmann lovegrass 21-d germination and germination rate index (GRI) were not affected by PEG solution-seed contact. Sideoats grama and kleingrass showed reduced germination and GRI without PEG solution contact on the cellulose membrane. The reduction was attributed to the hydraulic conductivity at the seed-water-membrane contact point which was influenced by PEG solution water potential and seed size and shape. Therefore, it was concluded PEG solution-seed contact does not reduce seed germination.