不同品种亚麻种子萌发期抗旱性鉴定

Drought Resistance Identification of Different Flax Varieties in Seed Germination Stage

为了评价不同亚麻品种萌发期的抗旱性,采用PEG-6000模拟干旱胁迫条件,研究不同PEG-6000浓度下11个亚麻品种的发芽势、发芽率、芽长、萌发指数和活力指数。结果表明,随着PEG-6000浓度的提高,不同品种亚麻种子的上述指标均呈下降趋势,当PEG-6000浓度达到25%时,种子不发芽;20%PEG-6000浓度对亚麻萌发期抗旱性鉴定指标影响明显,为合适的干旱胁迫条件。在20%PEG-6000浓度下,对11个亚麻品种的相对发芽势、相对发芽率、相对芽长、萌发指数和活力指数进行测定,结合隶属函数法鉴定出耐旱型品种3个:黑亚14、黑亚16和New;较耐旱型品种2个:黑亚19和Argtha;中间型品种3个:黑亚20、双亚13和Diane;干旱较敏感型品种2个:黑亚11和黑亚18;干旱敏感型品种1个:黑亚17。该研究为亚麻抗旱种质资源鉴定评价、抗旱性品种选育及抗旱性机理研究奠定了理论基础。

In order to evaluate the drought resistance of different flax varieties,PEG- 6000 was used to simulate drought stress in this experiment. Germination energy,germination rate,bud length,germination index and vitality index were studied under different PEG- 6000 concentrations. Results showed that all of these indices decreased with increasing of PEG- 6000 concentration and seeds germination were stopped when PEG- 6000 concentration reached 25%. The 20%PEG- 6000 concentration had a significant influence on the drought resistance identification indices of flax at germination stage,and was suitable for drought resistance identification. After relative germination energy,relative germination rate,relative bud length,germination index and vitality index of 11 flax varieties were determined under20% PEG- 6000 concentration combined with membership function method,three drought tolerant varieties（ HY14,HY16,New）,two relatively drought tolerant varieties（ HY19,Argtha）,three intermediate type varieties（ HY20,SY13,Diane）,two relatively drought sensitive varieties（ HY11,HY18）,and one drought sensitive varieties（ HY17）were identified out. The results will provide theoretical basis for breeding drought resistant varieties and drought resistance mechanism.