Study on the Difference of Seed Germination and Salt Tolerance of Four Brassica napus varieties in Xizang
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摘要: 为研究西藏不同品种油菜种子的萌发特性及耐盐性差异，通过模拟盐胁迫环境，测定油菜种子在NaCl溶液浓度为0、50 mmol/L、100 mmol/L、150 mmol/L、200 mmol/L、250 mmol/L、300 mmol/L处理下的发芽指标、形态指标和生理指标，比较不同油菜品种发芽期的耐盐性，并采用隶属函数法进行综合评价。结果表明，参试油菜品种种子发芽指标、形态指标随着NaCl浓度的增加，呈现下降或先增加后下降趋势；不同NaCl浓度处理下，大地95油菜种子的平均发芽率、平均发芽势、平均发芽指数和萌发指数均最高；对4个品种油菜种子相对发芽率随着NaCl浓度变化趋势进行拟合分析，结果表明，三元多项式模型拟合的决定系数最大，拟合效果最好，最佳的拟合方程为y=ax3+bx2+cx+d;大地95的半致死浓度、90%致死浓度均高于其余油菜种子；大地95隶属函数值最高，耐盐性最好。Abstract: To study the germination characteristics and salt tolerance differences of four Brassica napus seeds in Xizang, the germination, morphological, and physiological indicators of the four Brassica napus varieties were measured under simulated salt stress environments with NaCl solution concentrations of 0, 50 mmol/L, 100 mmol/L, 150 mmol/L, 200 mmol/L, 250 mmol/L and 300 mmol/L. The salt tolerance of the four Brassica napus varieties during germination was compared, and a comprehensive evaluation was conducted using a membership function. The results showed that the germination and morphological indicators of the four Brassica napus varieties showed a decreasing or first increasing and then decreasing trend with the increase of NaCl concentration. Under different NaCl concentrations, the average germination rate, average germination potential, average germination index and germination index of Brassica napus seeds in Dadi95 were the highest. The ternary polynomial model had the highest coefficient of determination and the best fitting effect in fitting the trend of relative germination rate of four Brassica napus seeds with NaCl concentration changes. The best fitting equation was y=ax~3+bx~2+cx+d. The half lethal concentration and 90% lethal concentration of Dadi95 Brassica napus seeds were higher than those of the other three Brassica napus seeds. The membership function value of Dadi95 was the highest and had the best salt resistance.
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Keywords:
- salt tolerance /
- seed germination /
- Brassica napus
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