PDF(Pubmed)
Abstract：
Nicosulfuron-resistant biotype (R) and -sensitive biotype (S) Amaranthus retroflexus L. seeds were subjected to different temperature, light, salt, osmotic potential, pH value and burial depth treatments. The difference in germination response of two populations to the above abiotic environmental factors was used to study the fitness cost of nicosulfuron-resistance evolution in A. retroflexus. The aim is to find a powerful tool for weed control in the presence of evolutionary resistance selection. The results of this experiment showed that the germination rate and germination index in S population were generally higher than that in R population. When the salt stress was 80 mM, the water potential was -0.1 Mpa ~ -0.4 Mpa, and under strong acid and alkali conditions, the germination index in S population was prominently higher than that in R population (p<0.05). The delayed seed germination in R population indicated that its nicosulfuron resistance may be linked to seed biochemical compositions that altered seed germination dynamics. The resistant and sensitive biotype of A. retroflexus had differently favourable adaptability in diverse environments. Salt, osmotic potential and pH value are not the major constraints for A. retroflexus germination, however, A. retroflexus are strongly responsive to temperature, light and burial depth. Considering that seeds of A. retroflexus are unable to reach the soil surface beyond the depth of 6 cm, deep inversion tillage before sowing may be an effective and economical weed management tool for the control of nicosulfuron resistant A. retroflexus.
摘要：
耐烟磺隆的生物型（R）和敏感型（S）的苜蓿种子经受不同的温度，光,盐,渗透势，pH值和埋深处理。利用两个种群对上述非生物环境因子的发芽反应差异，研究了反屈曲烟磺隆抗性进化的适应性成本。目的是在存在进化抗性选择的情况下找到一种有效的杂草控制工具。本试验结果表明，S群体的发芽率和发芽指数普遍高于R群体。当盐胁迫为80mM时，水势为-0.1Mpa~-0.4Mpa，在强酸和强碱条件下，S群体的发芽指数显著高于R群体(p<0.05)。R种群中种子萌发的延迟表明其对烟磺隆的抗性可能与改变种子萌发动力学的种子生化成分有关。抗性和敏感型的反弯曲杆菌在不同环境中具有不同的适应性。盐，渗透势和pH值不是反曲萌发的主要制约因素，然而,A.后屈肌对温度有强烈的反应，光线和埋葬深度。考虑到A的种子无法到达土壤表面超过6厘米的深度，播种前的深层倒置耕作可能是一种有效，经济的杂草管理工具，可用于控制抗烟磺隆。
