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昆虫蛀食对卷果涩荠种子萌发特征的影响

Effect of Insect Boring on the Germination Characteristics of Seeds of Malcolmia scorpioides.

  • 摘要: 为探究油菜筒喙象蛀食对短命植物卷果涩荠种子萌发特征的影响,本研究以蛀食和非蛀食卷果涩荠根茎产生的种子为材料,研究在不同温度和干旱胁迫下的种子萌发特性。结果表明,不同温度对油菜筒喙象蛀食后卷果涩荠种子萌发率无显著影响,但高温和低温条件抑制了卷果涩荠种子的萌发速率;油菜筒喙象蛀食后缩小卷果涩荠种子萌发温度阈值,但拓宽了卷果涩荠种子的亚适温范围,加快了卷果涩荠的萌发速率。干旱胁迫推迟卷果涩荠种子的萌发时间,油菜筒喙象蛀食增强了卷果涩荠种子抗旱性,使其表现出更高萌发率。

     

    Abstract: To explore the effects of boring by Lixus ochraceus on the seed germination characteristics of the short-lived plant Malcolmia scorpioides. Seed produced from the rhizomes of bored group and unbored group was used to study the characteristics of seed germination under different temperature and drought stress. The results showed that different temperatures had no significant effect on the seed germination rate of Malcolmia scorpioides. after the boring, but high temperature and low temperature conditions inhibited the seed germination rate of Malcolmia scorpioides. The temperature threshold of seed germination of Malcolmia scorpioides was reduced after boring by L. ochraceus. But at the same time, the suboptimal temperature range of the seeds was widened, and the seed germination rate was accelerated. Drought stress delayed seed germination of Malcolmia scorpioides, while being bored by L. ochraceus enhanced the drought resistance of seeds of Malcolmia scorpioides, showing higher germination rate.

     

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