狭叶薰衣草嫩枝生根的解剖结构变化及生理响应机制

Anatomical Variation and Physiological Response Mechanism of Shoot Rooting of Lavandula angustifolia

  • 摘要: 通过L16(44)嫩枝扦插正交试验,确定狭叶薰衣草最优扩繁条件组合;并通过解剖学及生理学研究,揭示狭叶薰衣草嫩枝生根的解剖结构变化及生理响应机制。结果表明:狭叶薰衣草嫩枝扦插优化扩繁条件最优水平组合为A3B1C2D3(即基质配比为珍珠岩/草炭土6∶4,插穗采枝条顶部,插穗长度为10 cm,生根粉浓度为1000 mg/kg,成团率为100%,出圃时间为19 d);插穗部位是对成团率影响最大的因素,生根类型为诱生根原基、生根方式属混合型生根,且愈伤组织的形成与不定根的产生彼此独立;可溶性蛋白质、MDA和SOD间均存在显著相关或极显著相关,POD同SOD、MDA间存在显著相关。植物扦插扩繁的生根效果与是否存在潜伏根原基并无必然联系,而取决于其茎部结构特征等生物学特性和营养物质在逆境胁迫下对植物酶保护系统活性及MDA含量动态变化的响应机制。

     

    Abstract: Based on the L16(44) orthogonal test of shoot cutting propagation, the most optimized multi-factors combination for the propagation can be recognized. Through anatomical and physiological studies, the changes of anatomical structure and physiological response mechanism of shoot rooting of Lavandula angustifolia were revealed. The results show that the most optimal level combination for shoot cutting propagation of L. angustifolia is A3B1C2D3(the ratio of the proportion of substrate pearlite and peat soil is 6∶4 and cutting taken from the top, cutting length was 10 cm, ABT concentration to 1000 mg/kg, with 100% root balls forming and 19 d spending). The cuttings position on branch make great effects for root balls forming rate. Root primordia is originated by induced pattern, and mixed rooting mode produce the roots. The callus formations of the cutting base are independent from the adventitious roots production. Soluble protein, MDA and SOD were significantly correlated or very significantly correlated, and POD was significantly correlated with SOD and MDA. The rooting effect of plant cutting propagation is not necessarily related to the existence of latent root primordium. The metabolism of nutrition responding to plant enzyme protection system activity and MDA under various environmental stresses during the different development stages of root cutting is the predominant factor for rooting.

     

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