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酸枣种子生物学特性研究

Study on Biological Characteristics of Wild Jujube Seeds

  • 摘要: 对酸枣种子的形态特征和影响种子发芽的因素进行了系统研究。结果表明,酸枣种子由倒生胚珠发育而来,质量约0.04 g,含水量约8.26%,种体呈扁心形,含有种皮、胚乳和胚3部分结构,酸枣种皮有黄、紫红和褐色等3种基本颜色。种皮作为机械结构妨碍种体吸水,在种体的种脐和发芽口部位吸水强烈。从种体自身来看,种皮内水溶性物质、种体老化抑制种子发芽,胚乳对发芽起支持作用;大种体不利于发芽,小种体有利于发芽;种皮颜色越深,种子发芽率越低。从培养条件来看,适合酸枣种子发芽的培养条件是含水量高、25℃、pH值7~8、无营养供应(营养盐、葡萄糖)、有光线照射。

     

    Abstract: In this paper, the morphological characteristics and the influencing factors of wild jujube seed germination were systematically studied. The results showed that the wild jujube seed was developed from anatropous ovules with a mass of about 0.04 g and water content of about 8.26%. The wild jujube seed was flat heart-shaped and contained three parts, seed coat, endosperm and embryo. The wild jujube seed coat had three basic colors: yellow, purple and brown. The seed coat, as a mechanical structure, obstructed the water absorption of the seed, and the water absorption was strong in the hilum and the germination port. From the perspective of seed itself, water-soluble substances in the seed coat and seed aging inhibited seed germination, while endosperm supported seed germination. Large seed was not conducive to germination, while small seed was conducive to germination; the darker the seed coat, the lower the seed germination rate. In terms of culture conditions, the suitable culture conditions for germination of wild jujube seeds were high water content, 25 ℃, pH 7-8, no nutritional supply(nutrient salts, glucose), and light exposure.

     

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