论文部分内容阅读
块根是由侧根或不定根发育膨大而成,它是适于贮藏养料的一种肉质贮藏根。根内薄壁组织特别发达,并贮藏多量的淀粉或其它种类的碳水化合物,像甘薯、大丽菊、豆薯等植物在地下都有这样的块根。今以甘薯为例叙述块根的构造和形成。甘薯根的初生构造与一般双子叶植物相似,在不定根中常具有4～5束辐射角(木质部束),在木质部束与中央导管分子之间和木质部束内导
Roots or roots by adventitious root development and expansion from it, it is suitable for storage of nutrients in a meat storage roots. Root parenchyma particularly developed, and store large amounts of starch or other types of carbohydrates, such as sweet potato, Dahlia, bean and other plants have such underground roots. This sweet potato as an example to describe the structure and formation of roots. The primary structure of sweet potato roots is similar to that of common dicotyledons. In adventitious roots, there are often 4 to 5 radiation angles (xylem bundles) between the xylem bundles and the central catheter and between the xylem bundles