海棠果插穗扦插生根过程解剖学观察

The Anatomical Observation on the Rooting of the Cutting of Malus prunifolia Borkh

从解剖学角度观察了海棠果插穗不定根的发育过程,结果表明:(1)海棠果2年生插穗茎内无潜伏根原基,不定根由诱生根原基发育形成,诱生根源于初生射线与维管形成层交汇处细胞的分裂分化。大约经15 d,不定根原基发育为幼小不定根并伸出周皮之外。(2)愈伤组织内有些细胞分化为具螺纹加厚的厚壁细胞,在愈伤组织内未发现根原基。

Malus prunifolia Borkh grows much faster than its homogeneities. Its flowers are provided with gorgeous characteristics, and possess great ornamental quality. The method of vegetative propagation was taken to produce seeding at present. In this article,the developmental course of the adventitious roots from cutting of M. prunifolia Borkh was observed with the anatomical method. The results showed as follows： （1） There was no incubate root primordium in cuttings of M. prunifolia Borkh,which was two years old. The induced root primordium developed into the adventitious root,and originated from the division and differentiation of the vascular cambium cell touching with the pith ray. After 15 days,adventitious root primordia developed into young adventitious roots. （2） The callus could not form an adventitous root primordium,and only form much sclerenchyma. The next step of the investigation will be stressed on the physiological mechanism of adventitious root from cutting of M. pruni f olia.