Abstract
Origin and development of adventitious roots in grape-cuttiugs were examined.
All root-primordia arose from between the outer part of newly formed xylem and phloem region, and no callus-roots were found in this examination.
It takes 30 days from insert of cuttiugs to the first root-primordia observed, and number of visible roots or root primordia was shown in Table 1.
The root-primodium shown in Fig. 4 was one of the smallest root-primordia which was observed in this examination, and the iniciation and development of root-primordia have specific optimum temperature respectively.
The root-primordia developed in the order from Fig. 4 to Fig. 12.
