Anatomical and physiological aspects of rooting of Jasminum grandiflorum L. by stem cuttings [effect of growth regulators, time of year, cuttings taken, type of stem cuttings on rooting; detection of anatomical barriers to rooting; location of emergence of adventitious roots].
1989
Sari K.S.S.
Hard and soft wood cuttings of Jasminum grandiflorum L. were studied in two successive years 1987, 1988 at January, March, May, June and July, and treated separately with NAA, IAA, IBA, ABA and Alar at 0,500 and 1000 ppm. Cross section at base of cuttings during rooting were prepared to detect origin of adventitious root formation. The results indicated: hardwood cuttings prepared in January, March and May, and softwood cuttings prepared in June and July gave significantly higher number of rooted cuttings. On the other hand, cuttings treated with NAA during January and June and with Alar during March, May and July, as well as with IAA during July were significantly superior to other cuttings treated with other growth regulators. However, cuttings treated with 500 ppm in January, March, May and 1000 ppm in January, June, July gave significantly higher number of cuttings. Significant interaction was found between the three factors: cutting type, growth regulator type and concentration. In this respect softwood cuttings prepared in July treated with Alar at 500 ppm and 1000 ppm and NAA at 1000 ppm, IAA at 500 and 1000 ppm and IBA at 500 ppm gave significantly the highest number of cuttings. However, hardwood cuttings treated with IAA at 1000 ppm during June, Alar at 500 ppm in March and May, NAA at 500 and 1000 ppm in January, gave significantly the best results. On the other hand, rooting percentage in June and July was more than that in January, March and May. The anatomical study showed that there was a sclerechumatous sheath in the cortex of the stem cuttings and the origin of adventitious root formation is in the cortex region.
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