Effects of auxin and irradiance on the rooting of cuttings of Pinus sylvestris [aeration, adventitious root formation, 3-indolylbutyric acid]
1980
Stroemquist, L.-H. | Hansen, J. (Umeaa Univ. (Sweden). Dept. of Plant Physiology)
Seedlings of Pinus sylvestris L. were grown under controlled conditions (temperature 20 deg. C, photoperiod 17 h) at two irradiances, 8 or 40 W m('-2). Hypocotyl cuttings were excised and rooted at different irradiances in tap water solutions of indolebutyric acid (IBA). The fastest rooting and highest rooting percentage were obtained with cuttings from stock plants grown at 8 W m('-2) and treated with 10('-5)M IBA for 21 days. The concentration of 10('-4)M IBA inhibited root formation. In comparable treatments rooting was always better in cuttings from stock plants grown at 8 W m('-2) than in cuttings from stock plants grown at 40 W m('-2). The irradiance during the rooting period had only a minor influence on rooting. When cuttings from plants irradiated with 40 Wm('-2) were treated with 10('-5)M IBA for 21 days the rooting percentage almost reached the same level as in untreated cuttings from stock plants given 8 W m('-2). In cuttings treated with IBA during the whole rooting period, rooting was depressed in comparison to untreated cuttings. Aeration of the 10('-4)M IBA solution increased the rooting percentage, but aeration had no effect on untreated cuttings and on cuttings treated with lower IBA concentrations.
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