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ALGAE > Volume 10(1); 1995 > Article
ALGAE 1995;10(1): 51-57.
Effects of Plant Growth Regulators on Growth in the Various Explants of Undaria pinnatifida (Harvey) Suringar
Jong Chon Lee, Woong Young Soh, Jong Hwa Lee
Department of Biology, Chonbuk National University, Department of Aquaculture, Kunsan National University
ABSTRACT
The effect of 2,4-D, IAA, NAA and kinetin on the growth of blade, midrib, sporophyll and holdfast explants in Undaria pinnatifida of Wan-do were investigated from February to March 1991. Each plants was cultured for 4 weeks on PESI medium supplemented with 2,4-D, IAA, NAA and kinetin, from 10 super(-4) M to 10 super(-8) M concentrations, respectively. In the blade explants, the most effective concentrations on the growth was commonly 10 super(-6) M in 2,4-D, IAA, NAA and kinetin. Also growth was promoted at lower concentrations (10 super(-6) M - 10 super(-7) M) and, in general, inhibited at a high concentration (10 super(-4) M). In the midrib explants treated with 2,4-D, IAA and NAA, growth was not promoted. On the contrary, in those treated with 10 super(-5) M - 10 super(-7) M of kinetin, the growth was promoted. The most effective concentration on the growth was 10 super(-7) M of Kinetin. In the sporophyll explants, the most effective concentrations on the growth was commonly 10 super(-5) M in 2,4-D, IAA and NAA. But treated with kinetin, growth was not promoted. In the holdfast explants, the most effective concentrations on the growth was 10 super(-5)M in 2,4-D, 10 super(-5) M in IAA, 10 super(-6) M in NAA and 10 super(-6) M in kinetin. At a high concentration (10 super(-4)) of four growth regulators, in general, the growth in holdfast explants was inhibited while at lower concentrations (10 super(-5) M - 10 super(-6) M), the growth was promoted. As a rule, growth of various explants was promoted at low concentrations (10 super(-6) M - 10 super(-7) M), whereas growth was inhibited at a high concentration (10 super(-4) M). Growth of various explants treated with 2,4-D, IAA, NAA and kinetin was in order of blade>holdfast>sporophyll>midrib.
Key words: growth, Undaria pinnatifida,2,4-D, IAA, NAA, kinetin


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