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Gibberellin3 처리에 따른 현사시 나무 도장 효과의 형태적 분석
최령임 ( Choe Lyeong Im ),허은운 ( Heo Eun Un ),박소영 ( Park So Yeong ),이재순 ( Lee Jae Sun ),이효신 ( Lee Hyo Sin ) 한국산림과학회 2003 한국산림과학회지 Vol.92 No.6
GA has been known to have many functions on plant growth and development. These include dormancy break, flower induction, and shoot elongation. In the present study, we examined the effects of GA3 on stem growth of poplar (xPopulus alba glandulosa) in a nursey. GA3 at the concentration of 0.2 to 20mg/ml stimulated shoot elongation on the tissue culture derived seedlings as well as the plants originated from root suckers. Although GA₃ stimulated the elongation of shoots, it did not increase the number of nodes on the shoots suggesting that the majority of the shoot growth was due to the elongation, not to new cell division. While GA₃ doubled the growth of both cells in the internode and thereby the internode itself. In some cases, it also caused the reduction in chlorophyll contents and both fresh and dry weight of the stems. Abnormal leaf shape was another notable characteristic of GA₃ treated plants. It even appeared in the plants treated with the lowest concentration (0.2mg) of GA3. If we use leaf abnormalty as the indicator of exogenous GA₃, activity on plants, we might be able to draw the following conclusions : 1) the GA3 effects last at least till the 8 or 9th new leaf develops on the plants, and 2) GA₃ did not seem to move downward from the apical bud where exogenous GA₃ was treated.
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