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孟柱善 한국식물학회 1977 Journal of Plant Biology Vol.20 No.2
The inhibitory effect of ethephon on the flowering in Lemna perpusilla 6746 was shown to be related to sucrose concentrations and dilution factors of Hutner's medium. When grown in 1/10-strength Hutner's medium under 10(14) cycles, the plants have been completely inhibited in the floral induction by ethephon(>5ppm) in the presence of sucrose(>20 mM) in the medium. However, in a less diluted Hutner's medium (1/2-strength), the inhibition of flowering by ethephon was observed to be partially diminished by sucrose at a high concentration(30 mM), while a low concentration of sucrose enhanced the inhibitory effect of ethephon in flowering. As inductive dark periods were extended, the effects of both compounds were partially nullified. Since no significant amount of ethylene possibly released in ethephon decomposition in the medium was detected, the inhibitory effect of ethephon in flowering was postulated to be exerted only through ethylene production within the plants. Plants were incubated in 10 ppm ethephon-containing medium during either dark or light periods, singly or periodically. The most effective single treatment with ethephon was observed during the 4th dark period, when formation of floral stimulus was assumed to be completed beyond a critical level. This postulation can be partially supported by a fact that the plants should be exposed to at least more than four consecutive 10(14) cycles for flowering.
Pharbitis nil 개화 유도시 (誘導時) 엽단백질 변화에 대한 면역학적 분석
맹주선 (Jue Son Maeng) 한국식물학회 1982 Journal of Plant Biology Vol.25 No.4
Using double immunodiffusion and immunoelectrophoretic techniques, attempts were made to detect any protein changes in leaf tissues of a short-day plant, Pharbitis nil Chois, variety Violet during floral induction under 8 hr light, 16 hr dark cycles. Immunoprecipitin systems showed at least four proteins newly appeared in the induced leaf tissues. Accumulation of the proteins were observed as the induction proceeded.
무기질소원의 종류에 따른 남조류 (藍藻類) Anabaena flos - aquae 광합성의 특성
맹주선 (Jue Son Maeng) 한국식물학회 1982 Journal of Plant Biology Vol.25 No.4
The kinetics of ^14C fixation have been investigated in Anabaena flos-aquae growing on NH^+_4, NO^-_3 and N_2-N in batch cultures. Growth rate was highest with NH^+_4, followed by NO^-_3 and finally N_2. The compensation intensity(I_0) and the half-saturation irradiance(K_1) with N_2 were higher than with other N sources, but the maximum C fixation rate(P_max) was lower. The P_max/K_1 ration, which is analogous to quantum efficiency at low irradiance ranges, was also lower with N_2. All these parameters except K_1 decrease with culture age, or decreasing growth rate. Since ^14C uptake measures net photosynthesis, the higher values of I_0 and K_1, and the low values of P_max and P_max/K_1 ratio with N_2 appear to be related to the high energy demand of N_2 fixation. They may also be related to the low maximum growth rate with N_2-N.