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조동하 한국자원식물학회 1994 한국자원식물학회지 Vol.7 No.1
The effects of NaCl salinity on the leaf photosynthesis and water relation of two cultivars of rice(Oryza sativa L.) , the salt-tolerant cultivar Seohae and the salt-senstive cultivar Iri-380 were exam-ined. Two cultivars of rice were grown for 14 days in nutrient solution at SOmM NaCl. Comparing theieaf Na content of two cultlvars, Seohae showed high accumulation of Na content in the leaf blade, while Iri-380 showed low. The Na content in leaf blade reduced the rate of leaf photosynthesis. Salt-tolerant cultivar Seohae was less decreased the rate of leaf photosynthesis than salt- sensitive cultivarIri-380. And Seohae showed larger decreased the osmotic potential in the leaves than Iri-380. This in-dicates that in the salt-tolerant cultivar, osmotic adjustment is developed under saliniEation.
취나물류의 물질생산과 광합성특성에 관한 연구 II. 수분스트레스하에서 고온 및 저온처리가 취나물류의 광합성속도에 미치는 영향
조동하 한국자원식물학회 1998 한국자원식물학회지 Vol.11 No.3
The response of water stree under high and low temperatures, was shown differently according to the longer the suspension period of water supply. Leaf photosynthetic rate(LPS), leaf water potential(WP), relative leaf water content and relative soil water content were lower. At the higher temperatures, the percentate of reduction in LPS and WP was greater than at low temperatures. It is suggested that evaporation rate should be higher in the high temperature than the lower temperature. Also leaf water potential was lower at high temperature than at low temperature. After the 9 th day of treatment , LSP was remarkably reduced at high temperature, but the reduction of LPS was not significant at low temperature. Solidago virga-aurea var. asiatic that maintained LPS of 3rd day after treatment was more strong than other varieties at low temperatures. The silting and curling of leaves were observed symptoms of stress on the 9th day at the both temperatures. The leaves of aster scaber and Ligularia fischeri turned red on the 9th day after treatment at low temperature.
취나물류의 물질생산 및 광합성 특성 I. 취나물류의 포장재배시 차광 및 시비조건에 따른 광합성속도의 차이
조동하 한국자원식물학회 1998 한국자원식물학회지 Vol.11 No.1
The photosynthetic rate (LPS)in the field was higher in the non-shading condition than in the shading. The fertilizer application was somewhat higher than non-fertilizer application. After humus application at 50% sading condition the growth and LPS increased with Ligularia fischeri. The maximum LPS at 80% shading was 22.3${\mu}{\textrm}{m}$mol/m/s with N-fertilizer application . Except Aster tataricus and Solidago virge-aurea. var. asiatic where the maximum LPS at non-shading and N-fertilizer application were 38.68 and 35.28${\mu}{\textrm}{m}$mol/m2/s. While the maximum LPS of Aster scaber was 30.01${\mu}{\textrm}{m}$mol/$m^2$/s at non-shading and non-fertilizer application. the growth rate was higher shading and fertilized conditions than non-shading and non-fertilized . The most effective shading condition was 50% , but leaf ration was highest in the 80% . But a. tataricus was favorable at non-shading and N-feritlized conditions.
시비수준의 차이가 야콘의 물질생산과 광합성속도에 미치는 영향
조동하 한국자원식물학회 1996 한국자원식물학회지 Vol.9 No.3
본 실험은 포장과 포트재배에서 토양시비수준(土壤施肥水準), 온도(溫度) 및 광조건(光條件下)에서 건물생산량과 광합성(光合成) 속도의 차이를 측정분석하여 야콘의 적정생장(滴定生長) 조건(條件)을 밝히고자 실시하였다. 1. 포장에서의 시비수준별 건물생장율은 무처리구 보다 퇴비구에서 높게 나타났으며, 구근의 건물중은 무처리구와 질소처리구와는 큰 차이를 보이지 않았다. 2. 최대 엽광합성 속도는 퇴비구(S-1)에서 17.3mg $CO_2gdm^{-2}s^{-1}$로 다른 질소 처리구 보다 높았으au, 무처리구의 엽광합성 속도가 가장 낮았다. 3. 광환경(光環境) 조건(條件)에 따른 퇴비구와 무처리구의 엽광합성 속도차이는 뚜렷하게 차이가 났으며 광포화점은 $1200{\pm}50{\mu}molm^{-2s^{-1}$이었다. 4. 광합성속도는 $34{\pm}3^{\circ}C$ 정도에서 높은 반면 $28^{\circ}C$ 정도 이하에서는 기공저항에 의하여 엽광합성 속도가 낮았다. This study was conducted to examine the dry matter production and leaf photosynthesis under different fertilizer application in Yacon(Polymnia sonchifolia)plants. Under field conditions, dry matter production of stable mature application plot(S-1) was much larger than non-treated control plot(CTL), but bulb dry weight of 10kg nitrogen application plot per 10a (N-10) was not differentiated from CTL. The maximum photosynthetic rates increased in Yacon plants grown at S-1 while in the rates of CTL reduced under glasshouse in the same treated pot condition. The optimum temperature for the highly photosynthetic rates is about $34{\pm}3^{\circ}C$, and the rates did decrease by stomatal resistance below 28℃. The estimated light saturation point was $1200{\mu}mol{\cdot}m^{-2}s^1$. The results of this study indicate that soil conditions were highly related to dry matter production and leaf photosynthesis rate in Yacon plants.