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.

To produce several high-quality species of Chwinamul (Aster scaber, A. Tataricus, Ligularia fischeri), leaves of the plants grown in different natural habitats were anlayzed. Contents in vitamin C and β-carotene were generally higher in plants grown in the field. However, Aster scaber picked form Yongwol and A. tataricus from Mt.Taryong contained relatively higher vitamin c and β carotene. Crude protein and fat contents varied depending on the growing area. Ca content was markedly higher in the plants grown in the natural havitats.

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 22.3μmmol/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 35.28μmmol/m2/s. While the maximum LPS of Aster scaber was 30.01μmmol/m2/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.

몇가지 생장조절제, 온도 및 광 조건의 차이에 의한 취나물류(참취, 개미취, 수리취 미역취 곰취)의 발아특성을 살펴본 결과는 다음과 같다. 1. 수리취는 암조건에서, 곰취, 참취, 개미취, 미역취는 명조건에서 발아율이 더 높았다. 2. 생장조절제를 처리한 종자는 명조건에서 참취를 제외한 4종의 발아율이 2-10% 향상되었다. 생장조절제 가운데 BA가 가장 효과적이었으며 무처리에 비하여 수리취에서 33%, 곰취에서 20%, 개미취에서 7% 발아율을 향상시켰다. 2. 명조건에서 발아일수는 곰취가 14일로서 가장 길었고 수리취 10일, 개미취 8일, 참취 7일, 미역취 5일 순이었다. 무처리에 비하여 생장조절제 처리구에서는 곰취, 참취, 미역취에서 각각 1일씩, 개미취와 수리취에서 각각 2일씩 단축되었다. 3. 생장조절제를 처리한 종자는 암조건에서 무처리에 비하여 7-29% 발아율이 향상되었으며 BA가 가장 효과적이었다. 4. 무처리에 비하여 암조건의 생장조절제처리구에서는 개미취 (2일), 수리취(1일), 곰취(1일)의 발아일수가 길어진 참취는 5일이 단축되었다. 수리취를 제외한 나머지 4종의 취나물류 종자의 발아일수는 BA처리에서 1-5일 단축되었다. 5. 참취는 10℃, 수리취와 곰취는 15℃, 개미취와 미역취는 25℃에서 가장 높은 발아율을 나타냈으며 발아에 효과적인 BA의 적정 농도는 수리취가 200ppm, 곰취와 개미취가 100-150ppm, 참취가 100ppm이었고 미역취는 BA농도에 따른 발아율 차이가 인정되지 않았다.