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.

This study was to investigate the dry weight, the amount of Na+ and K+ water potential and leaf photosynthesis rate in plants for determining the salt tolerance mechanism in rice cultivars on soil and solution culture with NaCl. The results obtained in this study are summarized as follows ; In general, rice cultivars, cv. Tetep and Jinbu, having high salt tolerance in ID(identified on dry matter production level) showed the higher salt tolerance in RGR (relative growth rate), compared with rice cultivars(cv. Nonglim 41ho, Dunraebyeo and Sobackbyeo) having low salt tolerance. The contents of Na in rice differed depending on culivars and plant parts. Tetep contained 2.9times higher amounts of Na+ than leaf blade and root part. High salt tolerance cultivar Obongbyeo showed a larger decrease in osmotic potential than low salt tolerance cultivar Dunraebyeo suggesting that osmotic adjustment was developed under salt stress conditions in a salt tolerant cultivar . In order to know the IY(identified on grain yeild level using rice cultivars having different salt tolerance the capacity of photosyntheiss was investigated. The capapcity of photosynthesis in cv. Tetep and Obongbyeo having high salt tolerance was much higher that in cv.Dunraebyeo and Nonglim 41 having low salt tolerance.

Development of shoot and root, leaf water potential and photosynthetic rate affected by water stress in early growing stage of tobacco were surveyed to interpret stress response in terms of plant physiological and agricultural aspects. The growth of shoot and root was highly suppressed by water stress and the difference in dry weight by rewatering was smaller in root than in shoot. The total root length was highly decreased by water stress and the lengths of root for water stress and non-stress were 74m and 84m, respectively, after rewatering. The root growth treated by water stress was increased between 2nd and 3rd day after treatment indicating that temporary water stress at early growing stage might have increased of root zone activity for early growth stage. The leaf water potentials were decreased to -7.63MPa, -9.47MPa, -11.89MPa, -13MPa at the 2nd, 3rd, 4th and 5th day by water stress. The relative water contents were 75%, 62% and 57% at the 3rd, 4th and 5th day after treatment. Photosynthesis was reduced largely by water stress. The photosynthetic rate after treatment at 2nd day and 3rd day was dropped to 18.15~mu mol. CO2 /m2 ㆍsec-1 and 9.35~mu mol. CO2 /m2 ㆍsec-1 . It was never recovered to the normal, even after rewatering. Stomatal conductance had been reduced since 2nd day after treatment and increased after rewatering.

This paper aims at creating the measurement of athletes` stress. About 340 athletes attending high schools or universities were selected as the subjects for the purpose of this study, but 316 of them were the real subjects for the ultimately operated data on the factors causing stress. Questionaires adapted from Competitive State Anxiety Inventory(CSAI) designed by Martens, Burton, Rivkin and Siman were used to put Competitive Anxiety Factor to the test ; questionaires included in Sports Cohesion Instrument (SCI) developed by Yukelson, Weinberg and Jackson were used to test Team Cohesion Factor ; questionaires presented in A Study on the Measurement of Job Stress (I) by Lee Jong-mok and Park.Han-ki were modified to be suitable for athletes and used to test communication factor and family factor. 54 questions were selected out of preliminary questionaires for testing the above -mentioned factors, and principal component factor was analyzed by means of Pearson correlation coefficient matrix on the basis of the responses to 54 questions. As a result, 12 factors and variable quantities that they could take turned out to be 60.20% . 47 questions, which had more than .30 as each factor loading in 12 factors, were selected out of 54. questions as a resultof Uarimax Rotated Factor Analysis of these 12 factors. The selected 12 factors game, counsel, sports-external disturbance, team cohesion, athletic sports, communication, training, spectators. We suggest that athletes undergo stress while they are under situations-competitive or ordinary-concerned with these 12 factors.