Full TGIF Record # 128062
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Web URL(s):http://img.kisti.re.kr/soc_img/society//tsk/JDHHBF/1989/v3n1/JDHHBF_1989_v3n1_24.pdf
    Last checked: 01/28/2013
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Publication Type:
i
Refereed
Author(s):Kim, Tae Ill; Ku, Ja Hyeong; Won, Dong Chan
Author Affiliation:Department of Horticulture, College of Agriculture, Cungnam National University, Taejeon, Korea
Title:Effect of paclobutrazol on growth, and high temperature and drought stress in perennial ryegrass
Source:Korean Journal of Turfgrass Science. Vol. 3, No. 1, 1989, p. 24-33 [178-187].
Publishing Information:Korea: Turfgrass Society of Korea
# of Pages:10
Keywords:TIC Keywords: Paclobutrazol; Growth rate; Temperature stress; Drought stress; Lolium perenne; Transpiration; Soil water content; Nitrogen level; Photosynthesis; Application rates; Growth factors
Cultivar Names:Omega II
Abstract/Contents:"This study was conducted to investigate the effect of paclobutrazol [(2 RS, 3 RS )-1-(4-chlorophenyl )-4,4-dimethyl-2-(1, 2, 4-triazol-1-yl )-pentan-03-01] on the tolerance of high temperature and drought stress as related to growth retardation, transpiration rate, soil water content, nitrogen level and photosynthetic rate in perennial ryegrass (Lolium perenne L. Omega 'II'). Plants were given a 30 ml soil drench of paclobutrazol at the concentrations of 0, 0.01, 0.1, 1.0, 10.0, mg/6.5cm-diameter pot. The results were as follows: 1. Increasing concentrations of paclobutrazol reduced plant height, leaf area, fresh weight and dry weight, but increased chlorophyll content per unit area. The number of tillers and leaf width were not affected by the paclobutrazol concentrations. 2. The proper concentration of paclobutrazol on growth retardation in perennial ryegrass was about 1 mg/pot, but leaf deformity and severe growth retardation were shown at high concentrations of 10 mg/pot. 3. Perennial ryegrasses grown at 30°C were shown significantly short plant height and low leaf nitrogen level compared with those grown at 20°C. Increasing concentrations of paclobutrazol at 20°C increased nitrogen level but it could not increase nitrogen level at 30°C. 4. During the drought stress, increasing temperatures significantly promoted transpiration rate and wilting time. It took about 5 days at 20°C and 3 days at 30°C to reach wilting time of leaves from water stress treatment. Soil water contents at wilting time of non-treated controls were averaged 6.87% at 20°C and 6.17% at 30°C. 5. Paclobutrazol reduced transpiration rate at high temperature and drought stress. Wilting appeared at the lower water content of soil according to increasing concentrations of paclobutrazol at 30°C but there were no differences among concentrations of at 20°C. 6. Paclobutrazol treatment at 1 mg/pot reduced injury rate of leaves from 67.1% and 100% in control plants to 15.7% and 80% at 20°C and 30°C, respectively. 7. Photosynthetic rate per unit area was significantly reduced at high temperature. Paclobutrazol stimulated photosynthetic rate with increase of concentrations at 20°C but there was no increasing effect at 30°C."
Language:Korean
References:20
Note:Abstract appears in English
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kim, T. I., J. H. Ku, and D. C. Won. 1989. Effect of paclobutrazol on growth, and high temperature and drought stress in perennial ryegrass. (In Korean, with English abstract.) Korean Journal of Turfgrass Science. 3(1):p. 24-33 [178-187].
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http://img.kisti.re.kr/soc_img/society//tsk/JDHHBF/1989/v3n1/JDHHBF_1989_v3n1_24.pdf
    Last checked: 01/28/2013
    Requires: PDF Reader
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