Dissertation > Excellent graduate degree dissertation topics show

Studies on Turf Characteristics of Nannong Kentucky Bluegrass

Author: ChenChuanJun
Tutor: ShenYiXin
School: Nanjing Agricultural College
Course: Grassland
Keywords: South agricultural selected system Kentucky bluegrass Heat resistance Turf characteristics POD isozyme Antioxidant enzyme activities
CLC: S688.4
Type: Master's thesis
Year: 2005
Downloads: 152
Quote: 12
Read: Download Dissertation

Abstract

Kentucky bluegrass (Poa pratensi L.) with its long green period, fine texture, green color, cold resistance, densities and other characteristics are widely used in the green lawns of golf courses and other types of playground, courtyard and airport planting. Kentucky bluegrass heat prevalence of difficult summer, the summer heat of late summer season in our climate transition zone. Southern farmers selected lines are screened for this problem bred heat Kentucky bluegrass new lines. Agricultural selected lines of the south of the test and the application of more commercial grass bluegrass varieties were compared Nannong selected lines and commercial varieties peroxidase (POD) isozyme characteristics, growth and turf characteristics , summering performance differences, and initially explored the physiological mechanism of the more heat-resistant. POD isozyme results show that Southern farmers selected lines showed 13 enzyme bands, in addition to the six main enzyme-band common with the other 16 varieties of the test, also appeared in seven of its unique enzyme bands. POD isozyme information on the different varieties of dissimilarity class average cluster analysis, 17 tested varieties (lines) can be classified into 3 groups, including Southern farmers selected lines, the American varieties \each category. Accordingly speculated that the selected lines Nannong relatively distant kinship with other tested cultivars and species characteristics as a relatively independent lines. Compared with the current application of more commercial varieties, Southern farmers selected lines leaf texture, color, leaf length, chlorophyll content and the growth rate of the center; coverage and density, lawn quality excellent; stout rhizome, section number, tillering ability, summering. Southern farmers selected lines turn green in the spring and the summer stress during the growing season resumes in the fall performance are better than other varieties; lawn during the summering cover, density and tiller green leaf traits were significantly better than other varieties, the display on the summer heat of late summer season than good adaptability. Southern farmers selected lines is expected to become the summer heat applications in Kentucky bluegrass fine varieties. Summer under high temperature stress, the the tested cultivars physiological responses varies greatly. With the increase in the intensity of summer heat of late summer and the duration of the extension, all varieties of lawn cover, density, quality, chlorophyll content and tissue water content were last significant (p lt; 0.05) decline in mid-August, lawn comprehensive quality and leaf tissue water content were lower than in mid-June, 12.1-49.8% and 14.2-27.6%; mid-August leaf tissue superoxide dismutase (SOD) and POD activity were lower than in mid-June 36.5-55.0 % and 46.9-65.7%, while the content of malondialdehyde (MDA) increased by 19.8-88.7%. Field high temperature volt lawn quality and chlorophyll content, tissue water content, the decrease of SOD and POD activity, as well as leaf tissue MDA content increase under drought stress there was a significant (p lt; 0.05) difference among varieties. Than the high-temperature Nannong selected lines and Midnight (W) under duress significant variation (p lt; 0.05) is less than the heat-resistant varieties Bluechip, Sobra and heat medium varieties America and Midnight (B); summer lawn The comprehensive quality significantly higher than other varieties. Correlation analysis showed that field High temperature and drought stress on lawn quality and the decline of the leaf tissue POD activity was significantly (p lt; 0.05) negative correlation. High temperature and drought during the leaf tissue of the field to maintain a high water content and POD activity may be early grass

Related Dissertations

CLC: > Agricultural Sciences > Gardening > Ornamental Horticulture ( flowers and ornamental trees) > Garden Plant Cultivation and application technology > Lawns and ground cover plants
© 2012 www.DissertationTopic.Net Mobile