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Publication Date
1981
Description
Specific leaf weight (SL W, dry weight/unit leaf area) may serve as a selection criterion for forage yield through a positive rela• tionship with photosynthesis. Two cycles of phenotypic selection for high and low SLW were conducted in reed canarygrass (Phalaris anmdinacea L.) to investigate direct and correlated responses, particularly those related to yield and quality of forage. In a space-planted test, average direct responses from two cycles of selection for high and low SLW were 23% and 19%, respectively. Significant correlated responses were obtained for ten traits. Compared with the low-SLW cycle-2 population, the high SLW cycle-2 population averaged 52% higher in SLW, 38% greater in leaf thickness, 13% greater in leaf width, 12% higher in CO,-exchange rate, 24 % higher in leaf elongation rate, 38 % lower in tillers/plant, 83 % higher in dry weight/tiller, 39 % higher in dry-matter yield/plant, 15 % greater in plant height, 55 % higher in seed yield/plant, and 22 % higher in 100-seed weight. These results suggested that SL W reflected some basic aspect of plant growth and development. In solid stands, the high- and low-SLW cycle-1 populations did not differ significantly in forage yield when harvested either three or five times/yr. No consistent dilierences were found between high- and low-SLW populations in percentages of in-vitro dry-matter digestibility, neutral and acid detergent fiber, hemicellulose, cellulose, permanganate lignin, silica, and insoluble ash in nonflowering regrowth.
Citation
Carlson, I T.; Christensen, D K.; and Pearce, R B., "Selection for Specific Leaf Weight in Reed Canarygrass and Its Effects on the Plant" (1981). IGC Proceedings (1981-2023). 11.
(URL: https://uknowledge.uky.edu/igc/1981/section1/11)
Archival?
Archival
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Selection for Specific Leaf Weight in Reed Canarygrass and Its Effects on the Plant
Specific leaf weight (SL W, dry weight/unit leaf area) may serve as a selection criterion for forage yield through a positive rela• tionship with photosynthesis. Two cycles of phenotypic selection for high and low SLW were conducted in reed canarygrass (Phalaris anmdinacea L.) to investigate direct and correlated responses, particularly those related to yield and quality of forage. In a space-planted test, average direct responses from two cycles of selection for high and low SLW were 23% and 19%, respectively. Significant correlated responses were obtained for ten traits. Compared with the low-SLW cycle-2 population, the high SLW cycle-2 population averaged 52% higher in SLW, 38% greater in leaf thickness, 13% greater in leaf width, 12% higher in CO,-exchange rate, 24 % higher in leaf elongation rate, 38 % lower in tillers/plant, 83 % higher in dry weight/tiller, 39 % higher in dry-matter yield/plant, 15 % greater in plant height, 55 % higher in seed yield/plant, and 22 % higher in 100-seed weight. These results suggested that SL W reflected some basic aspect of plant growth and development. In solid stands, the high- and low-SLW cycle-1 populations did not differ significantly in forage yield when harvested either three or five times/yr. No consistent dilierences were found between high- and low-SLW populations in percentages of in-vitro dry-matter digestibility, neutral and acid detergent fiber, hemicellulose, cellulose, permanganate lignin, silica, and insoluble ash in nonflowering regrowth.
