Persistence of southern turfgrasses in a shade environment1
- C.W. Winstead and
- C.Y. Ward
Shade imposes a severe limitation on the selection of a turf grass for the southern United States. To define more clearly the effects of shade on turf species, anatomical, morphological, and physiological changes were measured for ‘Tiflawn’ bermudagrass [Cynodon dactylon (L.) Pers.] (a nonshade tolerant species) and St. Augustinegrass [Stenotaphrum secundatum (Walt.) Kuntze] (a shade tolerant species) when grown under two light environments (full sun and approximately 70% shade). Attention was also given to the selection of an indicator which could be used by plant breeders when screening turfgrasses for shade tolerance.
Although the anatomy of leaf blades of bermudagrass and St. Augustinegrass differ, shading caused only minor changes within a species. Leaf and internode lengths of both grasses generally increased when grown in a shade environment, while leaf width decreased in bermudagrass and increased in St. Augustinegrass with reduced light intensity. Total nonstructural carbohydrate reserves decreased in both species as a result of the shade environment. An increase in the total chlorophyll content of the grasses grown in the shade environment substantiated the observation that grasses grown under shaded conditions were darker green. Net photosynthesis and dark respiration decreased significantly in bermudagrass grown in the shade environment, but no difference was noted in St. Augustinegrass. No characteristic was found that could be used as a consistent indicator for shade tolerance of bermudagrass or St. Augustinegrass. Additional index words: Shade, Photosynthesis, Respiration, Chlorophyll, Carbohydrate.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1974. . Copyright 1974 by the American Society of Agronomy, Inc. and the Crop Science Society of America, Inc., 5585 Guilford Rd., Madison, WI 53711 USA