The Effects of Stage of Seedling Development on Selected Physiological and Morphology Parameters in Kentucky Bluegrass and Red Fescue
- J. V. Krans and
- J. B. Beard
Net photosynthesis, dark respiration, distribution of 14C-photosynthate, and selected morphological parameters were monitored in seedlings of ‘Merion’ Kentucky bluegrass (Poa pratensis L.) and ‘Pennlawn’ red fescue (Festuca rubra L.) at 1-week intervals for a 10-week period in environmentally controlled plant growth chambers. Elucidation of these inherent physiological and morphological changes may lead to improved turfgrass vigor and quality through adjustments in cultural practices (fertilization, irrigation, clipping, pesticide application. . .) which coincide with specific time sequences found to be critical.
Lateral shoot development occurred after the third leaf stage (3 weeks after seedling emergence) in red fescue and after the fifth leaf stage (3 to 4 weeks after seedling emergence) in Kentucky bluegrass. Tillers were initiated in the axils of leaves below fully expanded leaves in both species. Tiller development preceded rhizome initiation in red fescue. Tillers and rhizomes were not initiated preferentially in Kentucky bluegrass. Accelerated dark respiration and high percent leaf dry weights occurred for 2 weeks after seedling emergence in both species. Net photosynthesis was greatest I week following seedling emergence in both species. A high percent of the 14C-photosynthate shifted from the leaves to stems between the 2nd and 3rd weeks after seedling emergence in Kentucky bluegrass and the 3rd and 4th weeks after seedling emergence in red fescue. The stem fractions remained the dominant sinks for 14C-photosynthate following the initial 14C-photosynthate shift in both species.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1980 by the American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, and International Turfgrass Society, 5585 Guilford Rd., Madison, WI 53711 USA