Seed Dormancy, Germination Environment, and Seed Structure of Lehmann Lovegrass, Eragrostis lehmanniana Nees1
- L. Neal Wright2
Seed of the cultivar ‘A-68’ and 36 lines of Lehmann lovegrass, Eragrostis lehmanniana Nees, were investigated to identify and characterize seed (caryopsis) dormancy with respect to determination of pattern and degree. Development of the optimum germination environment and study of seed structure were emphasized. Freshly harvested seed varied among lines from no dormancy to complete dormancy. Dormancy decreased in a linear pattern for 100 weeks after harvest. Cylinder scarification was the most effective and simplest to control of all treatments to overcome dormancy. Many treatments were not effective. Optimum germination environment consisted of alternating temperatures of 20 C with 16 hr of darkness and 30 C with 8 hr of light with Eaton and Dikman no. 617 or Whatman no. 2 filter paper substrate. Differences were not observed in the origin of structural parts of the fruit coat among lines. Dry weights of water-extractable gelatinous seed-surface were not related to seed dormancy and removal of the gelatinous seed-surface did not overcome seed dormancy. Variability was found among lines for presence and quantity of known, identified, and unidentified chemical compounds of seed extracts. Seed dormancy differences were not attributable to chemical differences of eed extracts.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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