Graduate Thesis Or Dissertation
 

Seed dormancy, germination and seedling vigor of some Kentucky bluegrass (Poa pratensis L.) varieties as affected by environmental and endogenous factors

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  • Seed of Cougar and Newport Kentucky bluegrass (Poa pratensis L.) was harvested at Pullman and Spokane at several stages of maturity. Variations in seed attributes resulting from environmental and maturity effects were evaluated through germination tests, tetrazolium staining, seed moisture and seed weight determinations. Seedling vigor was determined by .speed of germination and seedling growth rate measurements. Inherent differences were observed between the two varieties. Cougar seed germinated higher initially and had greater seedling vigor compared to Newport. Stage of seed maturity at harvest did not significantly influence vigor. Post-harvest dormancy was more prevalent in Newport than Cougar and affected the relative performance of the two varieties when seedling vigor was evaluated. This dormancy dissipated with time. Endogenous germination rhythms of several months duration existed in both varieties. Two maximum and two minimum cycles occurred during the nine months after harvest. This attribute affected the expression of potential viability. The pattern was not influenced by germination temperatures, seed maturity or storage conditions. Oxygen absorption, water uptake and total respiration were not significantly affected by the seed coat nor appendages. These factors apparently did not produce the observed varietal variations. Inherent genetic variations in response to environmental variables accounted for performance differences.
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