Overcoming dormancy in Helianthus annuus achenes and Echinacea purpurea seed
| Title: | Overcoming dormancy in Helianthus annuus achenes and Echinacea purpurea seed |
| Author: | Smith, Crystal Lea |
| Abstract: | In this study , seed quality factors of Helianthus annuus L . and E . purpurea were investigated as well as the effects of carotenoid inhibiting herbicides on their germination ability . The intent was to find a method of overcoming seed dormancy without compromising shelf life . Viability testing for H . annuus resulted in a germination percent of 57 % and a germination percent of 63 % for E . purpurea . Seed quality testing focused on size , density , Hull :Embryo (H :E ) and age . Carotenoid inhibitors were applied to the seed as a soak for varying lengths of time and at differing concentrations to determine their effectiveness on overcoming seed dormancy . Volume of E . purpurea seeds and H . annuus achenes increased with increasing density . H :E of H . annuus increased with increasing achene density . The surface area of a H . annuus achene hull can be used to predict the surface area of an embryo . For H . annuus , between H :E , surface area and density , density appears to be the best predictor of germinability . Age had more of an impact on germinability of E . purpurea seed than density . Carotenoid inhibitor treatments alone were not sufficient in overcoming dormancy in H . annuus . Discoloration of treated seedlings that germinated showed signs of herbicide damage indicating that the herbicide is able to penetrate the seed coat . Further study is needed . Germination rate and percent were improved for E . purpurea seed treated with fluridone and norflurazon at concentrations between 0 .005 g /L and 0 .020 g /L at soak times between 4 to 8 hours . |
| URI: |
http : / /hdl .handle .net /2346 /1416
http : / /hdl .handle .net /2346 /1416 |
| Date: | 2006-09-05 |
Citation
(2005-11-27).
Overcoming dormancy in Helianthus annuus achenes and Echinacea purpurea seed.
Master's thesis,
Texas Tech University. Available electronically from
http : / /hdl .handle .net /2346 /1416
.
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