Methods for enhancing seed germination of eastern gamagrass

dc.contributor.author Rogis, Carla
dc.contributor.department Agronomy
dc.date 2020-11-22T06:51:28.000
dc.date.accessioned 2021-02-26T09:06:58Z
dc.date.available 2021-02-26T09:06:58Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2002
dc.date.issued 2002-01-01
dc.description.abstract <p>Eastern gamagrass (Tripsacum dactyloides, L.) is a perennial grass species that is highly productive, has sufficient forage quality, and can be used to reduce soil erosion from croplands, but is grown on a limited land area in the U.S. Problems with stand establishment have been a major restraint to its adoption. These establishment problems in eastern gamagrass result, at least partially, from a very strong seed dormancy. The seed dormancy mechanisms of this species are not yet fully understood. A better understanding of the inhibitors to gamagrass seed germination and development of methods for breaking the seed dormancy could lead to management strategies that result in more widespread use of this promising warm-season grass. This thesis reports methods tested for breaking seed dormancy in eastern gamagrass and new insight into the dormancy mechanisms in this species. In one study, eastern gamagrass seed germination after treatment with a combination of two known germination promoters - moist, pre-chilling and gibberellic acid (GA) - was compared to germination after moist, pre-chilling alone and no pre-chilling. GA3 provided an increase in rate of germination but not overall germination and was able to reduce dormant seed in these lots from 73% to 3%. In a second study, solid matrix priming methods for eastern gamagrass seed were developed for three solid materials. Water uptake into eastern gamagrass seeds was determined at various water potentials in each material. Solid matrix priming systems were then designed to hydrate eastern gamagrass seed to levels that would stimulate the early phases of germination while restricting advancement into later stages of germination. Germination of eastern gamagrass seed was observed after 7 d of conditioning in each of the three solid materials hydrated at either high or low water potentials with water, buffered GA3 solution, unbuffered GA3 solution, or buffer solution alone to determine if any of these systems could break dormancy. GA3 was able to significantly increase the germination of eastern gamagrass compared to water treated seed, but only to levels of 20% of all live seed.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/21306/
dc.identifier.articleid 22305
dc.identifier.contextkey 20252472
dc.identifier.doi https://doi.org/10.31274/rtd-20201118-270
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/21306
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/98673
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/21306/Rogis_ISU_2002_R645.pdf|||Fri Jan 14 22:36:31 UTC 2022
dc.subject.keywords Agronomy
dc.subject.keywords Crop production and physiology
dc.title Methods for enhancing seed germination of eastern gamagrass
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
thesis.degree.discipline Crop Production and Physiology
thesis.degree.level thesis
thesis.degree.name Master of Science
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