variability in soybean agronomic performance traits in response to 41 C heat and high relative humidity seed stress

dc.contributor.advisor Susana Goggi
dc.contributor.advisor Reid G. Palmer Rolling, Ruth
dc.contributor.department Agronomy 2018-08-11T10:21:04.000 2020-06-30T02:43:40Z 2020-06-30T02:43:40Z Sun Jan 01 00:00:00 UTC 2012 2013-06-05 2012-01-01
dc.description.abstract <p>Incorporation of genetic diversity into soybean [Glycine max (L.) Merr.] cultivars can be used to increase yield and plant adaptation to stresses. Genetic variation has been found in commercial soybean cultivars, but using a seed stress to generate intra-cultivar variation has not been studied. The first objective of this study was to use seed stress in an attempt to generate variation in soybean agronomic traits of field stand, plant maturity, plant height, seed size, seed yield, seed protein content, seed oil content, seed standard germination and seed vigor. The second objective was to evaluate if changes in variation were heritable. Seed of two soybean cultivars, `BSR 101' and `Jack' were stressed using a modified version of the accelerated aging protocol, at 41°C for 48 hours, after which seeds immediately were hand-planted in the field near Ames, Iowa. Heritability of agronomic traits in the second generation was measured in two growing seasons, and at two locations, near Ames, Iowa, and Missouri Valley, Iowa. In 2010, cultivars exhibited increased variance and a mean increase in seed yield in response to the seed-stress treatment. In second generation plots variance did not change for all traits, but both cultivars had a mean increase in plant stand. In 2011, variance did not change for all traits in response to seed stress, but mean values decreased in all traits. In the second generation plots, there was a mean increase in plant stand and seed yield, but variance did not change. Results were subject to genotype by environment interactions, causing differences between growing seasons and cultivars. We found increase variation, large ranges in the agronomic trait values within treatments, and increased performance of agronomic traits in response to a seed stress treatment. This treatment can therefore be used to induce variation, which will aid in selection of superior plants from within already established soybean cultivars, to improve yield and other agronomic traits.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 3584
dc.identifier.contextkey 4186310
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/12577
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 19:24:42 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.keywords Agronomic
dc.subject.keywords Seed
dc.subject.keywords Soybean
dc.subject.keywords Stress
dc.subject.keywords Variability
dc.title variability in soybean agronomic performance traits in response to 41 C heat and high relative humidity seed stress
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a Crop Production and Physiology (Seed Science) thesis Master of Science
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