Genetic and Physiological Studies of the Rate and Duration of Seed Fill in Soybeans
Guffy, Richard Douglas
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/71636
Description
Title
Genetic and Physiological Studies of the Rate and Duration of Seed Fill in Soybeans
Author(s)
Guffy, Richard Douglas
Issue Date
1987
Department of Study
Agronomy
Discipline
Agronomy
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Agronomy
Abstract
Soybean cultivars which had significant genetic differences in the duration of the seed filling period were identified by screening the soybean germplasm collection. Correlations between various measures of the seed filling period, flowering, maturity, seed growth rate, seed dry weight, seed number per unit land area and yield were made. Yield was significantly and positively correlated with long durations of seed filling and seed number. Long durations of seed filling were positively and significantly correlated with large seed and late maturity. The effect of maturity (E) and stem termination (Dt) alleles on the duration of seed filling was evaluated using near isogeneic lines, but the alleles evaluated did not significantly contribute to genetic differences for the rate or duration of individual seed filling. However, stem termination alleles greatly affected the number of days between reproductive growth stages R5 and R7.
Crosses were made between parents which differed in the duration of seed filling, maturity, stem termination, seed size, seed growth rate and yield. The F$\sb{2}$ and parental populations were evaluated for the duration of seed filling, seed growth rate and seed size. In general, genetic variation for the duration of the seed filling periods and the seed growth rate was low in the F$\sb{2}$ population. Parental differences in the rate and duration of seed fill were the most important characteristics which influenced variance for these traits in the F$\sb{2}$ populations.
Seasonal net leaf CO$\sb{2}$ exchange rate (CER) and N assimilation was evaluated in 2 cultivars with long and 2 with short durations of seed filling. Cultivars with long durations of seed filling maintained measurable CER rates for a longer time after flowering. The N status of the plant did not appear to control genotypic differences in the duration of the seed filling period in these cultivars.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
