Degree Type

Dissertation

Date of Award

1988

Degree Name

Doctor of Philosophy

Department

Agronomy

First Advisor

R. Brent Pearce

Abstract

A simulation model of maize kernel growth was developed. The model mechanically simulates endosperm differentiation and starch granule growth at the cellular level. Simulation begins with silking and ends when growth substrate (assimilatory and reserve) is exhausted;Endosperm differentiation is simulated on the basis of an empirical growth curve synthesized from various published sources. Meristematic and amyliferous cell proliferation are modeled separately. Starch and protein synthesis are modeled on the basis of published assimilate uptake rates, observed stoichiometry of C and N uptake in developing kernels, and published metabolic construction costs. A whole maize ear is simulated as a rectangular array addressed by position. Each position is simulated independently and an effect of position on kernel development is implemented;On the basis of the flux of C and N required by kernels to maintain cellular processes and starch granule growth, an assimilate "sink demand" is calculated. Currently, whole-crop maize simulators do not include an explicit sink component during the reproductive growth phase. This model would be a useful addition to these simulators.

DOI

https://doi.org/10.31274/rtd-180813-8883

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Ricardo J. Salvador

Language

en

Proquest ID

AAI8909190

File Format

application/pdf

File Size

369 pages

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