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Title:Variation in Water Absorbing Capacities of Soybean (Glycine Max (L.) Merr.) Seeds
Author(s):Ragus, Lolita Nunez
Department / Program:Agronomy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Agriculture, Agronomy
Abstract:Variation in water absorbing capacity (WAC) of soybean seeds is manifested by the presence of both soft (swollen) and hard seed that do not change in size under certain soaking conditions. Variation in WAC also occurs within soft seeds and within hard seeds though it may not be visible. Knowledge of the effects of hereditary and environmental factors on variation in WAC is important to research workers concerned with soybean production and with the processing of seeds for soy foods.
The present study dealt with four areas of research on variation in WAC, namely: (1) evaluation of WAC, percentage hard seeds and seed size in 1270 plant introductions from maturity groups I, II, III, and IV; (2) variation in and relationships among WAC and other seed traits in 33 genotypes grown in two seasons at one location; (3) inheritance of WAC in two sets of reciprocal crosses between high and low WAC types; and (4) effects of seed coat morphology and soaking time on WAC, seed germination and seedling vigor.
From a total of 1270 plant introductions in maturity groups I, II, III and IV average WAC of genotypes increased from maturity group I (116.25) through IV (130.53). Percentage hard seeds, however, decreased from I (10.47) through IV (1.50).
High heritability estimates (broad sense) for WAC in the F(,2)'s of reciprocal crosses of softseeded parents, Vinton x PI 378.679 (h('2) 0.81) and PI 407.812 x PI 417.006 (h('2) 0.67) indicated high genotypic variance for WAC variation. Heritability estimates for variation among samples of whole seeds from F(,2) plants (PI 407.812 x PI 417.006) averaged 0.84 while those of cotyledons (seed coats removed) averaged 0.62 suggesting the genetic influence of both seed coats and cotyledons on WAC.
Sealing of seed parts with beeswax confirmed the controlling effect of seed coat on water absorption by seeds. Seed coats and micropyles were better sites for water entry than hila. More open and large pores in the inner tissue of seed coats were observed in softseeded than in hardseeded types by means of the scanning electron microscope.
Greater variation was observed in the first 4-hr of sequential soaking than after 4-hr in all seed types. The maximum WAC was at 116 hr for all types. Leaching of proteins from seeds might involve two processes or tissues. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UMI
Issue Date:1984
Description:156 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984.
Other Identifier(s):(UMI)AAI8502275
Date Available in IDEALS:2014-12-16
Date Deposited:1984

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