scholarly journals Effect of Valinomycin and Gramicidin D on the Reflection Coefficient of Soybean Root Systems

1980 ◽  
Vol 65 (1) ◽  
pp. 74-77 ◽  
Author(s):  
Albert H. Markhart ◽  
Aubrey W. Naylor
Keyword(s):  
Reflection Coefficient ◽  
Root Systems ◽  
Soybean Root ◽  
Gramicidin D

A biochemical study of BAS 517 using excised corn and soybean root systems

Weed Science ◽  
1999 ◽  
Vol 47 (1) ◽  
pp. 28-36
Author(s):  
Hwei-Yiing Li ◽  
Chester L. Foy
Keyword(s):  
Root System ◽  
Biochemical Study ◽  
Lipid Fraction ◽  
Root Systems ◽  
Water Soluble ◽  
Root Tips ◽  
Soybean Root ◽  
Corn Roots ◽  
Tracer Techniques ◽  
High Degree

The mode of action of BAS 517 in a susceptible plant species, corn, was investigated using an excised root system and14C-tracer techniques. The root system of a tolerant species, soybean, was used for comparison. When UL-14C- glucose was used as a precursor,14C incorporation into lipids was reduced in BAS 517-treated corn roots, although14C incorporation from UL-14C-glucose into lipids was relatively low. Inhibition of14C incorporation into water-soluble compounds was not definite because of a high degree of variability. Using14C-acetate as a precursor, 49, 43, and 34% of the recovered radioactivity was found in the lipid fractions of root tips treated with 0, 1.0, and 10 μM BAS 517, respectively. In nontreated soybean root tips, 47% of the recovered radioactivity was found in the lipid fraction compared to 49% in root tips treated with 10 μM BAS 517. Further analysis of lipids showed that BAS 517 inhibited the incorporation of14C from14C-acetate into phosphatidylethanolamine, a phospholipid, whereas the labeling of sterols in treated corn roots was not adversely affected. Acetyl CoA carboxylase extracted from root systems of corn and soybean showed different sensitivity to BAS 517, suggesting its role as the herbicide target site and as a basis for the selectivity.

scholarly journals Penetration of Soybean Root Systems by Abscisic Acid Isomers

1982 ◽  
Vol 69 (6) ◽  
pp. 1350-1352 ◽  
Author(s):  
Albert H. Markhart
Keyword(s):  
Abscisic Acid ◽  
Root Systems ◽  
Soybean Root

Field Competition Between Tall Morningglory and Soybean. II. Development and Distribution of Root Systems

Weed Science ◽  
1976 ◽  
Vol 24 (5) ◽  
pp. 454-460 ◽  
Author(s):  
H. D. Scott ◽  
L. R. Oliver
Keyword(s):  
Interspecific Competition ◽  
Root System ◽  
Intraspecific Competition ◽  
Root Length ◽  
Root Systems ◽  
Planting Density ◽  
Silt Loam ◽  
Soybean Root ◽  
Ipomoea Purpurea ◽  
Plant Densities

Studies of the development and distribution of root systems of intraspecific and interspecific competition were conducted between soybean [Glycine max.(L.) Merr. ‘Lee 68′] and tall morningglory [Ipomoea purpurea(L.) Roth]. Tall morningglory at three plant densities and soybean were grown for 2 yr on a Taloka silt loam. The greatest density of soybean and tall morningglory roots grown under intraspecific competition was in the surface 12 cm and in the center of the row. Greater values of root length and density were during the dryer season. The largest fraction of total root length at a given date also was in the surface 12 cm and decreased with depth. The fraction at a given depth was a dynamic property of the root system during the growing season. When compared with the soybean root system, tall morningglory roots were found at deeper depths and had greater root densities. Little expansion of the soybean root system was found after initiation of the soybean reproductive phase. During this phase, the tall morningglory root system was increasing at a faster rate of growth than the soybean root system. The greatest density of roots grown under interspecific competition also was in the surface 12 cm and at the center of the row. These values were less than those found under intraspecific competition. Root distribution and development are dynamic functions of growth stage, planting density, and plant species.

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