Dennis B. Egli

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Three cultivars of soybean (Glycine max [L.] Merr. cvs Harper, McCall, and Maple Amber) were grown in the field and kept continuously deflowered throughout the normal seedfill period. For all cultivars, deflowering led to delayed leaf abscission and a slower rate of chlorophyll loss. Compared to control plants, photosynthesis and ribulose 1,5-bis-phosphate(More)
The effects of source-sink alterations on the translocation patterns to soybean ("Fiskeby V") pods were studied using a pod leakage technique. The distribution of assimilates from a source leaf using double pulse experiments was followed at the pods at the source node and the node immediately below. Alterations were made by shading, illuminating, or(More)
Breeding for high seed protein concentration in soybean [Glycine max (L.) Merrill] often results in lower yield, but the basis for this negative relationship is not well understood. To address this question, we evaluated the N acquisition characteristics of three high protein and three normal soybean genotypes in the field for 3 years. Plants were grown in(More)
The effect of anoxia on subsequent uptake and transport of K, Rb, and Na was examined with seedlings of barley (Hordeum vulgare L.), corn (Zea mays L.), and tall fescue (Lolium x Festuca hybrid derivative) to further our understanding of xylem loading. Roots were incubated in solutions depleted of O(2) by flushing with N(2) gas. After 1 hour exposure,(More)
The abundances of ribulose-1,5-bisphosphate carboxylate/oxygenase (Rubisco) and ribulose-5-phosphate (Ru5P) kinase in field-grown soybean (Glycine max L. Merr.) leaves were quantified by a Western blot technique and related to changes in chlorophyll and photosynthetic capacity during senescence. Even though the leaf content of Rubisco was approximately(More)
In some soybean (Glycine max (L.) Merr.) cultivars, fruit removal does not delay the apparent loss of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco, EC 4.1.1.39) activity and abundance or the decline in photosynthesis. Analysis of leaf extracts from defruited plants indicated a time-dependent increase in both Rubisco activity and abundance in a(More)
Active polyamine metabolism occurs in Glycine max (L.) seeds during development. Most (>/=97%) of putrescine (Put), spermidine (Spd), spermine (Spm), and cadaverine (Cad) are present as free forms in the growing embryo. In the cotyledon or embryonic axis, Put decreases to a nearly undetectable level, while Spd level sharply increases as seed dry weight(More)
Radioactive photosynthetic assimilates, translocated to a soybean (Glycine max [L.] Merr. ;Fiskeby V') pod can be measured directly by excising the stylar tip of the pod under 20 mm ethylenediaminetetraacetate solution (pH 7.0) and allowing the material to leak into the solution. Pods at the source node received approximately 50% of the (14)C exported from(More)
Soybean (Glycine max (L.) Merr.) plants were grown at two levels of Ca (0.05 and 2.5 mM Ca) with and without an inorganic source of N in a growth chamber and in the greenhouse. The fourth leaf from the top of the plant was labeled with 14C, and the distribution of 14C was measured 24 hours after labeling. The translocation of 14C out of the labeled leaf was(More)
scribed by a normal distribution Understanding the survival characteristics of hybrid corn (Zea y 5 [1/s√2p]exp[2(p 2 p)2/2s2] [1] mays L.) seed during storage is necessary to predict seed deterioration. This investigation tested one key assumption of the Ellis and Roberts where y is the relative frequency of deaths occurring at viability equation, namely,(More)
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