G. C. Gerloff

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Critical factors in the selection of appropriate screening procedures to detect different phenotypic responses to nutrient-deficiency stress are discussed. Various morphological, anatomical, and physiological plant factors responsible for adaptations to nutrient deficiency, particularly low-P stress, are reviewed. Also, the relative effectiveness of various(More)
Native plants of Wisconsin seem to show considerable selectivity in the absorption of mineral elements. This was indicated by an unusually high or low concentration of a specific element in a species in comparison with other species growing under generally similar conditions, and by the fact that a species might have an unusually high concentration of one(More)
In contrast with studies which have based essential element requirements of algae on nutrient solution concentrations, in this investigation the requirements of each of 6 species of green and blue-green algae for calcium, magnesium, and potossium were quantitatively evaluated in terms of critical cell concentrations of the 3 cations. A critical cell(More)
Two lines of tomato (Lycopersicon esculentum Mill.) representing extremes in utilization effciency of absorbed Ca were studied to detect internal differences in Ca transport and distribution and factors responsible for strain differences in susceptibility to low Ca-stress. Differences in efficiency of Ca use were expressed as CaER (mg of dry weight produced(More)
The growth of inbred backcross (IB) lines derived from the cross of the phosphorus (P)-efficient donor parent (PI 206002) and the recurrent parent (cultivar Sanilac) was measured in low-P nutrient solution culture and in a field nursery on a soil moderately deficient in P. Several IB lines that resembled ‘Sanilac’ in general morphology were identified as(More)
grown from seed pieces inoculated with the suspension diluted I :IOO and t :Iooo. However, this material has been stained and will be examined microscopically as time permits. In addition, tubers have been saved from each of these hills to plant next season for further observation. This study will be continued until adequate information is obtained on the(More)
The capacities of sixty-six strains of snapbeans to grow in potassium-deficient media were compared in nutrient culture experiments. Marked differences were observed, particularly in the severity of potassium-deficiency symptoms. From this initial screening, two of the most efficient strains and three of the most inefficient were selected for detailed(More)
Techniques developed to measure growth of tomatoes and beans under limiting amounts of either P, K or Ca in solution culture reveal differences among strains. Genetic analysis permits estimates of gene action for control of efficiency and the isolation of improved segregants. The genetic isolates have value in studying mechanisms contributing to uptake,(More)
Plants of five tomato strains were grown under low-K stress at three Na levels. These plants were harvested at three time intervals, and Na accumulation and distribution were measured in their tissues. Strain differences were observed for the ability to substitute Na for K under low-K stress. In two strains with high Na-substitution capacity, efficiency in(More)
Tomato strains were grown under low-K stress (71 μM K) over a wide range of external Na levels (from 0.014 to 27.8 mM Na) to measure strain response in Na substitution capacity in relation to Na concentration. Relative differences among strains for Na substitution capacity were similar at all Na levels except for the minus Na control treatment. Successive(More)
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