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Effect of Fertilizer Nitrogen and Simazine on Amino Acids and Proteins in Brassicas

Authors:

F. I. Meredith

and

M. H. Gaskins

Abstract

Simazine [2-chloro-4,6-bis(ethylamino-s-triazine)] sprays (2 or 4 g·liter^-1) and supplemental N fertilizer (50 or 100 kg·ha^-1) were applied to 3 Brassica species. Both N and simazine treatments increased total N content of leaves, but much of the increased N was not in the protein fraction. Amino acids were not inceased by the N fertilizer in most cases and were reduced by the simazine treatments. The treatments were not useful as a method for improving nutritional quality.

Open Access

Type:: Journal Article

in HortScience

Published print:: 01 Dec 1984

Volume/Issue:: Volume 19: Issue 6

Article Category:: Research Article

Characteristics of Fruit from High- and Low-quality Peach Cultivars

Authors:

J. A. Robertson

F. I. Meredith

, and

Ralph Scorza

Abstract

The chemical composition and sensory acceptability of two low-quality (‘Bailey’ and ‘Boone County’) and two high-quality (‘Jefferson’ and Selection B612615) peach genotypes were compared. The high-quality fruit were firmer and much larger than low-quality fruit. The most striking difference between high- and low-quality peaches was that the low-quality fruit contained about seven times more total phenolics. Glucose and sorbitol were at higher levels in low-quality fruit, whereas fructose was higher in the high-quality genotypes. Sensory data substantiated the classification of the cultivars into high- and low-quality fruit. ‘Jefferson’ and B612615 peaches were rated between acceptable and good after ripening, whereas ‘Bailey’ and ‘Boone County’ were rated unacceptable. The flavor of the low-quality cultivars was described as bitter and astringent with a strong aftertaste. The high polyphenolic content, which has been associated with the astringent flavor of fresh peaches, may partially explain the poor flavor of the low-quality fruit.

Open Access

Type:: Journal Article

in HortScience

Published print:: 01 Dec 1988

Volume/Issue:: Volume 23: Issue 6

Article Category:: Research Article

Nitrogen Concentration and

{NH}_{4}^{+}

{NO}_{3}^{-}

Ratio Effects on Amino Acid Pattern and Protein Quality Seeds of Vigna unguiculata

Authors:

F. I. Meredith

H. A. Mills

, and

G. G. Dull

Abstract

The effect of N source ( ${NO}_{3}^{-}$ , ${NH}_{4}^{+}$ ) and N concentration on amino acid patterns was determined for seeds of Vigna unguiculata (L.) Walp. (southernpea, cowpea) cv. Pinkeye Purple Hull. The lowest amino acid content was obtained when ${NO}_{3}^{-}$ supplied all of the N. At 75 ppm N, amino acids and proteins in seeds were increased as the ratio of ${NH}_{4}^{+}$ to ${NO}_{3}^{-}$ was increased. N source, at 150 ppm N, had no effect on amino acid content. Increasing total N from 75 ppm to 150 ppm increased protein levels. Protein quality was unaffected by changing the ${NO}_{3}^{-}$ : ${NH}_{4}^{+}$ ratios or by doubling the N concentration. The limiting amino acid was methionine.