Abstract
Abstract The protein of kidney beans ( Phaseolus vulgaris L.), an important food crop, is poor in S‐containing amino acids and needs improvement. Solution and sand‐culture studies have shown that S fertilization increases the concentration of S‐containing amino acids in several crops. K application affects protein composition of some crops. The objective of this research was, therefore, to determine the amino‐acid concentrations of ‘Naze’ kidney beans and to study the effects of soil‐SO 4 2‐ levels and K 2 SO 4 application on grain yield and amino‐acid composition, especially the concentration of methionine. An area of Xerollic Calciorthid, fine, vermiculitic, chermic soil which had been used previously for a S‐fertility study with wheat ( Triticum aestivum L. em. Thell.) was used for this trial at Pahlavi University, Shiraz, Iran. The design of the experiment was a split plot with K 2 SO 4 , levels as main‐plot treatments and the prior S levels constituting the split‐plot treatments. (NH 4 ) 2 HPO 4 was applied uniformly at 200 kg/ha. Kidney beans were seeded at the rate of 75 kg/ha. Proximate protein analyses were made by determining total N content and multiplying by a factor of 6.25. Tryptophan was analyzed colorimetrically and the other amino acids were determined in a Beckman Spinco amino‐acid analyzer. Chemical scores reflecting protein quality were calculated by FAO instructions. Neither K 2 SO 4 fertilization nor the prior S treatments had any effect on yield of dry matter or grain, ratio of grain to total dry matter, or grain‐protein concentration. Methionine concentration was positively correlated with soil‐SO 4 2‐ level (r = 0.75; significant at the 1% level.). The first limiting amino acid was methionine, followed by valine and/or isoleucine. Tryptophan was not limiting. Regression equations for predicting methionine from soil‐SO 4 2‐ levels and valine and tryptophan from total‐protein concentrations are presented. Sulfur application may increase the methionine concentration of bean protein, but the large amounts of S required and the high costs involved appear to limit the usefulness of this approach for improving protein quality.
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Claims 7
Claim · model-written summary
K2SO4 fertilization had no effect on dry matter or grain yield, grain to dry matter ratio, or grain protein concentration of kidney beans.
- Taxon
- Kidney Beans
Phaseolus vulgarist0 - Treatment
- K 2 SO 4 fertilizatione0
- Outcome
- yield of dry matter or grain, ratio of grain to total dry matter, or grain‐protein concentratione0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kidney Beans”
e0“Neither K 2 SO 4 fertilization nor the prior S treatments had any effect on yield of dry matter or grain, ratio of grain to total dry matter, or grain‐protein concentration”
Claim · model-written summary
The prior S treatments had no effect on dry matter or grain yield, grain to dry matter ratio, or grain protein concentration of kidney beans.
- Taxon
- Kidney BeansPhaseolus vulgarist0
- Treatment
- the prior S treatmentse0
- Outcome
- yield of dry matter or grain, ratio of grain to total dry matter, or grain‐protein concentratione0
- Direction
- no_changeinferrede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kidney Beans”
e0“Neither K 2 SO 4 fertilization nor the prior S treatments had any effect on yield of dry matter or grain, ratio of grain to total dry matter, or grain‐protein concentration”
Claim · model-written summary
Methionine concentration in kidney beans was positively correlated with soil sulfate level (r = 0.75, significant at the 1% level).
- Taxon
- Kidney BeansPhaseolus vulgarist0
- Treatment
- soil‐SO 4 2‐ levele0
- Outcome
- Methionine concentratione0
- Direction
- positivelye0
- Value
- r = 0.75e0
- Qualifier
- significant at the 1% levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kidney Beans”
e0“Methionine concentration was positively correlated with soil‐SO 4 2‐ level (r = 0.75; significant at the 1% level”
Claim · model-written summary
Methionine was the first limiting amino acid in kidney beans, followed by valine and/or isoleucine.
- Taxon
- Kidney BeansPhaseolus vulgarist0
- Outcome
- first limiting amino acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kidney Beans”
e0“The first limiting amino acid was methionine, followed by valine and/or isoleucine”
Claim · model-written summary
Tryptophan was not a limiting amino acid in kidney beans.
- Taxon
- Kidney BeansPhaseolus vulgarist0
- Outcome
- Tryptophan was not limitinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kidney Beans”
e0“Tryptophan was not limiting”
Claim · model-written summary
Sulfur application may increase the methionine concentration of bean protein.
- Taxon
- beane0
- Treatment
- Sulfur applicatione0
- Outcome
- methionine concentration of bean proteine0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“Sulfur application may increase the methionine concentration of bean protein”
Claim · model-written summary
The large amounts of S required and the high costs appear to limit the usefulness of S application for improving bean protein quality.
- Taxon
- Kidney BeansPhaseolus vulgarist0
- Outcome
- usefulness of this approach for improving protein qualitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Kidney Beans”
e0“the large amounts of S required and the high costs involved appear to limit the usefulness of this approach for improving protein quality”
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sulfur atom · quality: protein · Phaseolus vulgaris (common bean)Results agree
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- positive
fertilization · quality: protein · Phaseolus vulgaris (common bean)Positive and negative results
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- positive
- positive
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See all 30 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.