Abstract
Abstract Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution, under three levels of nitrogen (N) supply, in order to assess their effects on growth and yield, and to evaluate the N status by the following methods: visual symptoms, changes in the leaf ultrastructure, direct and indirect determinations of leaf chlorophyll (SPAD readings); NO3-N in the petiole both, by spot test in vivo and by quantitative determination; total N in the leaf blade and nitrate reductase activity (NO3 R) in the same; total N in the seeds. Low N level in the solution drastically reduced vegetative growth components, number of bolls and seed cotton and fiber yields. Nitrogen deficiency caused yellowing of the leaves beginning in the older ones. The main changes in the ultrastructure of the N deficient leaves were the disruption of the chloroplast membrane and the accumulation of starch granules and lipid globules. The semiquantitative assessment of nitrate in the petiole was unable to differentiate between the upper levels of nitrogen supply, this being also the case for seed N. Nitrogen status was well correlated both with the quantitative determination of NO3-N and with the NO3 R activity. Both direct and indirect determinations of leaf chlorophyll (SPAD readings) were able to reflect the N status, showing significant correlation with yield. Keywords: CottonNitrogenNutritional status
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Claims 8
Claim · model-written summary
Low N reduced vegetative growth components and number of bolls.
- Taxon
- Gossypium hirsutum
Gossypium hirsutume0 - Material
- cv. Antarese0
- Treatment
- Low N level in the solutione1
- Outcome
- vegetative growth components, number of bollse1
- Direction
- reducede1
- Setting
- nutrient solutione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e1“Low N level in the solution drastically reduced vegetative growth components, number of bolls and seed cotton and fiber yields”
Claim · model-written summary
Low N reduced seed cotton and fiber yields.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Material
- cv. Antarese0
- Treatment
- Low N level in the solutione1
- Outcome
- seed cotton and fiber yieldse1
- Direction
- reducede1
- Setting
- nutrient solutione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e1“Low N level in the solution drastically reduced vegetative growth components, number of bolls and seed cotton and fiber yields”
Claim · model-written summary
Nitrogen deficiency caused yellowing of the leaves, beginning in the older ones.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Material
- cv. Antarese0
- Organ / stage
- the leavese2
- Treatment
- Nitrogen deficiencye2
- Outcome
- yellowing of the leavese2
- Setting
- nutrient solutione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e2“Nitrogen deficiency caused yellowing of the leaves beginning in the older ones”
Claim · model-written summary
N deficient leaves showed changes in ultrastructure, with disrupted chloroplast membranes and accumulated starch granules and lipid globules.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Organ / stage
- leavese3
- Treatment
- N deficiente3
- Outcome
- changes in the ultrastructuree3
- Qualifier
- disruption of the chloroplast membrane and the accumulation of starch granules and lipid globulese3
- Setting
- nutrient solutione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e3“The main changes in the ultrastructure of the N deficient leaves were the disruption of the chloroplast membrane and the accumulation of starch granules and lipid globules”
Claim · model-written summary
Semiquantitative assessment of nitrate in the petiole could not differentiate between upper N levels, and seed N likewise.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Organ / stage
- petiolee4
- Outcome
- The semiquantitative assessment of nitrate in the petiolee4
- Qualifier
- this being also the case for seed Ne5
- Comparator
- upper levels of nitrogen supplye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e4“The semiquantitative assessment of nitrate in the petiole was unable to differentiate between the upper levels of nitrogen supply”
e5“this being also the case for seed N”
Claim · model-written summary
Nitrogen status was well correlated with the quantitative determination of NO3-N and with NO3 R activity.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Outcome
- Nitrogen statuse6
- Qualifier
- the quantitative determination of NO3-N and with the NO3 R activitye6
- Setting
- nutrient solutione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e6“Nitrogen status was well correlated both with the quantitative determination of NO3-N and with the NO3 R activity”
Claim · model-written summary
Direct and indirect determinations of leaf chlorophyll (SPAD readings) were able to reflect N status.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Organ / stage
- leafe7
- Outcome
- N statuse7
- Qualifier
- direct and indirect determinationse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e7“Both direct and indirect determinations of leaf chlorophyll (SPAD readings) were able to reflect the N status”
Claim · model-written summary
Leaf chlorophyll (SPAD readings) showed significant correlation with yield.
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Organ / stage
- leafe7
- Outcome
- yielde2
- Qualifier
- SPAD readingse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton plants, Gossypium hirsutum L. cv. Antares, were grown in nutrient solution”
e7“Both direct and indirect determinations of leaf chlorophyll (SPAD readings) were able to reflect the N status”
e2“showing significant correlation with yield”
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