Abstract
UV-B enhanced solar radiation (UV-B E) equivalent to 20 % ozone depletion at Madurai (10 degrees N), was imposed on K+ sufficient (K-0.88, 0.88 mM K2SO4) and K+ deficient (K-0.05, 0.05 mM K2SO4) cowpea (Vigna unguiculata cv. Pusa-152) seedlings, and changes in growth, leaf photosynthetic pigments, soluble leaf protein contents and photosynthetic activities were analysed 12 d after start of the stress. Low K supply given either independently or in combination with UV-B E significantly reduced shoot and leaf biomass. The area of first trifoliate leaflets was greatly declined under combined stresses as compared to that of cotyledonary leaves, A negative correlation between growth and photosynthesis was found in K-0.88 seedlings grown under UV-B E. A wide variation between the primary and trifoliate leaves was observed in contents of soluble leaf proteins under stress. The electron transport activities and net CO2 uptake showed a sharp decline in seedlings subjected to combined stresses although the concentration of photosynthetic pigments remained unchanged. Hence the low K supply increased the UV-B susceptibility of cowpea seedlings in the field.
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Claims 8
Claim · model-written summary
Low potassium alone significantly reduced cowpea shoot and leaf biomass.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- Low K supplye0
- Outcome
- shoot and leaf biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low K supply given either independently or in combination with UV-B E significantly reduced shoot and leaf biomass.”
t0“cowpea seedlings”
Claim · model-written summary
Low potassium combined with enhanced UV-B significantly reduced shoot and leaf biomass.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- in combination with UV-B Ee0
- Outcome
- shoot and leaf biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low K supply given either independently or in combination with UV-B E significantly reduced shoot and leaf biomass.”
t0“cowpea seedlings”
Claim · model-written summary
Combined stresses greatly reduced first trifoliate leaflet area relative to cotyledonary leaves.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- combined stressese0
- Outcome
- area of first trifoliate leafletse0
- Direction
- declinede0
- Comparator
- cotyledonary leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The area of first trifoliate leaflets was greatly declined under combined stresses as compared to that of cotyledonary leaves”
t0“cowpea seedlings”
Claim · model-written summary
Growth and photosynthesis were negatively correlated in potassium sufficient seedlings under enhanced UV-B.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- K-0.88 seedlingse0
- Treatment
- UV-B Ee0
- Outcome
- growth and photosynthesise0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A negative correlation between growth and photosynthesis was found in K-0.88 seedlings grown under UV-B E.”
t0“cowpea seedlings”
Claim · model-written summary
Soluble leaf protein content varied widely between primary and trifoliate leaves under stress.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- primary and trifoliate leavese0
- Outcome
- contents of soluble leaf proteinse0
- Qualifier
- under stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A wide variation between the primary and trifoliate leaves was observed in contents of soluble leaf proteins under stress.”
t0“cowpea seedlings”
Claim · model-written summary
Combined stresses sharply reduced electron transport activities and net CO2 uptake.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- combined stressese0
- Outcome
- electron transport activities and net CO2 uptakee0
- Direction
- sharp declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The electron transport activities and net CO2 uptake showed a sharp decline in seedlings subjected to combined stresses although the concentration of photosynthetic pigments remained unchanged.”
t0“cowpea seedlings”
Claim · model-written summary
Photosynthetic pigment concentration remained unchanged under combined stresses.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- combined stressese0
- Outcome
- concentration of photosynthetic pigmentse0
- Direction
- unchangede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The electron transport activities and net CO2 uptake showed a sharp decline in seedlings subjected to combined stresses although the concentration of photosynthetic pigments remained unchanged.”
t0“cowpea seedlings”
Claim · model-written summary
Low potassium supply increased field susceptibility of cowpea seedlings to UV-B.
- Taxon
- cowpea seedlingsVigna unguiculatae0
- Treatment
- low K supplye0
- Outcome
- UV-B susceptibilitye0
- Direction
- increasede0
- Setting
- fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hence the low K supply increased the UV-B susceptibility of cowpea seedlings in the field.”
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This paper is about lacking the nutrient, so it counts the other way round here.
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See all 19 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.