Abstract
Abstract Chlorophyll stability during drought might be a promising criterion for selection for drought resistance in peanut. The study describes two field trials conducted at Khon Kaen University, Thailand which investigate genotype × drought interactions in a wide range of peanut germplasm in general and assess the relationship between chlorophyll stability and genotypic performance in particular, under drought. Two field experiments (during 2003/2004 and 2004/2005 dry seasons) were conducted in a split plot design with three water regimes [field capacity, 2/3 available water (AW) and 1/3 AW] as main, and 12 peanut genotypes as subtreatments, replicated four times. Observations on total dry matter (TDM), chlorophyll density (ChlD) (chlorophyll content per unit leaf area), chlorophyll content (chlorophyll content per plant) and SPAD chlorophyll meter readings (SCMR) were recorded at 30, 60 and 90 days after emergence. Transpiration (T) and transpiration efficiency (TE) were computed using the data on amount of water input and TDM. Drought stress significantly reduced TDM, T and chlorophyll content across genotypes but significantly increased TE and ChlD in peanut. However, there were significant differences among genotypes for TE and chlorophyll parameters. The genotype × drought interaction effects for chlorophyll characters (content and density) were not significant suggesting a strong genetic effect. The correlation coefficients between TDM and chlorophyll content (r = 0.51, P = 0.01 to r = 0.91, P = 0.01) and between TE and ChlD (r = 0.46, P = 0.05 to r = 0.77, P = 0.01) were positive and significant. These findings suggest that chlorophyll parameters are strongly linked with drought tolerance in peanut. There were highly significant and positive relationships between ChlD and SCMR (r = 0.67, P = 0.01 to r = 0.93, P = 0.01), between SCMR and TE (r = 0.41, P = 0.05 to r = 0.80, P = 0.01) suggesting that SCMR could be used as a tool for rapid assessment of relative chlorophyll status in peanut genotypes as well as for the indirect selection of drought tolerance in peanut.
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Claims 14
Claim · model-written summary
Drought significantly reduced total dry matter in peanut.
- Taxon
- Peanut
Arachis hypogaeat0 - Treatment
- Drought stresse0
- Outcome
- TDMe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced TDM, T and chlorophyll content across genotypes”
t0“Peanut”
Claim · model-written summary
Drought significantly reduced transpiration in peanut.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- Drought stresse0
- Outcome
- Transpiration (T)e1
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced TDM, T and chlorophyll content across genotypes”
e1“Transpiration (T)”
t0“Peanut”
Claim · model-written summary
Drought significantly reduced chlorophyll content in peanut.
- Taxon
- PeanutArachis hypogaeat0
- Treatment
- Drought stresse0
- Outcome
- chlorophyll contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced TDM, T and chlorophyll content across genotypes”
t0“Peanut”
Claim · model-written summary
Drought significantly increased transpiration efficiency in peanut.
- Taxon
- peanutArachis hypogaeae0
- Treatment
- Drought stresse0
- Outcome
- transpiration efficiency (TE)e1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced TDM, T and chlorophyll content across genotypes but significantly increased TE and ChlD in peanut”
e1“transpiration efficiency (TE)”
Claim · model-written summary
Drought significantly increased chlorophyll density in peanut.
- Taxon
- peanutArachis hypogaeae0
- Treatment
- Drought stresse0
- Outcome
- chlorophyll density (ChlD)e1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced TDM, T and chlorophyll content across genotypes but significantly increased TE and ChlD in peanut”
e1“chlorophyll density (ChlD)”
Claim · model-written summary
Peanut genotypes differed significantly in transpiration efficiency and chlorophyll parameters.
- Taxon
- peanutArachis hypogaeat0
- Material
- genotypese0
- Outcome
- TE and chlorophyll parameterse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were significant differences among genotypes for TE and chlorophyll parameters”
t0“peanut”
Claim · model-written summary
Genotype by drought interactions for chlorophyll content and density were not significant.
- Taxon
- peanutArachis hypogaeat0
- Material
- genotypee0
- Treatment
- droughte0
- Outcome
- chlorophyll characters (content and density)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The genotype × drought interaction effects for chlorophyll characters (content and density) were not significant”
t0“peanut”
Claim · model-written summary
Total dry matter and chlorophyll content correlated positively and significantly, with r values from 0.51 to 0.91.
- Taxon
- peanutArachis hypogaeat0
- Compound
- chlorophylle0
- Outcome
- TDMe0
- Direction
- positivee0
- Value
- r = 0.51, P = 0.01 to r = 0.91, P = 0.01e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The correlation coefficients between TDM and chlorophyll content (r = 0.51, P = 0.01 to r = 0.91, P = 0.01) and between TE and ChlD (r = 0.46, P = 0.05 to r = 0.77, P = 0.01) were positive and significant”
t0“peanut”
Claim · model-written summary
Transpiration efficiency and chlorophyll density correlated positively and significantly, with r values from 0.46 to 0.77.
- Taxon
- peanutArachis hypogaeat0
- Compound
- chlorophyll density (ChlD)e1
- Outcome
- TEe0
- Direction
- positivee0
- Value
- r = 0.46, P = 0.05 to r = 0.77, P = 0.01e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“between TE and ChlD (r = 0.46, P = 0.05 to r = 0.77, P = 0.01) were positive and significant”
e1“chlorophyll density (ChlD)”
t0“peanut”
Claim · model-written summary
Chlorophyll density and SPAD readings were positively and significantly related, with r values from 0.67 to 0.93.
- Taxon
- peanutArachis hypogaeat0
- Compound
- ChlDe0
- Outcome
- SCMRe0
- Direction
- positivee0
- Value
- r = 0.67, P = 0.01 to r = 0.93, P = 0.01e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“positive relationships between ChlD and SCMR (r = 0.67, P = 0.01 to r = 0.93, P = 0.01)”
t0“peanut”
Claim · model-written summary
SPAD readings and transpiration efficiency were positively and significantly related, with r values from 0.41 to 0.80.
- Taxon
- peanutArachis hypogaeat0
- Outcome
- TEe0
- Direction
- positivee1
- Value
- r = 0.41, P = 0.05 to r = 0.80, P = 0.01e0
- Comparator
- SCMRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“between SCMR and TE (r = 0.41, P = 0.05 to r = 0.80, P = 0.01)”
e1“highly significant and positive relationships”
t0“peanut”
Claim · model-written summary
The authors suggest chlorophyll parameters are linked with drought tolerance in peanut.
- Taxon
- peanutArachis hypogaeae0
- Compound
- chlorophylle0
- Outcome
- drought tolerancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll parameters are strongly linked with drought tolerance in peanut”
Claim · model-written summary
The authors suggest SPAD readings can rapidly assess relative chlorophyll status in peanut genotypes.
- Taxon
- peanutArachis hypogaeae0
- Outcome
- relative chlorophyll statuse0
- Qualifier
- SCMRe0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SCMR could be used as a tool for rapid assessment of relative chlorophyll status in peanut genotypes”
Claim · model-written summary
The authors suggest SPAD readings can support indirect selection for drought tolerance in peanut.
- Taxon
- peanutArachis hypogaeae0
- Outcome
- indirect selection of drought tolerancee0
- Qualifier
- SCMRe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SCMR could be used as a tool for rapid assessment of relative chlorophyll status in peanut genotypes as well as for the indirect selection of drought tolerance in peanut”
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See all 9 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.