Abstract
In crops like wheat, terminal drought is one of the principal stress factors limiting productivity in rain-fed systems. However, little is known about root development after heading, when water uptake can be critical to wheat crops. The impact of water-stress on root growth was investigated in two wheat cultivars, Scout and Mace, under well-watered and post-anthesis water stress in three experiments. Plants were grown outside in 1.5-m long pots at a density similar to local recommended farming practice. Differences in root development were observed between genotypes, especially for water stress conditions under which Scout developed and maintained a larger root system than Mace. While under well-watered conditions both genotypes had shallow roots that appeared to senesce after heading, a moderate water stress stimulated shallow-root growth in Scout but accelerated senescence in Mace. For deep roots, post-heading biomass growth was observed for both genotypes in well-watered conditions, while under moderate water stress, only Scout maintained net growth as Mace deep roots senesced. Water stress of severe intensity affected both genotypes similarly, with root senescence at all depths. Senescence was also observed above ground. Under well-watered conditions, Scout retained leaf greenness (i.e. stay-green phenotype) for slightly longer than Mace. The difference between genotypes accentuated under moderate water stress, with rapid post-anthesis leaf senescence in Mace while Scout leaf greenness was affected little if at all by the stress. As an overall result, grain biomass per plant ('yield') was similar in the two genotypes under well-watered conditions, but more affected by a moderate stress in Mace than Scout. The findings from this study will assist improvement in modelling root systems of crop models, development of relevant phenotyping methods and selection of cultivars with better adaptation to drought.
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Claims 13
Claim · model-written summary
Under water stress, Scout developed and maintained a larger root system than Mace.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under which Scout developed and maintained a larger root system than Mace”
t0“wheat”
Claim · model-written summary
Under well-watered conditions both cultivars had shallow roots that appeared to senesce after heading.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- shallow roots that appeared to senesce after headinge0
- Qualifier
- well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under well-watered conditions both genotypes had shallow roots that appeared to senesce after heading”
t0“wheat”
Claim · model-written summary
Moderate water stress stimulated shallow-root growth in Scout.
- Taxon
- wheatTriticum aestivumt0
- Material
- Scoute0
- Treatment
- moderate water stresse0
- Outcome
- shallow-root growthe0
- Direction
- stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a moderate water stress stimulated shallow-root growth in Scout”
t0“wheat”
Claim · model-written summary
Moderate water stress accelerated shallow-root senescence in Mace.
- Taxon
- wheatTriticum aestivumt0
- Material
- Macee0
- Treatment
- moderate water stresse0
- Outcome
- senescencee0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a moderate water stress stimulated shallow-root growth in Scout but accelerated senescence in Mace”
t0“wheat”
Claim · model-written summary
Deep-root biomass grew after heading in both cultivars when well watered.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- post-heading biomass growthe0
- Qualifier
- well-watered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“post-heading biomass growth was observed for both genotypes in well-watered conditions”
t0“wheat”
Claim · model-written summary
Under moderate water stress, Scout maintained net deep-root growth.
- Taxon
- wheatTriticum aestivumt0
- Material
- Scoute0
- Outcome
- net growthe0
- Qualifier
- moderate water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under moderate water stress, only Scout maintained net growth”
t0“wheat”
Claim · model-written summary
Under moderate water stress, Mace deep roots senesced.
- Taxon
- wheatTriticum aestivumt0
- Material
- Macee0
- Outcome
- deep roots senescede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mace deep roots senesced”
t0“wheat”
Claim · model-written summary
Severe water stress caused root senescence at all depths in both cultivars.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Water stress of severe intensitye0
- Outcome
- root senescence at all depthse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress of severe intensity affected both genotypes similarly, with root senescence at all depths.”
t0“wheat”
Claim · model-written summary
Scout retained leaf greenness slightly longer than Mace when well watered.
- Taxon
- wheatTriticum aestivumt0
- Material
- Scoute0
- Outcome
- leaf greennesse0
- Direction
- slightly longere0
- Comparator
- Macee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under well-watered conditions, Scout retained leaf greenness (i.e. stay-green phenotype) for slightly longer than Mace.”
t0“wheat”
Claim · model-written summary
Moderate water stress caused rapid post-anthesis leaf senescence in Mace.
- Taxon
- wheatTriticum aestivumt0
- Material
- Macee0
- Outcome
- rapid post-anthesis leaf senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rapid post-anthesis leaf senescence in Mace”
t0“wheat”
Claim · model-written summary
Moderate stress affected Scout leaf greenness little if at all.
- Taxon
- wheatTriticum aestivumt0
- Material
- Scoute0
- Treatment
- moderate water stresse1
- Outcome
- leaf greennesse0
- Direction
- affected little if at alle0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scout leaf greenness was affected little if at all by the stress”
e1“The difference between genotypes accentuated under moderate water stress, with rapid post-anthesis leaf senescence in Mace while Scout leaf greenness was affected little if at all by the stress.”
t0“wheat”
Claim · model-written summary
Grain biomass per plant was similar between cultivars when well watered.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- grain biomass per plante0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain biomass per plant ('yield') was similar in the two genotypes under well-watered conditions”
t0“wheat”
Claim · model-written summary
Moderate stress affected Mace grain biomass more than Scout grain biomass.
- Taxon
- wheatTriticum aestivumt0
- Material
- Macee0
- Outcome
- grain biomass per plante1
- Direction
- more affectede0
- Comparator
- Scoute0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more affected by a moderate stress in Mace than Scout”
e1“grain biomass per plant ('yield') was similar in the two genotypes under well-watered conditions, but more affected by a moderate stress in Mace than Scout.”
t0“wheat”
The same questions in other papers
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