Abstract
Roots secrete a vast array of low molecular weight compounds into the soil broadly referred to as root exudates. It is a key mechanism by which plants and soil microbes interact in the rhizosphere. The effect of drought stress on the exudation process and composition is rarely studied, especially in cereal crops. This study focuses on comparative metabolic profiling of the exudates from sensitive and tolerant genotypes of pearl millet after a period of drought stress. We employed a combined platform of gas and liquid chromatography coupled to mass spectrometry to cover both primary and secondary metabolites. The results obtained demonstrate that both genotype and drought stress have a significant impact on the concentration and composition of root exudates. The complexity and function of these differential root exudates are discussed. To reveal the potential effect of root exudates on the soil microbial community after a period of drought stress, we also tested for biological nitrification inhibition (BNI) activity. The analysis revealed a genotype-dependent enhancement of BNI activity after a defined period of drought stress. In parallel, we observed a genotype-specific relation of elongated root growth and root exudation under drought stress. These data suggest that the drought stress-dependent change in root exudation can manipulate the microbial soil communities to adapt and survive under harsh conditions. Supplementary Information: The online version contains supplementary material available at 10.1007/s00374-021-01578-w.
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Claims 5
Claim · model-written summary
Genotype significantly affected root exudate concentration and composition.
- Taxon
- pearl millet
Cenchrus americanust0 - Material
- genotypee0
- Outcome
- concentration and composition of root exudatese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results obtained demonstrate that both genotype and drought stress have a significant impact on the concentration and composition of root exudates.”
t0“pearl millet”
Claim · model-written summary
Drought stress significantly affected root exudate concentration and composition.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- drought stresse0
- Outcome
- concentration and composition of root exudatese0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results obtained demonstrate that both genotype and drought stress have a significant impact on the concentration and composition of root exudates.”
t0“pearl millet”
Claim · model-written summary
Drought stress enhanced biological nitrification inhibition activity in a genotype-dependent way.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- drought stresse0
- Outcome
- BNI activitye0
- Direction
- enhancemente0
- Qualifier
- genotype-dependente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The analysis revealed a genotype-dependent enhancement of BNI activity after a defined period of drought stress.”
t0“pearl millet”
Claim · model-written summary
Under drought, elongated root growth related to root exudation in a genotype-specific way.
- Taxon
- pearl milletCenchrus americanust0
- Material
- genotype-specifice0
- Treatment
- drought stresse0
- Outcome
- elongated root growth and root exudatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In parallel, we observed a genotype-specific relation of elongated root growth and root exudation under drought stress.”
t0“pearl millet”
Claim · model-written summary
Authors suggest drought-driven root exudation changes may alter soil microbial communities.
- Taxon
- pearl milletCenchrus americanust0
- Treatment
- drought stress-dependent change in root exudatione0
- Outcome
- microbial soil communitiese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These data suggest that the drought stress-dependent change in root exudation can manipulate the microbial soil communities to adapt and survive under harsh conditions.”
t0“pearl millet”
The same questions in other papers
drought · disease · Cenchrus americanus (pearl millet)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
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.