Abstract
The increase in intensity and frequency of drought due to global climate change has increased the urgency of developing crop cultivars suitable for dry environments. Drought tolerance is a complex trait that involves numerous physiological, biochemical, and morphological responses. A better understanding of those mechanisms is critical to develop drought tolerant cultivars. In this study, we aimed to understand the morphophysiological changes at the shoot and root levels in response to drought stress of ten oat genotypes with diverse root morphological characteristics. Twenty-one-day old plants were subjected to drought stress in a greenhouse by withholding water for two weeks. Several characteristics including chlorophyll content, relative water content (RWC), stomatal conductance, stomata number, shoot dry weight (SDW), root dry weight (RDW), root-to-shoot biomass ratio (RSR), root length, root area, and root volume were measured on well-watered, and drought-stressed plants. Grain yield was evaluated by continuing the drought treatment with a drying and rewatering cycle every 15 days until physiological maturity. The water regime had a significant impact on all traits evaluated. A significant interaction between genotype and water treatment was observed for RWC, chlorophyll content, stomatal conductance, stomata number, and grain yield but not for root traits, suggesting that the root system of all genotypes responded similarly to drought stress. Hayden, the cultivar with the lowest reduction in grain yield from the drought treatment, was among the genotypes with the lowest reduction in RWC and chlorophyll content but with a sharp decrease in stomata number, thus indicating that regulating the plant water status and maintaining the photosynthesis level are important for oat plants to maintain grain yield under drought stress. The size of the root system was not correlated with grain yield under drought, but the RWC and grain yield were significantly correlated under drought, thus suggesting that maintaining the RWC is an important characteristic for oat plants to maintain yield under drought stress.
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Claims 9
Claim · model-written summary
Water regime significantly affected all evaluated oat traits.
- Taxon
- Oat
Avena sativat0 - Treatment
- water regimee0
- Outcome
- all traits evaluatede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The water regime had a significant impact on all traits evaluated.”
t0“Oat (Avena sativa L.)”
Claim · model-written summary
Genotype and water treatment interacted significantly for RWC, chlorophyll content, stomatal conductance, stomata number, and grain yield.
- Taxon
- OatAvena sativat0
- Treatment
- water treatmente0
- Outcome
- RWC, chlorophyll content, stomatal conductance, stomata number, and grain yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A significant interaction between genotype and water treatment was observed for RWC, chlorophyll content, stomatal conductance, stomata number, and grain yield but not for root traits”
t0“Oat (Avena sativa L.)”
Claim · model-written summary
Root traits showed no significant genotype by water treatment interaction.
- Taxon
- OatAvena sativat0
- Treatment
- drought stresse0
- Outcome
- root traitse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not for root traits, suggesting that the root system of all genotypes responded similarly to drought stress”
t0“Oat (Avena sativa L.)”
Claim · model-written summary
Hayden had the lowest reduction in grain yield under drought.
- Taxon
- OatAvena sativat0
- Material
- Haydene0
- Treatment
- drought treatmente0
- Outcome
- grain yielde0
- Direction
- lowest reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hayden, the cultivar with the lowest reduction in grain yield from the drought treatment”
t0“Oat (Avena sativa L.)”
Claim · model-written summary
Hayden was among genotypes with the lowest RWC reduction.
- Taxon
- OatAvena sativat0
- Material
- Haydene0
- Treatment
- drought treatmente0
- Outcome
- RWCe0
- Direction
- lowest reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hayden, the cultivar with the lowest reduction in grain yield from the drought treatment, was among the genotypes with the lowest reduction in RWC and chlorophyll content”
t0“Oat (Avena sativa L.)”
Claim · model-written summary
Hayden was among genotypes with the lowest chlorophyll content reduction.
- Taxon
- OatAvena sativat0
- Material
- Haydene0
- Treatment
- drought treatmente0
- Outcome
- chlorophyll contente0
- Direction
- lowest reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hayden, the cultivar with the lowest reduction in grain yield from the drought treatment, was among the genotypes with the lowest reduction in RWC and chlorophyll content”
t0“Oat (Avena sativa L.)”
Claim · model-written summary
Hayden showed a sharp decrease in stomata number.
- Taxon
- OatAvena sativat0
- Material
- Haydene1
- Treatment
- drought treatmente1
- Outcome
- stomata numbere0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but with a sharp decrease in stomata number”
t0“Oat (Avena sativa L.)”
e1“Hayden, the cultivar with the lowest reduction in grain yield from the drought treatment”
Claim · model-written summary
Root system size was not correlated with grain yield under drought.
- Taxon
- OatAvena sativat0
- Organ / stage
- root systeme0
- Outcome
- grain yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The size of the root system was not correlated with grain yield under drought”
t0“Oat (Avena sativa L.)”
Claim · model-written summary
RWC and grain yield were significantly correlated under drought.
- Taxon
- OatAvena sativat0
- Treatment
- droughte0
- Outcome
- RWC and grain yielde0
- Qualifier
- under droughte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the RWC and grain yield were significantly correlated under drought”
t0“Oat (Avena sativa L.)”
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