Abstract
Abstract Although an insufficient supply of water is commonly associated with reduced crop yields, the manner in which water deficits affect the functioning of many common field crops is not well established. The purpose of this study was to quantify the effects of a water deficit on some physiological processes of spring oats ( Avena sativa L. ‘Jaycee’). The plants were subjected to water deficits under a field environment for 9 to 11 days at the boot stage, at anthesis through early grain formation stage, and at both stages in combination. Relative leaf water content (RLWC) as determined by the relative turgidity method was used as a measure of water deficit. Leaf diffusion resistance (LDR) was monitored using a diffusion porometer. The net photosynthetic rate (NPR) of the oat plants was determined using an infrared gas analyzer. Severe water stress at all stages of development studied caused about an 80% decline in NPR. LDR increased with a decrease in RLWC. Stress during boot stage reduced the photosynthetic sensivity of the plants to subsequent stress at the anthesis through early grain formation stage. On rewatering, LDR and RLWC recovered completely within 1 to 6 days; however, the net photosynthetic rate of plants stressed at the anthesis through grain formation stage showed a more gradual and incomplete recovery than plants stressed at other stages. The plants stressed during boot stage alone, but adequately watered thereafter, exhibited significantly higher NPR than the control plants. The results indicate that leaf diffusion resistance and net photosynthetic rate of oats show acute sensitivity to plant water deficits. Hence, these parameters hold promise as aids in determining permissible water deficit limits and in irrigation scheduling.
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Claims 7
Claim · model-written summary
Severe water stress caused about an 80% decline in oat net photosynthetic rate at all studied stages.
- Taxon
- spring oats
Avena sativae0 - Material
- Jayceee0
- Treatment
- Severe water stresse1
- Outcome
- NPRe1
- Direction
- declinee1
- Value
- 80%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spring oats ( Avena sativa L. ‘Jaycee’)”
e1“Severe water stress at all stages of development studied caused about an 80% decline in NPR”
Claim · model-written summary
Leaf diffusion resistance increased as relative leaf water content decreased.
- Taxon
- oatAvena sativae0
- Organ / stage
- Leafe2
- Outcome
- LDRe1
- Direction
- increasede1
- Qualifier
- decrease in RLWCe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants”
e1“LDR increased with a decrease in RLWC”
e2“Leaf diffusion resistance (LDR)”
Claim · model-written summary
Boot-stage stress reduced photosynthetic sensitivity to later anthesis-to-grain-formation stress.
- Taxon
- spring oatsAvena sativae0
- Treatment
- Stress during boot stagee1
- Outcome
- photosynthetic sensivitye1
- Direction
- reducede1
- Qualifier
- subsequent stress at the anthesis through early grain formation stagee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spring oats”
e1“Stress during boot stage reduced the photosynthetic sensivity of the plants to subsequent stress at the anthesis through early grain formation stage”
Claim · model-written summary
Leaf diffusion resistance and relative leaf water content recovered completely within 1 to 6 days after rewatering.
- Taxon
- oatAvena sativae0
- Treatment
- rewateringe1
- Outcome
- LDR and RLWCe1
- Direction
- recovered completelye1
- Value
- 1 to 6 dayse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants”
e1“On rewatering, LDR and RLWC recovered completely within 1 to 6 days”
Claim · model-written summary
Photosynthetic recovery after anthesis-to-grain-formation stress was slower and incomplete relative to other stress stages.
- Taxon
- oatAvena sativae0
- Treatment
- stressed at the anthesis through grain formation stagee1
- Outcome
- net photosynthetic ratee1
- Direction
- more gradual and incomplete recoverye1
- Comparator
- plants stressed at other stagese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants”
e1“the net photosynthetic rate of plants stressed at the anthesis through grain formation stage showed a more gradual and incomplete recovery than plants stressed at other stages”
Claim · model-written summary
Plants stressed only at boot stage had significantly higher photosynthetic rate than controls after adequate watering.
- Taxon
- oatAvena sativae0
- Treatment
- stressed during boot stage alonee1
- Outcome
- NPRe1
- Direction
- highere1
- Qualifier
- adequately watered thereaftere1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oat plants”
e1“The plants stressed during boot stage alone, but adequately watered thereafter, exhibited significantly higher NPR than the control plants”
Claim · model-written summary
The authors proposed leaf diffusion resistance and net photosynthetic rate as aids for water deficit limits and irrigation scheduling.
- Taxon
- oatsAvena sativae2
- Outcome
- aids in determining permissible water deficit limits and in irrigation schedulinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf diffusion resistance and net photosynthetic rate of oats”
e1“these parameters hold promise as aids in determining permissible water deficit limits and in irrigation scheduling”
e2“leaf diffusion resistance and net photosynthetic rate of oats”
The same questions in other papers
drought · physiology: photosynthesis · Avena sativa (oats)Positive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
3 papers more in this group
See all 7 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.