Abstract
The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton ( Gossyplum hirsutum L., cv ‘Dunn 56C’). A relationship between plant water status and activity of each measured physiological parameter was established. Slight increases in leaf diffusive resistance were observed as leaf water potentials decreased although complete stomatal closure due to water stress was not generally observed. In many cases, visibly wilted leaves with zero turgor potentials exhibited minimal diffusive resistances. Morning and afternoon values of leaf diffusive resistance were distinctly different even though no correlation between leaf water potential and diffusive resistance was evident. Water stress substantially reduced photosynthesis in both vegetative and reproductive leaves of cotton. Photosynthetic rates of each leaf type responded differently to declining leaf water potentials. The data suggest that the photosynthetic reduction could not be attributed to stomatal closure. The activity of nitrate reductase was adversely affected by declining leaf water potentials. The nocturnal activity of nitrate reductase (respiratory linked) was also reduced by severe water stress. However, the reduction from maximum daily activity to minimum night time activity was similar in both stressed and non‐stressed plants. These data suggest that inhibition of nitrate reductase activity could be due to long term water stress effects rather than temporal changes in plant water status. The data presented indicate that stomata of field grown cotton are relatively insensitive to water stress, at least within the range of leaf water potentials observed in this study. Measurement of stomatal activity may not be a good criterion for assessing plant water status of cotton. The measurement of one or more physiological processes may prove a better index of plant water status as well as providing sensitive selection criteria for breeding more drought tolerant varieties.
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Claims 12
Claim · model-written summary
Leaf diffusive resistance increased slightly as leaf water potential decreased under water stress in cotton.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- water stresse0
- Outcome
- leaf diffusive resistancee0
- Direction
- Slight increasese0
- Setting
- field growne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Slight increases in leaf diffusive resistance were observed as leaf water potentials decreased although complete stomatal closure due to water stress was not generally observed”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
Water stress substantially reduced photosynthesis in vegetative and reproductive leaves of cotton.
- Taxon
- cottonGossypium hirsutume0
- Organ / stage
- vegetative and reproductive leavese0
- Treatment
- Water stresse0
- Outcome
- photosynthesise0
- Direction
- substantially reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress substantially reduced photosynthesis in both vegetative and reproductive leaves of cotton”
Claim · model-written summary
Photosynthetic rates of each leaf type responded differently to declining leaf water potential in cotton.
- Taxon
- cottonGossypium hirsutume1
- Organ / stage
- each leaf typee0
- Treatment
- declining leaf water potentialse0
- Outcome
- Photosynthetic ratese0
- Setting
- field growne1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic rates of each leaf type responded differently to declining leaf water potentials”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
The photosynthetic reduction in cotton could not be attributed to stomatal closure.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- photosynthetic reductione0
- Qualifier
- could not be attributed to stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The data suggest that the photosynthetic reduction could not be attributed to stomatal closure”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
Nitrate reductase activity in cotton was adversely affected by declining leaf water potentials.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- declining leaf water potentialse0
- Outcome
- activity of nitrate reductasee0
- Direction
- adversely affectede0
- Setting
- field growne1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of nitrate reductase was adversely affected by declining leaf water potentials”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
Nocturnal nitrate reductase activity in cotton was reduced by severe water stress.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- severe water stresse0
- Outcome
- nocturnal activity of nitrate reductasee0
- Direction
- reducede0
- Qualifier
- respiratory linkede0
- Setting
- field growne1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nocturnal activity of nitrate reductase (respiratory linked) was also reduced by severe water stress”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
The reduction from maximum daily to minimum night nitrate reductase activity was similar in stressed and non-stressed cotton.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- stressede0
- Outcome
- reduction from maximum daily activity to minimum night time activitye0
- Direction
- no_changeinferrede0
- Setting
- field growne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reduction from maximum daily activity to minimum night time activity was similar in both stressed and non”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
Morning and afternoon leaf diffusive resistance values in cotton were distinctly different.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- Morning and afternoon values of leaf diffusive resistancee0
- Qualifier
- distinctly differente0
- Setting
- field growne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Morning and afternoon values of leaf diffusive resistance were distinctly different”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
Leaf diffusive resistance was not correlated with leaf water potential in cotton.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- leaf water potentiale0
- Outcome
- correlation between leaf water potential and diffusive resistancee0
- Direction
- no correlatione0
- Setting
- field growne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no correlation between leaf water potential and diffusive resistance was evident”
e1“The effects of varying degrees of water stress on stomatal activity, photosynthesis, and nitrate reductase activity were examined in field grown cotton”
Claim · model-written summary
Stomata of field-grown cotton are relatively insensitive to water stress.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- water stresse0
- Outcome
- stomatae0
- Direction
- relatively insensitivee0
- Setting
- field growne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The data presented indicate that stomata of field grown cotton are relatively insensitive to water stress”
Claim · model-written summary
Measurement of stomatal activity may not be a good criterion for assessing plant water status of cotton.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- assessing plant water statuse0
- Qualifier
- may not be a good criterione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Measurement of stomatal activity may not be a good criterion for assessing plant water status of cotton”
Claim · model-written summary
Measurement of one or more physiological processes may prove a better index of plant water status in cotton and support selection for drought tolerance in breeding.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- index of plant water statuse0
- Qualifier
- may provee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The measurement of one or more physiological processes may prove a better index of plant water status as well as providing sensitive selection criteria for breeding more drought tolerant varieties”
e1“Measurement of stomatal activity may not be a good criterion for assessing plant water status of cotton”
The same questions in other papers
drought · physiology: enzyme activity · Gossypium hirsutum (cotton)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- negative
1 paper more in this group
See all 5 papers →drought · physiology: photosynthesis · Gossypium hirsutum (cotton)Positive and negative results
45 papers in the same direction as this paper · 7 in the opposite direction
- negative
- positive
- positive
49 papers more in this group
See all 53 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.