Abstract
The effects of drought stress and high irradiance and their combination were studied under laboratory conditions using young plants of a very drought-resistant variety, ICMH 451, of pearl millet (Pennisetum glaucum) and three varieties of sorghum (Sorghum bicolor)-one drought-resistant from India, one drought-tolerant from Texas, and one drought-sensitive variety from France. CO(2) assimilation rates and photosystem II fluorescence in leaves were analyzed in parallel with photosynthetic electron transport, photosystem II fluorescence, and chlorophyll-protein composition in chloroplasts isolated from these leaves. High irradiance slightly increased CO(2) assimilation rates and electron transport activities of irrigated plants but not fluorescence. Drought stress (less than -1 megapascal) decreased CO(2) assimilation rates, fluorescence, and electron transport. Under the combined effects of drought stress and high irradiance, CO(2) assimilation rates and fluorescence were severely inhibited in leaves, as were the photosynthetic electron transport activities and fluorescence in chloroplasts (but not photosystem I activity). The synergistic or distinctive effect of drought and high irradiance is discussed. The experiments with pearl millet and three varieties of sorghum showed that different responses of plants to drought and light stresses can be monitored by plant physiological and biochemical techniques. Some of these techniques may have a potential for selection of stress-resistant varieties using seedlings.
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Claims 6
Claim · model-written summary
High irradiance slightly increased carbon assimilation and electron transport in irrigated plants.
- Taxon
- Sorghum and Pearl Millet
Cenchrus americanus
Sorghumt0 - Treatment
- High irradiancee0
- Outcome
- CO(2) assimilation rates and electron transport activitiese0
- Direction
- slightly increasede0
- Qualifier
- irrigated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High irradiance slightly increased CO(2) assimilation rates and electron transport activities of irrigated plants but not fluorescence”
t0“Sorghum and Pearl Millet”
Claim · model-written summary
High irradiance did not increase fluorescence in irrigated plants.
- Taxon
- Sorghum and Pearl MilletCenchrus americanusSorghumt0
- Treatment
- High irradiancee0
- Outcome
- fluorescencee0
- Direction
- note0
- Qualifier
- irrigated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High irradiance slightly increased CO(2) assimilation rates and electron transport activities of irrigated plants but not fluorescence”
t0“Sorghum and Pearl Millet”
Claim · model-written summary
Drought reduced carbon assimilation, fluorescence, and electron transport.
- Taxon
- Sorghum and Pearl MilletCenchrus americanusSorghumt0
- Treatment
- Drought stress (less than -1 megapascal)e0
- Outcome
- CO(2) assimilation rates, fluorescence, and electron transporte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress (less than -1 megapascal) decreased CO(2) assimilation rates, fluorescence, and electron transport”
t0“Sorghum and Pearl Millet”
Claim · model-written summary
Combined drought and high irradiance severely inhibited assimilation and fluorescence in leaves.
- Taxon
- Sorghum and Pearl MilletCenchrus americanusSorghumt0
- Organ / stage
- leavese0
- Treatment
- combined effects of drought stress and high irradiancee0
- Outcome
- CO(2) assimilation rates and fluorescencee0
- Direction
- severely inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the combined effects of drought stress and high irradiance, CO(2) assimilation rates and fluorescence were severely inhibited in leaves”
t0“Sorghum and Pearl Millet”
Claim · model-written summary
Combined drought and high irradiance inhibited chloroplast electron transport and fluorescence but not photosystem I activity.
- Taxon
- Sorghum and Pearl MilletCenchrus americanusSorghumt0
- Organ / stage
- chloroplastse0
- Treatment
- combined effects of drought stress and high irradiancee0
- Outcome
- photosynthetic electron transport activities and fluorescencee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the combined effects of drought stress and high irradiance, CO(2) assimilation rates and fluorescence were severely inhibited in leaves, as were the photosynthetic electron transport activities and fluorescence in chloroplasts (but not photosystem I activity)”
t0“Sorghum and Pearl Millet”
Claim · model-written summary
Seedling physiological and biochemical techniques distinguished drought and light responses among pearl millet and three sorghum varieties.
- Taxon
- Sorghum and Pearl MilletCenchrus americanusSorghumt0
- Outcome
- different responses of plants to drought and light stressese0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different responses of plants to drought and light stresses can be monitored by plant physiological and biochemical techniques”
t0“Sorghum and Pearl Millet”
The same questions in other papers
drought · physiology: photosynthesis · Cenchrus americanus (pearl millet)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
light · physiology: photosynthesis · SorghumPositive and negative results
5 in the opposite direction
- negative
- no effect
- negative
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See all 6 papers →drought · physiology: photosynthesis · SorghumPositive and negative results
21 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
19 papers more in this group
See all 23 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.