Abstract
High temperatures may cause scorching of the twigs and leaves along with visual symptoms of sunburn, leaf senescence, growth inhibition, and ultimately decreased plant growth and biomass. Sunflower (Helianthus annuus L.) is one of the important oil seed crops and it potentially fits in agricultural system and oil production sector of Pakistan. Hence, it is important to get the best variety which may able to tolerate high temperatures in hot and humid environments. For this purpose, we have conducted the present study using ten different cultivars of (Hysin-33, T-40, H-OI, Hysin-39, Suncross, Gulshin, FH-825, FH-797, FH-784, AGSUN-5270) of H. annuus grown in the growth chambers in two different temperatures, i.e. control (25 °C) and heat stress (45 °C). A pot experiment was conducted and contains nutritional sand medium in the controlled environment in the growth chamber for 4 weeks. Results from the present study showed that heat stress induced a significant (p < 0.05) decrease in shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weight, chlorophyll a, chlorophyll b, total chlorophyll, and carotenoid content while increasing the production of reactive oxygen species (ROS) by increasing the concentration of malondialdehyde (MDA) and hydrogen peroxide (H2O2), which is manifested by increasing content of flavonoid and phenolic. Results also showed that Hysin-39, FH-825, and Hysin-33 showed better growth and development in heat-stressed environment and considered a heat-tolerant cultivar while Gulshin, Suncross, and AGSUN-5270 showed poor growth and development in the same stressed environment and were considered heat-sensitive cultivars. The overall trend of H. annuus cultivars grown under heat stress is as follows: Hysin-39 > FH-825 > Hysin-33 > T-40 > H-OI > FH-784 > FH-797> AGSUN-5270 > Suncross > Gulshin.
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Claims 9
Claim · model-written summary
Heat stress significantly decreased sunflower shoot and root lengths and fresh and dry weights.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- heat stresse0
- Outcome
- shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weighte0
- Direction
- decreasee0
- Comparator
- controlt1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat stress induced a significant (p < 0.05) decrease in shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weight”
t0“sunflower”
t1“control (25 °C)”
Claim · model-written summary
Heat stress significantly decreased chlorophyll a, chlorophyll b, and total chlorophyll.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- heat stresse0
- Outcome
- chlorophyll a, chlorophyll b, total chlorophylle0
- Direction
- decreasee0
- Comparator
- control (25 °C)t1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat stress induced a significant (p < 0.05) decrease in shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weight, chlorophyll a, chlorophyll b, total chlorophyll, and carotenoid content”
t0“sunflower”
t1“control (25 °C)”
Claim · model-written summary
Heat stress significantly decreased sunflower carotenoid content.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- heat stresse0
- Outcome
- carotenoid contente0
- Direction
- decreasee0
- Comparator
- control (25 °C)t1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat stress induced a significant (p < 0.05) decrease in shoot length, root length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weight, chlorophyll a, chlorophyll b, total chlorophyll, and carotenoid content”
t0“sunflower”
t1“control (25 °C)”
Claim · model-written summary
Heat stress increased malondialdehyde concentration.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- heat stresse1
- Outcome
- concentration of malondialdehyde (MDA)e0
- Direction
- increasinge0
- Comparator
- control (25 °C)t1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the concentration of malondialdehyde (MDA) and hydrogen peroxide (H2O2)”
t0“sunflower”
t1“control (25 °C)”
e1“heat stress induced a significant (p < 0.05) decrease”
Claim · model-written summary
Heat stress increased hydrogen peroxide concentration.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- heat stresse1
- Outcome
- hydrogen peroxide (H2O2)e0
- Direction
- increasinge0
- Comparator
- control (25 °C)t1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing the concentration of malondialdehyde (MDA) and hydrogen peroxide (H2O2)”
t0“sunflower”
t1“control (25 °C)”
e1“heat stress induced a significant (p < 0.05) decrease”
Claim · model-written summary
Heat stress increased flavonoid and phenolic content.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- heat stresse1
- Outcome
- content of flavonoid and phenolice0
- Direction
- increasinge0
- Comparator
- control (25 °C)t1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing content of flavonoid and phenolic”
t0“sunflower”
t1“control (25 °C)”
e1“heat stress induced a significant (p < 0.05) decrease”
Claim · model-written summary
Hysin-39, FH-825, and Hysin-33 showed better growth under heat stress and were classified heat tolerant.
- Taxon
- sunflowerHelianthus annuust0
- Material
- Hysin-39, FH-825, and Hysin-33e0
- Outcome
- growth and developmente0
- Direction
- bettere0
- Qualifier
- heat-stressed environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hysin-39, FH-825, and Hysin-33 showed better growth and development in heat-stressed environment and considered a heat-tolerant cultivar”
t0“sunflower”
Claim · model-written summary
Gulshin, Suncross, and AGSUN-5270 showed poor growth under heat stress and were classified heat sensitive.
- Taxon
- sunflowerHelianthus annuust0
- Material
- Gulshin, Suncross, and AGSUN-5270e0
- Outcome
- poor growth and developmente0
- Qualifier
- same stressed environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gulshin, Suncross, and AGSUN-5270 showed poor growth and development in the same stressed environment and were considered heat-sensitive cultivars”
t0“sunflower”
Claim · model-written summary
The reported heat tolerance ranking placed Hysin-39 first and Gulshin last.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- Hysin-39 > FH-825 > Hysin-33 > T-40 > H-OI > FH-784 > FH-797> AGSUN-5270 > Suncross > Gulshine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hysin-39 > FH-825 > Hysin-33 > T-40 > H-OI > FH-784 > FH-797> AGSUN-5270 > Suncross > Gulshin”
t0“sunflower”
The same questions in other papers
heat · growth · Helianthus annuus (common sunflower)Positive and negative results
6 papers in the same direction as this paper · 2 in the opposite direction
- negative
- positive
- positive
5 papers more in this group
See all 9 papers →heat · physiology: oxidative · Helianthus annuus (common sunflower)Results agree
1 paper in the same direction as this paper
- negative
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.