Abstract
Various biotic and abiotic stresses adversely affect crop yield across the globe. Wheat is cool-season cereal crop and sensitive to rise in ambient growth temperature. Ninety genotypes were screened under heat stress and non-heat stress locations. Low heat susceptibility index of <0.5 for HD2189, N5643, Kenphad39, HD2501, NI179, NI5439, HS240, HD2428 and HD2687 indicated that they are heat tolerant and high susceptibility index of >1.5 for PBN142, NI9947, HD2320, GW190, HD2135, NI917 and Batavia indicated that they are heat susceptible. Based on grain yield and heat susceptibility index, two genotypes namely HD2189 and Batavia with contrasting response to heat stress were selected for the further studies. Their morphological and physiological characterization was carried out at seedling stage using 22°C as control and 33°C as heat stress. Under heat stress conditions, reduction for seedling growth traits, relative water content (RWC) and membrane thermostability (MTS) was less in HD2189 (25.3%, 10.2%, 13%) compared to Batavia (55.3%, 34.4%, 30%). HD2189 maintained lower canopy temperature with depression values in the range of 3.75 to 8°C compared to Batavia (2.82 to 5.10°C). The conversion of source to sink was better for HD2189 as displayed by translocated dry matter (TDM), translocation efficiency (TE), contribution of plant assimilates (CPA), longer duration of grain filling, grain yield and yield components under high temperature. Trend for electron transport rate of PSII (ETRII) and effective quantum yield (YII) for both the varieties at 22°C and 33°C was similar. However, Batavia plants were adjusting through non-regulated heat dissipation indicating damage to the photosynthetic apparatus whereas HD2189 showed higher regulated heat dissipation. Thus, genotype HD2189 showed heat tolerance at seedling and adult plant stages compared to Batavia.
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Claims 10
Claim · model-written summary
Nine named genotypes had low heat susceptibility indices and were heat tolerant.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- heat susceptibility indexe0
- Direction
- Lowe0
- Value
- <0.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low heat susceptibility index of <0.5 for HD2189, N5643, Kenphad39, HD2501, NI179, NI5439, HS240, HD2428 and HD2687 indicated that they are heat tolerant”
t0“wheat genotypes”
Claim · model-written summary
Seven named genotypes had high heat susceptibility indices and were heat susceptible.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- susceptibility indexe0
- Direction
- highe0
- Value
- >1.5e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high susceptibility index of >1.5 for PBN142, NI9947, HD2320, GW190, HD2135, NI917 and Batavia indicated that they are heat susceptible”
t0“wheat genotypes”
Claim · model-written summary
HD2189 had a smaller heat-related reduction in seedling growth traits than Batavia.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2189e0
- Treatment
- heat stress conditionse0
- Outcome
- seedling growth traitse0
- Direction
- lesse0
- Value
- 25.3%e0
- Comparator
- Bataviae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heat stress conditions, reduction for seedling growth traits, relative water content (RWC) and membrane thermostability (MTS) was less in HD2189 (25.3%, 10.2%, 13%) compared to Batavia (55.3%, 34.4%, 30%)”
t0“wheat genotypes”
Claim · model-written summary
HD2189 had a smaller heat-related reduction in relative water content than Batavia.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2189e0
- Treatment
- heat stress conditionse0
- Outcome
- relative water contente0
- Direction
- lesse0
- Value
- 10.2%e0
- Comparator
- Bataviae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heat stress conditions, reduction for seedling growth traits, relative water content (RWC) and membrane thermostability (MTS) was less in HD2189 (25.3%, 10.2%, 13%) compared to Batavia (55.3%, 34.4%, 30%)”
t0“wheat genotypes”
Claim · model-written summary
HD2189 had a smaller heat-related reduction in membrane thermostability than Batavia.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2189e0
- Treatment
- heat stress conditionse0
- Outcome
- membrane thermostabilitye0
- Direction
- lesse0
- Value
- 13%e0
- Comparator
- Bataviae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under heat stress conditions, reduction for seedling growth traits, relative water content (RWC) and membrane thermostability (MTS) was less in HD2189 (25.3%, 10.2%, 13%) compared to Batavia (55.3%, 34.4%, 30%)”
t0“wheat genotypes”
Claim · model-written summary
HD2189 maintained lower canopy temperature than Batavia.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2189e0
- Outcome
- canopy temperaturee0
- Direction
- lowere0
- Value
- 3.75 to 8°Ce0
- Qualifier
- 2.82 to 5.10°Ce0
- Comparator
- Bataviae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HD2189 maintained lower canopy temperature with depression values in the range of 3.75 to 8°C compared to Batavia (2.82 to 5.10°C)”
t0“wheat genotypes”
Claim · model-written summary
Source-to-sink conversion under high temperature was better in HD2189 than Batavia, reflected in dry matter transfer, grain filling, and yield measures.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2189e0
- Treatment
- high temperaturee0
- Outcome
- conversion of source to sinke0
- Direction
- bettere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The conversion of source to sink was better for HD2189 as displayed by translocated dry matter (TDM), translocation efficiency (TE), contribution of plant assimilates (CPA), longer duration of grain filling, grain yield and yield components under high temperature”
t0“wheat genotypes”
Claim · model-written summary
Both varieties showed similar electron transport rate and effective quantum yield trends at 22°C and 33°C.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 22°C and 33°Ce0
- Outcome
- electron transport rate of PSII (ETRII) and effective quantum yield (YII)e0
- Direction
- similare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Trend for electron transport rate of PSII (ETRII) and effective quantum yield (YII) for both the varieties at 22°C and 33°C was similar”
t0“wheat genotypes”
Claim · model-written summary
Batavia showed non-regulated heat dissipation, interpreted as photosynthetic apparatus damage.
- Taxon
- wheatTriticum aestivumt0
- Material
- Bataviae0
- Outcome
- non-regulated heat dissipatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Batavia plants were adjusting through non-regulated heat dissipation indicating damage to the photosynthetic apparatus”
t0“wheat genotypes”
Claim · model-written summary
HD2189 showed higher regulated heat dissipation.
- Taxon
- wheatTriticum aestivumt0
- Material
- HD2189e0
- Outcome
- regulated heat dissipatione0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HD2189 showed higher regulated heat dissipation”
t0“wheat genotypes”
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