scholarly journals GENETIC VARIATION IN RELATIVE CELL INJURY FOR BREEDING UPLAND COTTON UNDER HIGH TEMPERATURE STRESS

2017 ◽  
Author(s):  
Noshair Khan ◽  
Irshad Ahmad ◽  
Muhammad Tehseen Azhar
Keyword(s):  
Genetic Variation ◽  
High Temperature ◽  
Temperature Stress ◽  
Upland Cotton ◽  
Cell Injury ◽  
High Temperature Stress

scholarly journals Genetic Variation and Genotype by Environment Interaction for Heat Tolerance in Crisphead Lettuce

HortScience ◽  
2020 ◽  
pp. 1-10
Author(s):  
Abbas Lafta ◽  
Germán Sandoya ◽  
Beiquan Mou
Keyword(s):  
Genetic Variation ◽  
High Temperature ◽  
Temperature Stress ◽  
Heat Tolerance ◽  
The United States ◽  
Genotype By Environment Interaction ◽  
High Temperature Stress ◽  
Past Century ◽  
Environment Interaction ◽  
Horticultural Traits

Lettuce (Lactuca sativa L.) is a cool season crop that is vulnerable to high temperature stress, which promotes bolting and decreases yield and quality. It is anticipated that climate change may lead to higher temperatures in current lettuce growing areas in the United States, thereby negatively affecting lettuce production and possibly resulting in adverse impacts on global food production. Therefore, it is important to identify lettuce germplasm with tolerance to temperatures higher than those that have occurred over the past century. We evaluated 25 crisphead lettuce cultivars for tolerance to high temperature stress in the San Joaquin, Imperial, and Salinas Valleys, CA. Genetic variation was identified for yield and horticultural traits, such as core length, head diameter, tipburn, bolting, and market maturity, of crisphead lettuce grown in warmer conditions. Significant genotype × environment interaction did not account for most of the variation; the main differences were found for environments and only a small proportion of the variation was due to genotypes. Cultivar Primetime is a good source of heat tolerance for crisphead lettuce, as it presented the best yield and exhibited other desirable characteristics across warmer conditions. These results provide insight into the cultivars that respond well to hot environments. Moreover, the data can be used by breeders to develop new heat-tolerant lettuce cultivars.

Genetic variability in cotton germplasm: predicting the agro physiological markers for high-temperature tolerance

2021 ◽  
pp. 1-12
Author(s):  
Amjad Farooq ◽  
Amir Shakeel ◽  
Waqas Shafqat Chattha ◽  
Tariq Manzoor Khan ◽  
Muhammad Tehseen Azhar ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Stress ◽  
Cell Injury ◽  
High Temperature Stress ◽  
Temperature Tolerance ◽  
Direct Selection ◽  
Cotton Production ◽  
High Temperature Tolerance ◽  
Cotton Genotypes ◽  
Physiological Markers

Abstract High temperature negatively affects cotton production worldwide. In Pakistan, cotton crop faces high temperature at peak flowering during June–July, which is a major reason for yield losses. The present study was conducted to find some agro-physiological markers for high-temperature tolerance. Fifty cotton genotypes were raised under normal sown (high-temperature stress) and late sown (optimum temperature) conditions for 2 years. Data were recorded for relative cell injury percentage (RCI), chlorophyll content (CC), canopy temperature (CT), boll retention percentage (BR), bolls per plant (BP), boll weight (BW), hundred seed weight (HSW), sympodial branches per plant (SBP), plant height (PH) and seed cotton yield (SCY). A large amount of variability was found among cotton genotypes as proved by descriptive statistics. Stable genotypes were selected based on higher SCY and yield components (BP, BW, HSW, SBP, PH and SCY) performance along with less RCI%, high CC and low CT. The results of heatmap analysis showed that the six cotton genotypes viz., FH-Noor, FH-Lalazar, FH-458, FH-466, NIAB-545 and NIAB-878 performed better under high-temperature stress. These selected genotypes can be a source for breeding high-temperature tolerance. Furthermore, the results from correlation analysis confirmed that the traits such as RCI%, CC and CT can be considered as early selection criteria due to their positive association with SCY. Whilst some other parameters such as BP, BW, BR, SBP and PH might be used as direct selection indices for SCY under high-temperature stress.

Assessment of wheat (Triticum aestivum L.) genotypes for high temperature stress tolerance using physico-chemical analysis

2020 ◽  
Vol 53 (2) ◽  
Author(s):  
Khalil Ahmed Laghari ◽  
Abdul Jabbar Pirzada ◽  
Mahboob Ali Sial ◽  
Muhammad Athar Khan ◽  
Jamal Uddin Mangi
Keyword(s):  
Triticum Aestivum ◽  
High Temperature ◽  
Chemical Analysis ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
Triticum Aestivum L ◽  
High Temperature Stress ◽  
Physico Chemical
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