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Reddy, Kambham Raja; Bheemanahalli, Raju; Saha, Sukumar; Singh, Kulvir; Lokhande, Suresh B; Gajanayake, Bandara; Read, John J; Jenkins, Johnie N; Raska, Dwaine A; Santiago, Luis M De; Hulse-Kemp, Amanda M; Vaughn, Robert N; Stelly, David M
Plants (Basel), 12/2020, Volume: 9, Issue: 12Journal Article
Upland cotton ( L.) growth and development during the pre-and post-flowering stages are susceptible to high temperature and drought. We report the field-based characterization of multiple morpho-physiological and reproductive stress resilience traits in 11 interspecific chromosome substitution (CS) lines isogenic to each other and the inbred line TM-1. Significant genetic variability was detected ( < 0.001) in multiple traits in CS lines carrying chromosomes and chromosome segments from CS-B ( ) and CS-T ( ). Line CS-T15sh had a positive effect on photosynthesis (13%), stomatal conductance (33%), and transpiration (24%), and a canopy 6.8 °C cooler than TM-1. The average pollen germination was approximately 8% greater among the CS-B than CS-T lines. Based on the stress response index, three CS lines are identified as heat- and drought-tolerant (CS-T07, CS-B15sh, and CS-B18). The three lines demonstrated enhanced photosynthesis (14%), stomatal conductance (29%), transpiration (13%), and pollen germination (23.6%) compared to TM-1 under field conditions, i.e., traits that would expectedly enhance performance in stressful environments. The generated phenotypic data and stress-tolerance indices on novel CS lines, along with phenotypic methods, would help in developing new cultivars with improved resilience to the effects of global warming.
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