97271
Morphological Response of the Cotton Chromosome Substitution Lines for Low Temperature and Drought Stress.

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See more from this Session: Graduate Student Poster Competiton – Crops
Sunday, February 7, 2016
Hyatt Regency Riverwalk San Antonio , Regency Ballroom
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Akanksha Awasthi, Mississippi State University, Mississippi State, MS, Sukumar Saha, USDA-ARS, Starkville, MS, Johnie N. Jenkins, USDA-ARS, Mississippi State, MS, David M. Stelly, Soil and Crop Sciences Department, Texas A&M University, College Station, TX and K. Raja Reddy, Box 9555, Mississippi State University, Mississippi State, MS
The CS-lines constitute important breeding resources, increasing the genetic diversity available in Upland cotton. Two experiments were conducted by imposing low (day/night, 22/14 °C), well-watered optimum (30/22 °C), water stressed with optimum (30/22 °C) temperatures. Seeds were well-watered during emergence and seedling growth stages under optimum nutrient conditions using 21 CS-lines with parent TM-1 (G. hirsutum). Above and below-ground growth parameters were assessed at 25 d after seeding in both the experiments. Several root morphological traits were assessed using WinRHIZO root image analysis system. CS-lines varied significantly for many traits measured, particularly, days to 50% seedling emergence, plant height, dry matter weights, and root morphological parameters. CS-B08sh showed early emergence in both the experiments, but other CS-lines were not different from TM-1. Plant height at low temperature ranged from 0.2 cm (CS-B08sh) to 1.2 cm (CS-B02) with an average of 0.44 cm, and under drought stress it varies from 3.2cm (CS-T02) to 6.6cm (CS-M02) with an average of 4.8cm whereas at optimum temperature, it varied from 11.3 cm (CS-T02) to 17.4 cm (CS-B02) with the average of 14.8 cm. The average root diameter is greater (0.64 mm) at low temperature treatment than (0.47 mm) at optimum temperature while under drought stress it is about (0.46mm). Combined low temperature and drought response index, a measure of all response indices combined at low to optimum temperature and drought to optimum and well-watered, was used to categorize CS-lines early-season tolerance to low temperature and drought stress. Among the 21 CS-lines tested, CS-T04 and CSB08sh showed significantly higher and lower tolerance to low temperature compared to TM-1 while CS-T04 and CS-B-22sh showed significantly higher and lower tolerance to drought condition compared to TM-1. The identified low temperature and drought-tolerant CS-lines might be useful in cotton breeding programs for Upland cotton improvement.
See more from this Division: Submissions
See more from this Session: Graduate Student Poster Competiton – Crops