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Proceedings Paper

Genotypic variation of soybean and cotton crops in their response to UV-B radiation for vegetative growth and physiology
Author(s): K. R. Reddy; S. Koti; V. G. Kakani; D. Zhao; W. Gao
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Paper Abstract

The effects of ultraviolet-B (UV-B) radiation on seven cotton (DP 458B/RR, DP 5415RR, FM 832B, NuCOTN 33B, Pima S7, Tamcot HQ95 and SG 521B) and six soybean (D 88-5320, D 90-9216, Stalwart III, PI 471938, DG 5630RR, and DP 4933RR) genotypes were evaluated in sunlit controlled-environment chambers under optimum water, nutrient and temperature conditions. Plants were exposed to UV-B radiation levels of 4, 8, 12 and 16 (cotton); and 0, 5, 10 and 15 kJ m-2 d-1 (soybean) from emergence to 31 days after sowing (DAS) in cotton and 58 DAS in soybean. Growth and physiological responses were measured and quantified. Higher UV-B significantly reduced dry matter production, plant height, leaf area in all genotypes compared to control plants in both the crops; however, significant genotypic differences in the magnitude of the UV-B induced changes were observed. Cumulative stress response index (CSRI), the sum of individual percentage of relative responses to UV-B radiation, total response index (TRI), the sum of CSRI at all the levels of UV-B for each genotype were used to classify the genotypes for UV-B tolerance. The TRI ranged from -195 to - 417 in soybean and -40 to -524 in cotton. Based on TRI, cotton genotypes, DP 458B/RR, NuCOTN 33B and DP 5415RR were classified as tolerant; Pima S7, and FM 832B as intermediate; and SG 521B, and Tamcot HQ95 as sensitive. In soybean, PI 471938 was tolerant; Stalwart III and D 88-5320 as intermediate; DG 5630RR, DP 4933RR and D 90-9216 were identified as sensitive genotypes. Even though, relative injury of the leaves decreased and phenolic concentrations increased with increasing UV-B in all genotypes, there were no significant correlations between these parameters and TRI of the genotypes in either crop. The observed genotypic differences suggest that it is possible to breed and select UV-B tolerant soybean and cotton genotypes for a niche environment.

Paper Details

Date Published: 10 September 2005
PDF: 13 pages
Proc. SPIE 5886, Ultraviolet Ground- and Space-based Measurements, Models, and Effects V, 58860K (10 September 2005); doi: 10.1117/12.619899
Show Author Affiliations
K. R. Reddy, Mississippi State Univ. (United States)
S. Koti, Mississippi State Univ. (United States)
V. G. Kakani, Mississippi State Univ. (United States)
D. Zhao, USDA-Agricultural Research Service (United States)
W. Gao, USDA UV-B Monitoring and Research Program, Colorado State Univ. (United States)

Published in SPIE Proceedings Vol. 5886:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects V
Germar Bernhard; James R. Slusser; Jay R. Herman; Wei Gao, Editor(s)

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