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Ancestral U.S. soybean cultivars characterized for tolerance to ultraviolet-B radiation



Ancestral U.S. soybean cultivars characterized for tolerance to ultraviolet-B radiation



Crop Science 32(5): 1214-1219



In an effort to characterize the U.S. soybean [Glycine max (L) Merr.] germplasm pool for variation in tolerance to ultraviolet-B (UV-B) radiation, 10 U.S. ancestral soybean cultivars were exposed in a greenhouse to a level of UV-B radiation simulating a 25% O2 depletion. Two modern cultivars previously characterized for UV-B sensitivity, Williams (tolerant) and Essex (sensitive), and 10 wild annual soybean (G. soja Sieb. & Zucc.) accessions of diverse geographic origin were also included in the study. Significant variation was observed among the G. max cultivars in UV-B radiation effects on leaf expansion, leaf area, height, aerial dry biomass, and seed yield. The cultivars CNS and Lincoln were consistently the most sensitive to UV-B radiation, while the cultivars Williams, Arksoy, Richland, Mandarin, Manchu, and Mukden were most tolerant. The wild G. soja accessions as a group were about as sensitive to UV-B radiation as the G. max cultivars, except that seed yield of G. soja accessions was not significantly reduced by UV-B radiation. There was, however, UV-B radiation treatment X genotype interaction for fewer growth traits among the wild G. soja accessions than among the G. max cultivars. Production of UV-B-absorbing compounds and specific leaf weight were both implicated as important contributing factors to UV-B radiation tolerance in G. max cultivars.

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Accession: 002301330

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