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Effect of HPT on roots from inbred W22 line of the Sh1Sus1 homozygous wild-type (1) and the sh1sus1 double-mutant (2) genotype. Intact seedlings were placed overnight on floats over nutrient medium bubbled with 3% O2 in N2 (HPT) or with 50% O2 in N2 (NHPT). After a subsequent 24-h anoxic treatment, the seedlings were removed and placed between two layers of moist filter paper for 48 h.
