Abstract
Abstract Several crop cultivars were tested for their Fe‐deficiency stress tolerance and susceptibility, using solution culture with Fe and without Fe. The criteria employed were the onset of and recovery from chlorosis and change in pH. While in sorghum, peanut, cotton, sesame, and chickpea, the recovery was associated with decrease in pH, there was no relationship between these two factors in lentil, in which two cultivars behaved differently. In VI‐1, the pH decreased only to a small extent, but the plants turned green. On the other hand, in S‐34, the pH decreased considerably but no recovery was obtained. In sorghum and jute, we identified DBP (dibutyl phthalate) in the stress medium of tolerant cultivars (Kannan et a]. 1984; Ramani et al. 1986) and the addition of DBP caused the chlorotic sorghum and jute to recover from chlorosis. The chemical from the nutrient medium of Fe‐stressed tomato cultivars was extracted and identified as caffeic acid. However, plants within cultivars of tomato and sorghum ...
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