Abstract
Abstract Genetic adaptation of plants to innate environmental conditions has made them functionally diverse, and to predict how they will respond to a new environment is difficult. For example, cotton and lettuce were chlorotic when grown under low‐pressure sodium (LPS) but not chlorotic when grown under cool‐white fluorescent (CWF) lamps. Petunia was green under both type lamps. Chlorophyll synthesis in cotton and lettuce grown with CWF lamps was related to reduction of Fe3+ to Fe2+ in solutions. Plant species and cultivars differed in their response to Fe, Cu, Zn, Mn, B, and Mo deficiency stresses and in their tolerance to relatively high concentrations of either Mn or Al when grown in soils or in nutrient solutions. For example, Bragg soybean was Mn‐intolerant, Lee soybean was Mn‐tolerant and their progeny (B x L, L x B) varied in Mn‐tolerance when grown in a Mn‐toxic soil and in nutrient solutions containing 6.5 mg Mn/1. All plants contained about 500 mg Mn/μg dry matter top. Less Fe was absorbed and ...
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