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boron - leaves often with numerous dead spots on blades...

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boron influences Ca 2+ utilization, formation of nucleic acids, maintenance of membranes; essential for growth of pollen tubes young tissues most affected; apical meristems die; root tips swollen and discolored; young leaves yellow at base, twisted copper Cu 2 or Cu 2+ activator of enzymes, present in some; involved in oxidation-reduction wilting and twisting of dark green young
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Unformatted text preview: leaves; often with numerous dead spots on blades; copper is rarely deficient manganese Mn 2+ activator of enzymes, required for O 2 release in photosynthesis, integrity of the chloroplast membrane; electron transfers interveinal chlorosis and dead spots; thylakoid membranes disintegrate...
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