Abstract
A full-length cDNA clone encoding tomato (Lycopersicon esculentum Mill.) 5-aminolevulinic acid dehydratase (ALAD) was isolated and characterized. The primary structure predicts a 430-amino acid precursor which comprises a 41.7 kDa, 388-amino acid mature protein and a 47-amino acid transit sequence. The tomato primary sequence shows extensive homology to those of pea and spinach. Southern analysis indicated that 1 to 2 copies of the ALAD gene are present in the tomato genome. Northern blot analysis shows differential expression in various tomato organs, and constitutive developmental expression in tomato fruits.
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