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- Author or Editor: Andrew M. Torres x
Abstract
Leaf samples of over 100 avocado (Persea americana Mill.) cultivars and 8 other Persea species were analyzed for isozyme variation of peroxidase (PX), malate dehydrogenase (MDH), leucine aminopeptidase (LAP) and phosphoglucose mutase (PGM). MDH, LAP and PGM isozymes of leaf and mesocarp were identical. Isozymes of alcohol dehydrogenase (ADH) and glutamate oxaloacetate transaminase (GOT) were detected in mesocarps but were not available from leaves. Leaf PX isozymes were specified by 3 genes having 11 alleles and MDH isozymes by 1 gene with 3 alleles. To date, 6 enzyme systems specified by 12 genes with 37 codominant alleles are available as genetic markers of possible use in problems of avocado systematics, measurements of outcrossing rates, documentation of parentages and screening of seedlings in breeding programs.
Abstract
The distinction between apomictic nucellar and zygotic 5-month-old seedlings of Citrus was made using two genetically defined isozyme markers: phosphoglucose isomerase and phosphoglucose mutase. Of 123 seedlings of attempted crosses of ‘King’ (seed parent) × ‘Parsons Special’, 18 had the ‘King’ genotype and were therefore nucellars. Segregation ratios for both markers were as expected among the zygotics.