The Journal of Heredity 1997:88(1):52-56
© 1997 The American Genetic Association 88:52-56
research-article |
Genes for Developmental Fruit Coloration of Acorn Squash
Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center P.O. Haifa, 31-900, Israel
Abstract
Table Queen, an old cultivar of the acorn group of Cucurbita pepo, has fruits that are light green when young that become dark green by intermediate age and remain dark green through maturity. in order to determine the genetic basis of its devel opmental fruit color, Table Queen was crossed with three accessions of known genotype, Mgetabte Spaghettl (d/d l-1/l–1 l–2/l–2), Fordhook Zucchini (D/D L-1/L-1 L-2/L-2), and 85k–9–107–2 (d/d l-1/l-1 L-2/L-2). The progenies were observed and scored for fruit coloration at three developmental stages: young [2–5 days past anthesis (dpa)], intermediate (15–18 dpa), and mature (40–44 dpa). The results indicate that Table Queen possesses genotype D/D L-1/L-1 L/2/L-2. All of the accessions crossed with Table Queen carry two recessive genes, herein designated mature orange-1 (mo-1) and mature orange-2 (mo-2). The combination of these two recessive genes results in complete loss of green fruit color prior to maturity, except in L-1/-L-2/—plants. Table Queen fruits retain their green color through maturity because this cultivar carries the dominant alleles Mo-1 and Mo-2, either of which acting alone results in green color retention. Genes D and mo-2 are linked, approximately 15 map units apart.
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