Genes for "Reverse" fruit striping in squash (Cucurbita pepo)

Area of Science:

• Plant genetics
• Fruit morphology
• Cucurbita pepo genetics

Background:

• Longitudinal striping is a common fruit color pattern in Cucurbita pepo.
• Striping is controlled by alleles at the light coloration-1 locus.
• Reverse striping, where stripes are lighter than the background, is a less common variation.

Purpose of the Study:

• To elucidate the mode of inheritance of reverse striping in Cucurbita pepo.
• To identify the genetic factors responsible for reverse striping.

Main Methods:

• Genetic analysis of Cucurbita pepo populations exhibiting reverse striping.
• Phenotypic observation and characterization of fruit striping patterns.

Main Results:

• Reverse striping results from the complementary interaction of a striping allele with a new allele at the light coloration-2 locus, designated l-2(R).
• Homozygosity for l-2(R) in plants with a striping allele leads to completely reversed striping.
• Heterozygosity for l-2(R) results in normal, partially normal, or partially reversed striping.

Conclusions:

• A novel allele, l-2(R), at the light coloration-2 locus is identified as a key factor in reverse striping.
• The interaction between light coloration-1 and light coloration-2 loci determines the manifestation of reverse striping.
• This research clarifies the genetic basis of a unique fruit color pattern in Cucurbita pepo.