THE INFLUENCE OF FLOWER COLOR ON OUTCROSSING RATE AND MALE REPRODUCTIVE SUCCESS IN IPOMOEA PURPUREA

Area of Science:

• Plant genetics
• Evolutionary biology
• Ecology

Background:

• Flower color is a key trait influencing plant-pollinator interactions and mating systems.
• Ipomoea purpurea (morning glory) exhibits distinct pigmented and white flower color morphs, offering a model for studying selection.

Purpose of the Study:

• To investigate the impact of flower color morphs on outcrossing rates in Ipomoea purpurea.
• To determine how flower color influences reproductive success, specifically from the perspective of a male parent (pollen donor).

Main Methods:

• Experimental populations of Ipomoea purpurea with pigmented and white morphs were established.
• Parent and offspring genotypes were analyzed to assess outcrossing rates and reproductive success.
• Mating system dynamics were inferred from genetic data.

Main Results:

• Both pigmented and white morphs of Ipomoea purpurea exhibit similar outcrossing rates.
• The white flower color morph demonstrates a significant advantage as a pollen donor.
• Direct pollinator observations may not accurately reflect the true mating system.

Conclusions:

• Selection dynamics at the flower color locus are more intricate than previously assumed.
• Frequency-dependent outcrossing rates and epistatic effects of the white allele could influence mating success.
• Relying solely on pollinator behavior can lead to misconceptions about plant mating systems.