lecture 02 - Comparison of Plant Reproductive Strategies...

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1/9/2011 1 Comparison of Plant Reproductive Strategies Plant Sexual Reproduction • Most common strategy in nature – Inexpensive, way to avoid disease transfer – Results in genetic variation in the offspring - each parent contributes 1/2 of the offspring’s DNA – Confers an adaptive advantage to the organism - ie. Irish potato famine •Group of plants propagated from seeds: •Are called a seedling population •Are genetically variable - Provide opportunity to select for new, useful traits - Challenge to maintain trait of interest Plant Sexual Reproduction Challenge for plant propagation Maintaining a cultivar that is True-to-Type - Trait of interest has been fixed through breeding How can the trait maintained? Maintaining a cultivar that is True-to-Type Option #1 – Identify genes contributing to the trail and select seeds to ensure all genes are homozygous X Pp Pp PP Pp Pp pp
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1/9/2011 2 X PP PP PP PP PP PP X pp pp pp pp pp pp “A quantitative trait is the result of many interacting genes that are expressed uniquely in different environments.” Quantitative Traits Maintaining a cultivar that is True-to-Type Maintaining a cultivar that is True-to-Type Option #2 – Vegetative propagation Plants originating by a single source plant by vegetative propagation: Called a “ clonal population
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  • Spring '08
  • Staff
  • asexual propagation, Grafting, Dogwood Quince Crapemyrtle Cottonwood Junipers Viburnum Privet Honeysuckle Potentilla Elderberry Euonymus Spirea Sycamore Weigela Wisteria, Plant Reproductive Strategies

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