Jul 26, 2013

Floral longevity and autonomous selfing are altered by pollination and water availability in Collinsia heterophylla

Annals of Botany
Rachael Jorgensen, H S Arathi

Abstract

A plant investing in reproduction partitions resources between flowering and seed production. Under resource limitation, altered allocations may result in floral trait variations, leading to compromised fecundity. Floral longevity and timing of selfing are often the traits most likely to be affected. The duration of corolla retention determines whether fecundity results from outcrossing or by delayed selfing-mediated reproductive assurance. In this study, the role of pollination schedules and soil water availability on floral longevity and seed production is tested in Collinsia heterophylla (Plantaginaceae). Using three different watering regimes and pollination schedules, effects on floral longevity and seed production were studied in this protandrous, flowering annual. The results reveal that soil water status and pollination together influence floral longevity with low soil water and hand-pollinations early in the floral lifespan reducing longevity. However, early pollinations under excess water did not extend longevity, implying that resource surplus does not lengthen the outcrossing period. The results also indicate that pollen receipt, a reliable cue for fecundity, accelerates flower drop. Early corolla abscission under d...Continue Reading

Mentioned in this Paper

Fertility
Plant Carpals
Reproduction
Abscission
Pollen
Humus
Mating
Flowering
Pollination
Corolla (plant part)

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