Florivory can facilitate rain-assisted autogamy in a deceptive tropical orchid

Cardoso, João Custódio Fernandes; Johnson, Steven D.; Maciel, Artur A.; Oliveira, Paulo Eugênio

doi:10.1007/s00114-021-01752-y

Sci Nat

2021

DOI: 10.1007/s00114-021-01752-y

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Florivory can facilitate rain-assisted autogamy in a deceptive tropical orchid

João Custódio Fernandes Cardoso

Steven D. Johnson

Artur A. Maciel

et al.

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2024

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Cited by 2 publications

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Flowers meet Newton: testing the role of gravitational pull in resupination of orchid flowers

Cardoso,

Johnson,

Oliveira

2024

Journal of Experimental Botany

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Resupination refers to the developmental orientation changes of flowers through ≈180º, leaving them effectively upside-down. It is a widespread trait present in 14 angiosperm families, including the Orchidaceae, where it is a gravitropic phenomenon actively controlled by auxins. Here, we demonstrate that the passive gravitational pull on flower parts can have an additional influence on resupination. We studied a lady’s slipper orchid in which some flowers naturally fail to resupinate. We conducted a manipulative experiment removing floral parts and showed that both the probability of complete resupination and the degree of flower vertical movement (from 0º – 180º) are related to the mass of floral organs. During flower development, the tip of the ovary slightly curves actively (14.75º) due to gravitropism. This promotes a lever arm effect so that the gravitational pull acting on flower mass creates a torque that bends the ovary, orienting the flower into a resupinate position that is accessible to pollinators. The role of the mass of floral organs in resupination provides new insights into flower development and its role in pollination mechanisms.

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Flowers meet Newton: testing the role of gravitational pull in resupination of orchid flowers

Cardoso,

Johnson,

Oliveira

2024

Journal of Experimental Botany

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Flowering Phenology and Pollination Process of Liparis gigantea (Orchidaceae) in Guangxi, China

Xiujin Qi,

Zhang,

Luo

et al. 2024

Biol Bull Russ Acad Sci

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Florivory can facilitate rain-assisted autogamy in a deceptive tropical orchid

Cited by 2 publications

References 22 publications

Flowers meet Newton: testing the role of gravitational pull in resupination of orchid flowers

Flowers meet Newton: testing the role of gravitational pull in resupination of orchid flowers

Flowering Phenology and Pollination Process of Liparis gigantea (Orchidaceae) in Guangxi, China

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