The Pollination Biology of Begonia Guangxiensis, a Narrowly Distributed Species

doi:10.7525/j.issn.1673-5102.2023.03.013

Abstract

Abstract:

To examine the mating system of Begonia guangxiensis and whether the species relies on particular pollinators in its native habitat for pollination and whether it can achieve sexual reproduction in artificial habitats， the experiment of floral longevity observation， floral traits determination， pollination， flower visitor observation and seed germination determination of B. guangxiensis were carried out in this study. The result showed that B. guangxiensis had a long floral longevity， and the corolla sizes varied in different habitats； there was no significant difference in the proportion fruit set and seed germination rate between self-pollination and cross-pollination treatments and natural control between the two habitats； flower visitors included bees（Apis cerana， Bombus eximius） and hoverflies（Episyrphus balteatus， Ischiodon scutellaris）， and the visitor composition varied with habitats and years. All the results consistently indicated that the self-compatible B. guangxiensis relied on pollinators for sexual reproduction， but did not rely on a particular type of pollinator， but had a more generalized pollination system， and therefore could reproduce successfully in unnatural habitats.

Key words: Begonia guangxiensis, narrowly distributed species, parthenotype, pollination biology, mating system, floral longevity

CLC Number:

Q948.12

Qiongyue LIANG, Changqiu LIU, Qifeng LU, Tao DENG, Bo CAI. The Pollination Biology of Begonia Guangxiensis, a Narrowly Distributed Species[J]. Bulletin of Botanical Research, 2023, 43(3): 432-438.

Figures/Tables 5

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测量性状 Traits	自然生境（n=30） Natural habitat	人工生境（n=26） Artificial habitat	P
雌雄花数量比 Male and female flower ratio	0.42±0.03	0.30±0.02	0.012
雄花直径 Male flower diameter/mm	39.77±1.77	57.82±1.39	<0.001
雌花直径 Female flower diameter/mm	52.13±2.31	44.56±1.33	0.014
花药长 Anther length/mm	5.87±0.22	6.00±0.24	0.679
花药直径 Anther diameter/mm	7.17±0.19	6.69±0.21	0.098
花柱长 Stigma length/mm	6.67±0.35	6.59±0.24	0.866
柱头直径 Stigma diameter/mm	8.77±0.30	5.92±0.37	<0.001

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