Reproductive biology of an endemic orchid Cypripedium smithii in China and reproductive isolation between C. smithii and C. tibeticum

doi:10.3724/SP.J.1003.2009.09046

Abstract

Abstract:

Pollinator specificity has traditionally been considered as the main mechanism of reproductive isolation in orchids. Cypripedium smithii and C. tibeticum are two closely related species with similar characters and sympatric distributions. With the knowledge of reproductive biology of C. tibeticum, we studied the reproductive biology of C. smithii and compared the morphological characters between C. tibeticum and C. smithii. The results showed that a series of intermediate types occurred between typical C. smithiiand typical C. tibeticum, indicating that no distinct taxonomic boundary existed between C. tibeticum and C. smithii. Pollination experiment showed that both C. smithii and C. tibeticum were pollinated by bumble queens. The hand-pollination experiments indicated that C. tibeticum and C. smithii were cross-fertilized, so that they could hybridize in the natural conditions and produced transitional types. It is better to combine them as one identical species rather than separate them as two distinct species.

Key words: Orchidaceae, pollination, reproductive isolation, hybridization

Peng Li, Yibo Luo. Reproductive biology of an endemic orchid Cypripedium smithii in China and reproductive isolation between C. smithii and C. tibeticum[J]. Biodiv Sci, 2009, 17(4): 406-413.

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URL: https://www.biodiversity-science.net/EN/10.3724/SP.J.1003.2009.09046

https://www.biodiversity-science.net/EN/Y2009/V17/I4/406

Figures/Tables 3

References 38

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处理 Treatment	花数 No. of flowers	果数 No. of fruits	结实率 Fruit set (%)
褐花杓兰人工自交授粉 Hand self-pollination in C. smithii	10	9	90
褐花杓兰人工异交授粉 Hand cross-pollination in C. smithii	10	8	80
褐花杓兰开花前套袋 Bagged before flowers in C. smithii	5	0	0
褐花杓兰 ♀ × 西藏杓兰 ♂ C.smithii ♀ × C. tibeticum♂	10	8	80
褐花杓兰 ♂ × 西藏杓兰 ♀ C.smithii♂ × C. tibeticum♀	10	8	80
褐花杓兰自然结实(2005) Natural pollination of C. smithii (2005)	28	14	50
褐花杓兰自然结实(2006) Natural pollination of C. smithii (2006)	33	15	45.5

处理 Treatment	花数 No. of flowers	果数 No. of fruits	结实率 Fruit set (%)
褐花杓兰人工自交授粉 Hand self-pollination in C. smithii	10	9	90
褐花杓兰人工异交授粉 Hand cross-pollination in C. smithii	10	8	80
褐花杓兰开花前套袋 Bagged before flowers in C. smithii	5	0	0
褐花杓兰 ♀ × 西藏杓兰 ♂ C.smithii ♀ × C. tibeticum♂	10	8	80
褐花杓兰 ♂ × 西藏杓兰 ♀ C.smithii♂ × C. tibeticum♀	10	8	80
褐花杓兰自然结实(2005) Natural pollination of C. smithii (2005)	28	14	50
褐花杓兰自然结实(2006) Natural pollination of C. smithii (2006)	33	15	45.5