Self‐Compatibility/Incompatibility in Some Orchids of the Subfamily Vandoideae

Agnew, John

doi:10.1111/j.1439-0523.1986.tb01049.x

Cited by 14 publications

(9 citation statements)

References 5 publications

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“…The incidence and extent of SI in many outbreeding orchid genera is still not known or poorly understood. However, the previous low estimates of SI in the Orchidaceae are proving to be inaccurate, and a growing volume of literature suggests that SI is widespread in both New and Old World orchid genera (Charanasri and Kamemoto, 1977; Stort and de Lima Galdino, 1984; Agnew, 1986; Johansen, 1990; Christensen, 1992; Borba et al, 2002; Blanco and Barbosa, 2005; Tremblay and Ackerman, 2007; Barbosa et al, 2009; Cheng et al, 2009; Gontijo et al, 2010). While within the Pleurothallidinae, a recent study (Borba et al, 2011) has identified the operation of SI in seven of the main clades of Pleurothallidinae (Pridgeon and Chase, 2001), and the current study has confirmed the operation of SI in the remaining clade, namely clade B (Pridgeon and Chase, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Although studied in many angiosperm families, SI is often considered relatively rare in the Orchidaceae, with most species being self-compatible and "avoiding" self-pollination by other means ( Agnew, 1986 ;Dressler, 1990Dressler, , 1993Borba and Semir, 1999 ;Singer and Cocucci, 1999 ;Borba et al, 2001 ;Ingrouille and Eddie, 2006 ;Roberts, 2003 ;Gontijo et al, 2010 ). Dressler (1990Dressler ( , 1993 ) estimated SI to occur in 10% of orchid species, but considered its full extent still to be established ( Dressler, 1993 ).…”

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confidence: 99%

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An investigation of self‐incompatibility within the genus Restrepia

Millner

McCrea

Baldwin

2015

American J of Botany

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

An investigation of self‐incompatibility within the genus Restrepia

Millner

McCrea

Baldwin

2015

American J of Botany

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“…1982; Ackerman & Oliver 1985; Kjellsson et al. 1985; Agnew 1986; Kjellsson & Rasmussen 1987; Clifford 1988; Johansen 1990), the family is thought to be largely self‐compatible.…”

Section: Discussionmentioning

confidence: 99%

Rapid floral senescence following male function and breeding systems of some tropical orchids

Huda

Wilcock

2011

Plant Biology

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No comparative study of floral senescence following male function among a range of tropical orchid genera has previously been undertaken. The timing and pattern of floral senescence and occurrence of fruit formation were studied following self-, geitonogamous and cross-pollination in 14 epiphytic and two terrestrial orchid species to determine their breeding system and assess the occurrence of floral abscission following pollinaria removal. Both pollination and pollinaria removal caused rapid floral senescence, and the pattern and timing of the floral changes were the same in all treatments. Six Dendrobium species and Pelatantheria insectifera were self-incompatible (SI) and eight other species, including one terrestrial species, were self-compatible (SC). Capsules produced from outcrossing in four SC species, Phalaenopsis cornu-cervi, Eria pubescens, Cleisostoma appendiculatum and Arundina graminifolia, were larger and heavier than those produced after selfing. Reductions in flower life span following pollinaria removal were positively correlated with flower size and longevity of unpollinated flowers but not with position in the inflorescence or nature of the breeding system. Rapid flower senescence following pollinaria removal reported here suggests that it may be widespread in tropical species. The significant association of the response with size of flowers and inflorescences among the species studied suggests that the cost of flower maintenance outweighs the benefit of remaining open for female function after pollinaria have been removed. Both SC and SI species were found among tropical orchids, but variation in capsule size following self- and cross-pollination indicates that there may be a reduction in seed production following selfing, even in SC species, and that fruit formation alone should not be taken as reliable evidence of full self-compatibility.

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“…Ackerman (1986) showed that tropical orchids have generally smaller population sizes and suggested that this may reduce their ability to sustain pollinators, even when a reward is present. Self-incompatibility, although uncommon in orchids (Calder et al 1982;Ackerman and Oliver 1985;Kjellson et al 1985;Agnew 1986;Kjellson and Ramussen 1987;CliVord 1988), is usually also associated with very low levels of fruit set (Neiland and Wilcock 1998). However, the combined impact of habit, Xoral traits and population size on the reproductive success of tropical orchids has not so far been studied.…”

Section: Introductionmentioning

confidence: 94%

Impact of floral traits on the reproductive success of epiphytic and terrestrial tropical orchids

Huda

Wilcock

2007

Oecologia

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We investigated the relationship between habit, population size, floral traits and natural fruit set levels of 23 tropical orchid species of south-east Bangladesh. We showed that epiphytic orchids had lower fruit set levels than terrestrial species and that habit explained much of the variation in floral traits among the orchids. We compared our results with data from 76 other species occurring in the study area and hypothesize that a suite of floral and population characteristics present in tropical orchids combine in epiphytes to reduce their reproductive success. Characteristics which, in addition to their habit, are associated with low reproductive success are small population size, small inflorescences, non-sectile pollinia and self-incompatibility. Several of these characteristics were phylogenetically conserved and we predict that epiphytes might therefore generally have lower fruit set levels than recorded in terrestrial species. Nectar rewards are uncommon in tropical orchids and nectarless species have displays of larger flowers, which may represent an adaptation to increase pollinator attraction, although other rewards such as oils, waxes and pseudo pollen may replace nectar. We suggest that, like many temperate orchids, a high proportion of tropical orchids may lack floral rewards and be pollinated by deceit.

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Self‐Compatibility/Incompatibility in Some Orchids of the Subfamily Vandoideae

Cited by 14 publications

References 5 publications

An investigation of self‐incompatibility within the genus Restrepia

An investigation of self‐incompatibility within the genus Restrepia

Rapid floral senescence following male function and breeding systems of some tropical orchids

Impact of floral traits on the reproductive success of epiphytic and terrestrial tropical orchids

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