Inheritance of heterodichogamy in pecan

Thompson, Tommy E.; Romberg, L. D.

doi:10.1093/oxfordjournals.jhered.a110144

Cited by 45 publications

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“…These results were possibly not due to the difference in the mortality rates and plant size between the two mating types, but rather to genetic control of the heterodichogamous mating systems as predicted by Gleeson (1982) and Thompson & Romberg (1985). Such a polymorphism with biased mating types would be controlled by a dominant-recessive Mendelian factor of one-locus and two-allele, with the protandry a recessive homozygote and the protogyny either the heterozygote or dominant homozygote (Gleeson 1982;Thompson & Romberg 1985). The increases in the duration of overlap withintype would alter the relative frequencies of the protogy- nous genotypes by increasing the dominant homozygote.…”

Section: Discussionmentioning

confidence: 90%

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Flowering system of heterodichogamous Juglans ailanthifolia

Kimura

Seiwa

Suyama

et al. 2003

Plant Species Biology

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To determine the sex-expression of Juglans ailanthifolia , we monitored its flowering phenology for 3 years in two natural populations and observed the following four mating types: protogyny, protandry, female and male. In each population, the number of protogynous trees was most numerous, followed by protandrous tree. These monoecious types constituted 61-95% of the individuals at each site in each year. Observations of flowering phenology of the monoecious types showed that female and male functions were temporally segregated within individual trees and that the sexual functions of each protogynous and protandrous mating type were synchronous and reciprocal. Such a system may help to reduce selfing and promote outcrossing. Trunk size was smaller in the unisexual types than in the monoecious types. Sixty-seven percent of trunks were oblique due to snow pressure in the unisexual types, whereas only 23% were oblique in the monoecious types. It seemed that unisexuality is a temporary trait because the changes in mating category occurred mainly from unisexual to monoecious types and inverse changes were very few.

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Section: Discussionmentioning

confidence: 90%

“…The single female flower has two feathery stigmas. Previous studies have pointed out that several Juglandaceae species are entirely self‐compatible (Thompson & Romberg 1985; Renner 2001).…”

Section: Methodsmentioning

confidence: 99%

Flowering system of heterodichogamous Juglans ailanthifolia

Kimura

Seiwa

Suyama

et al. 2003

Plant Species Biology

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“…The inheritance of the PA and PG morphs has been reported for both genera in 1980s (Gleeson, 1982; Thompson and Romberg, 1985). In Juglans , relative timing of floral development (Polito and Pinney, 1997), phenology and morph ratio in wild populations (Kimura et al , 2003; Bai et al , 2006), and patterns of gene flow between and within morphs (Bai et al , 2007) have been studied.…”

Section: Introductionmentioning

confidence: 91%

Inflorescence dimorphism, heterodichogamy and thrips pollination in Platycarya strobilacea (Juglandaceae)

Fukuhara

Tokumaru

2013

Annals of Botany

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Background and AimsUnlike other taxa in Juglandaceae or in closely related families, which are anemophilous, Platycarya strobilacea has been suggested to be entomophilous. In Juglandaceae, Juglans and Carya show heterodichogamy, a reproductive strategy in which two morphs coexist in a population and undergo synchronous reciprocal sex changes. However, there has been no study focusing on heterodichogamy in the other six or seven genera, including Platycarya.MethodsInflorescence architecture, sexual expression and pollination biology were examined in a P. strobilacea population in Japan. Flowering phenology was monitored daily for 24 trees in 2008 and 27 in 2009. Flower visitors and inhabitants were recorded or collected from different sexes and stages.Key resultsThe population of P. strobilacea showed heterodichogamous phenology with protogynous and duodichogamous–protandrous morphs. This dimorphism in dichogamy was associated with distinct inflorescence morphologies. Thrips pollination was suggested by the frequent presence of thrips with attached pollen grains, the scarcity of other insect visitors, the synchronicity of thrips number in male spikes with the maturation of female flowers, and morphological characters shared with previously reported thrips-pollinated plants. Male spikes went through two consecutive stages: bright yellow and strong-scented M1 stage, and brownish and little-scented M2 stage. The latter contained more thrips, synchronized better with the receptive stage of female flowers of the reciprocal morph and is probably the main period of pollen export.Conclusions Platycarya strobilaceais heterodichogamous and thrips-pollinated, both of which are relatively rare conditions in angiosperms. In male spikes of P. strobilacea, there is probably a temporal decoupling of pollinator attraction and pollen export.

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“…female flowers produced on the same tree but maturing at different times in a heterodichogamous blooming pattern that minimizes inbreeding (Thompson and Romberg 1985). Pollen is distributed by wind and may travel long distances.…”

Section: Communicated By a Dandekarmentioning

confidence: 99%

Geographic patterns of genetic variation in native pecans

Grauke¹,

Mendoza-Herrera

Miller

et al. 2011

Tree Genetics & Genomes

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A structured collection of 80 seedling pecan trees [Carya illinoinensis (Wangenh.) K. Koch], representing 19 putatively native pecan populations across the species range, was evaluated at three plastid and 14 nuclear microsatellite (simple sequence repeat, SSR) loci. Data were analyzed using a priori population designations and also within a Bayesian framework, in which individuals were assigned to clusters regardless of population of origin. Population genetic analyses using a priori populations, clusters based on chloroplast microsatellite data (cpSSR), and clusters based on nuclear microsatellite data (nSSR) yielded consistent results. For all groupings, cpSSR variation exhibited more geographic structure than the nSSR data.Furthermore, cpSSR microsatellite diversity decreased with increasing latitude, but this pattern was not observed with the nuclear data. Contrasting patterns in plastid and nuclear genetic diversity demonstrate unique aspects of postglacial recolonization reflected in the movement of seeds versus pollen. These data suggest that plastid SSRs are useful tools for identifying population structure in pecan and hold promise for ongoing efforts to identify and conserve representative germplasm in ex situ collections.

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Inheritance of heterodichogamy in pecan

Cited by 45 publications

References 0 publications

Flowering system of heterodichogamous Juglans ailanthifolia

Flowering system of heterodichogamous Juglans ailanthifolia

Inflorescence dimorphism, heterodichogamy and thrips pollination in Platycarya strobilacea (Juglandaceae)

Geographic patterns of genetic variation in native pecans

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