Do inefficient selfing and inbreeding depression challenge the persistence of the rare Dianthus guliae Janka (Caryophyllaceae)? Influence of reproductive traits on a plant's proneness to extinction
Identifieur interne : 005C73 ( Main/Merge ); précédent : 005C72; suivant : 005C74Do inefficient selfing and inbreeding depression challenge the persistence of the rare Dianthus guliae Janka (Caryophyllaceae)? Influence of reproductive traits on a plant's proneness to extinction
Auteurs : Domenico Gargano [Italie] ; Teresa Gullo ; Liliana BernardoSource :
- Plant Species Biology [ 0913-557X ] ; 2009-08.
Descripteurs français
English descriptors
- KwdEn :
- Abortion rate, American journal, Annual review, Authors journal compilation, Autonomous, Barrett charlesworth, Biology, Botanical garden, Calabria, Charlesworth, Collin, Competitive effects, Conservation biology, Della calabria, Dianthus, Dianthus guliae, Early stages, Ecology, Ecology evolution, Experimental plants, Experimental site, Genetic diversity, Genetic variability, Germination, Germination rate, Germination tests, Growth rate, Guliae, Guliae populations, High mortality, Historical range, Individual code, International journal, Italian peninsula, Kennedy elle, Lifespan, Lloyd schoen, Long time, Mortality rate, Mortality rates, Nutrient additions, Ower, Ower lifespan, Owering, Owering season, Owers, Perennial herb, Plant sciences, Plant species biology, Pollen donors, Pollen limitation, Pollen receipt, Pollination, Pollination rates, Population size, Progeny, Reproductive, Reproductive assurance, Reproductive biology, Reproductive constraints, Reproductive success, Reproductive traits, Resource availability, Root length, Same head, Scarce pollen transfer, Second season, Seed germination, Seed mass, Seed number, Seed quality, Seed weight, Selfed, Selfed offspring, Selfed progeny, Severe pollen limitation, Sexual expression, Small populations, Southern border, Species biology, Species biology plant species biology, Spontaneous pollinations, Standard deviation, Stigma emergence, Trait, Univocal code.
- Teeft :
- Abortion rate, American journal, Annual review, Authors journal compilation, Autonomous, Barrett charlesworth, Biology, Botanical garden, Calabria, Charlesworth, Collin, Competitive effects, Conservation biology, Della calabria, Dianthus, Dianthus guliae, Early stages, Ecology, Ecology evolution, Experimental plants, Experimental site, Genetic diversity, Genetic variability, Germination, Germination rate, Germination tests, Growth rate, Guliae, Guliae populations, High mortality, Historical range, Individual code, International journal, Italian peninsula, Kennedy elle, Lifespan, Lloyd schoen, Long time, Mortality rate, Mortality rates, Nutrient additions, Ower, Ower lifespan, Owering, Owering season, Owers, Perennial herb, Plant sciences, Plant species biology, Pollen donors, Pollen limitation, Pollen receipt, Pollination, Pollination rates, Population size, Progeny, Reproductive, Reproductive assurance, Reproductive biology, Reproductive constraints, Reproductive success, Reproductive traits, Resource availability, Root length, Same head, Scarce pollen transfer, Second season, Seed germination, Seed mass, Seed number, Seed quality, Seed weight, Selfed, Selfed offspring, Selfed progeny, Severe pollen limitation, Sexual expression, Small populations, Southern border, Species biology, Species biology plant species biology, Spontaneous pollinations, Standard deviation, Stigma emergence, Trait, Univocal code.
Abstract
The yellow carnation Dianthus guliae Janka is a rare endemic of the Italian peninsula. As numerous extinctions have occurred in the past, very few populations are still present. Two years of field surveys revealed high mortality and an absence of recruitment in the southernmost populations of this species. Work in a botanical garden, under semi‐natural conditions, revealed the occurrence of proterandrous hermaphroditism and self‐compatibility. The durable flower lifespan, the competitive effects among flowers and the different outcomes from spontaneous and hand‐performed pollinations (with both self‐ and cross‐pollen) suggested low pollination rates in the experimental stand. Pollinator exclusion experiments revealed a low frequency of delayed autonomous selfing, suggesting that self‐fertilization in D. guliae relies mainly on facilitated selfing and geitonogamy. Studies of inbreeding depression during the early life‐history stages revealed significant differences between selfed and crossed progenies in terms of seed mass, germination rates, developmental vigour and mortality rates. Therefore, when pollen delivery is scarce, the plant may fail reproductive assurance via autonomous selfing. The influence of inbreeding depression contributes to a further reduction in recruitment chances in very small D. guliae populations. Experimental reintroductions are urgent to avoid local extinction at the southern periphery of its range.
Url:
DOI: 10.1111/j.1442-1984.2009.00239.x
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calabria</term><term>Dianthus</term><term>Dianthus guliae</term><term>Early stages</term><term>Ecology</term><term>Ecology evolution</term><term>Experimental plants</term><term>Experimental site</term><term>Genetic diversity</term><term>Genetic variability</term><term>Germination</term><term>Germination rate</term><term>Germination tests</term><term>Growth rate</term><term>Guliae</term><term>Guliae populations</term><term>High mortality</term><term>Historical range</term><term>Individual code</term><term>International journal</term><term>Italian peninsula</term><term>Kennedy elle</term><term>Lifespan</term><term>Lloyd schoen</term><term>Long time</term><term>Mortality rate</term><term>Mortality rates</term><term>Nutrient additions</term><term>Ower</term><term>Ower lifespan</term><term>Owering</term><term>Owering season</term><term>Owers</term><term>Perennial herb</term><term>Plant sciences</term><term>Plant species biology</term><term>Pollen donors</term><term>Pollen limitation</term><term>Pollen receipt</term><term>Pollination</term><term>Pollination rates</term><term>Population size</term><term>Progeny</term><term>Reproductive</term><term>Reproductive assurance</term><term>Reproductive biology</term><term>Reproductive constraints</term><term>Reproductive success</term><term>Reproductive traits</term><term>Resource availability</term><term>Root length</term><term>Same head</term><term>Scarce pollen transfer</term><term>Second season</term><term>Seed germination</term><term>Seed mass</term><term>Seed number</term><term>Seed quality</term><term>Seed weight</term><term>Selfed</term><term>Selfed offspring</term><term>Selfed progeny</term><term>Severe pollen limitation</term><term>Sexual expression</term><term>Small populations</term><term>Southern border</term><term>Species biology</term><term>Species biology plant species biology</term><term>Spontaneous pollinations</term><term>Standard deviation</term><term>Stigma emergence</term><term>Trait</term><term>Univocal code</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Abortion rate</term><term>American journal</term><term>Annual review</term><term>Authors journal compilation</term><term>Autonomous</term><term>Barrett charlesworth</term><term>Biology</term><term>Botanical garden</term><term>Calabria</term><term>Charlesworth</term><term>Collin</term><term>Competitive effects</term><term>Conservation biology</term><term>Della calabria</term><term>Dianthus</term><term>Dianthus guliae</term><term>Early stages</term><term>Ecology</term><term>Ecology evolution</term><term>Experimental plants</term><term>Experimental site</term><term>Genetic diversity</term><term>Genetic variability</term><term>Germination</term><term>Germination rate</term><term>Germination tests</term><term>Growth rate</term><term>Guliae</term><term>Guliae populations</term><term>High mortality</term><term>Historical range</term><term>Individual code</term><term>International journal</term><term>Italian peninsula</term><term>Kennedy elle</term><term>Lifespan</term><term>Lloyd schoen</term><term>Long time</term><term>Mortality rate</term><term>Mortality rates</term><term>Nutrient additions</term><term>Ower</term><term>Ower lifespan</term><term>Owering</term><term>Owering season</term><term>Owers</term><term>Perennial herb</term><term>Plant sciences</term><term>Plant species biology</term><term>Pollen donors</term><term>Pollen limitation</term><term>Pollen receipt</term><term>Pollination</term><term>Pollination rates</term><term>Population size</term><term>Progeny</term><term>Reproductive</term><term>Reproductive assurance</term><term>Reproductive biology</term><term>Reproductive constraints</term><term>Reproductive success</term><term>Reproductive traits</term><term>Resource availability</term><term>Root length</term><term>Same head</term><term>Scarce pollen transfer</term><term>Second season</term><term>Seed germination</term><term>Seed mass</term><term>Seed number</term><term>Seed quality</term><term>Seed weight</term><term>Selfed</term><term>Selfed offspring</term><term>Selfed progeny</term><term>Severe pollen limitation</term><term>Sexual expression</term><term>Small populations</term><term>Southern border</term><term>Species biology</term><term>Species biology plant species biology</term><term>Spontaneous pollinations</term><term>Standard deviation</term><term>Stigma emergence</term><term>Trait</term><term>Univocal code</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Biologie</term><term>Calabre</term><term>écologie</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The yellow carnation Dianthus guliae Janka is a rare endemic of the Italian peninsula. As numerous extinctions have occurred in the past, very few populations are still present. Two years of field surveys revealed high mortality and an absence of recruitment in the southernmost populations of this species. Work in a botanical garden, under semi‐natural conditions, revealed the occurrence of proterandrous hermaphroditism and self‐compatibility. The durable flower lifespan, the competitive effects among flowers and the different outcomes from spontaneous and hand‐performed pollinations (with both self‐ and cross‐pollen) suggested low pollination rates in the experimental stand. Pollinator exclusion experiments revealed a low frequency of delayed autonomous selfing, suggesting that self‐fertilization in D. guliae relies mainly on facilitated selfing and geitonogamy. Studies of inbreeding depression during the early life‐history stages revealed significant differences between selfed and crossed progenies in terms of seed mass, germination rates, developmental vigour and mortality rates. Therefore, when pollen delivery is scarce, the plant may fail reproductive assurance via autonomous selfing. The influence of inbreeding depression contributes to a further reduction in recruitment chances in very small D. guliae populations. Experimental reintroductions are urgent to avoid local extinction at the southern periphery of its range.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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