scholarly journals The mechanism of delayed selfing in Collinsia verna (Scrophulariaceae)

1999 ◽  
Vol 86 (9) ◽  
pp. 1239-1247 ◽  
Author(s):  
Susan Kalisz ◽  
Donna Vogler ◽  
Brook Fails ◽  
Matt Finer ◽  
Erica Shepard ◽  
...  
Keyword(s):  
Delayed Selfing ◽  
Collinsia Verna

scholarly journals Late-acting self-incompatible system, preferential allogamy and delayed selfing in the heterostylous invasive populations of Ludwigia grandiflora subsp. hexapetala

2021 ◽  
Author(s):  
Luis O. Portillo Lemus ◽  
Maryline Harang ◽  
Michel Bozec ◽  
Jacques Haury ◽  
Solenn Stoeckel ◽  
...  
Keyword(s):  
Mating System ◽  
Structural Characteristics ◽  
Local Population ◽  
Pollen Tubes ◽  
The Self ◽  
Invasion Success ◽  
Mixed Mating ◽  
Delayed Selfing ◽  
Flowering Season ◽  
Ludwigia Grandiflora

Mating system influences local population genetic structure, effective size, offspring fitness and functional variation. Determining the respective importance of self- and cross-fertilization in hermaphroditic flowering plants is thus important to understand their ecology and evolution. The worldwide invasive species, Ludwigia grandiflora subsp. hexapetala (Lgh) presents two floral morphs: one self-compatible short-styled morph (S-morph) and one self-incompatible long-styled morph (L-morph). Most invasive populations worldwide are only composed of self-incompatible L-morphs, which questions the importance of sexual reproduction during the invasion. In this study, we identified the mating systems of western European experimental and natural populations of Lgh by comparing structural characteristics of pollen and style, by studying self- and cross-pollen tube elongations and the viability of the resulting seeds and seedlings in both morphs. Our results showed no differences in pollen shape and stigma surfaces among and between the two floral morphs. In the self-incompatible L-morph flowers, self-pollen tubes were stopped tardily, in the ovarian area, and were unable to fertilize the ovules. This first formal identification of a late-acting, prezygotic self-incompatible system in Ludwigia genus questions on the distribution of this mating system in the Myrtales order. In the self-compatible S-morph flowers, rarer in worldwide invasive populations, self-pollen always succeeded to self-fertilize the ovules that nearly all developed into viable seedlings. However, cross-pollen tubes always elongated faster than self-pollen tubes. S-morph individuals may thus advantage preferential allogamy over selfing when cross-pollen is available despite its self-compatibility. As expected in late-acting self-incompatible systems, L-morph flowers authorised 0.2‰ of selfed seeds during the uppermost flowering season, that increased to 1‰ at the end of the flowering season. Such delayed selfing resulting in a significant quantity of viable floating seeds may contribute to the local regeneration, seed bank and propagation of the L-morph, which may explain its invasion success worldwide. Management plans of Lgh would gain to consider the mixed mating system we identified.

scholarly journals Occurrence, costs and heritability of delayed selfing in a free-living flatworm

2012 ◽  
Vol 25 (12) ◽  
pp. 2559-2568 ◽  
Author(s):  
S. A. Ramm ◽  
D. B. Vizoso ◽  
L. Schärer
Keyword(s):  
Free Living ◽  
Delayed Selfing

scholarly journals Intraspecific variation in nuclear DNA content in Collinsia verna nutt. (Scrophulariaceae)

Heredity ◽  
1984 ◽  
Vol 52 (2) ◽  
pp. 235-242 ◽  
Author(s):  
Judith K Greenlee ◽  
K S Rai ◽  
Alton D Floyd
Keyword(s):  
Intraspecific Variation ◽  
Dna Content ◽  
Nuclear Dna ◽  
Nuclear Dna Content ◽  
Collinsia Verna

scholarly journals NO CORRELATION BETWEEN INBREEDING DEPRESSION AND DELAYED SELFING IN THE FRESHWATER SNAIL PHYSA ACUTA

Evolution ◽  
2007 ◽  
Vol 61 (11) ◽  
pp. 2655-2670 ◽  
Author(s):  
Juan Sebastián Escobar ◽  
Guillaume Epinat ◽  
Violette Sarda ◽  
Patrice David
Keyword(s):  
Inbreeding Depression ◽  
Freshwater Snail ◽  
Physa Acuta ◽  
Delayed Selfing

Delayed selfing and low levels of inbreeding depression in Hibiscus trionum (Malvaceae)

2003 ◽  
Vol 51 (3) ◽  
pp. 275 ◽  
Author(s):  
Mike Ramsey ◽  
Leahwyn Seed ◽  
Glenda Vaughton
Keyword(s):  
Life Cycle ◽  
Seed Production ◽  
Inbreeding Depression ◽  
Flower Production ◽  
Delayed Selfing ◽  
Life Cycle Stages ◽  
Hibiscus Trionum ◽  
Eastern Australia ◽  
Annual Herb ◽  
Low Levels

We used experimental pollinations to examine the breeding system and inbreeding depression in Hibiscus trionum L., an annual herb of cultivated and disturbed sites in eastern Australia. Seeds were not produced asexually. Flowers were fully self-compatible and autonomously self-pollinating. Autonomous self-pollination was due to a delayed selfing mechanism that gave precedence to cross pollen but ensured that stigmas contacted the anthers at the end of floral life. Using selfed and crossed progeny from 10 maternal plants, we examined the magnitude and timing of inbreeding depression over a range of life-cycle stages, including seed production by maternal plants, and seed germination, seedling growth, survival, flowering and seed production by F1 plants. Average cumulative inbreeding depression was 0.15, although there was considerable variation among maternal families (δ = –0.07–0.43). Inbreeding depression was not uniform across all life stages and was most prevalent late in the life cycle, affecting days to flowering and fruiting and flower production. Our results indicate that major lethal alleles have been purged from this population, probably through high levels of recurrent self-fertilisation. The flexibility in plant mating afforded by delayed selfing is likely to contribute to the invasiveness of H. trionum, particularly in annual cropping situations.

scholarly journals Prior selfing occur in larger flowers in a mixed mating species with delayed selfing

2021 ◽  
Author(s):  
Kana Masuda ◽  
Atushi Ushimaru
Keyword(s):  
Flower Size ◽  
Reproductive Interference ◽  
Mixed Mating ◽  
Selfing Rate ◽  
Pollinator Limitation ◽  
Commelina Communis ◽  
Delayed Selfing ◽  
Self Pollination ◽  
Unexpected Findings

Theory predicts that prior self-pollination (prior selfing) should not evolve in mixed mating species that enable delayed selfing. In this study, we test the hypotheais that prior selfing has evolved under severe pollinator limitation in the mixed mating species Commelina communis which can reproduce via delayed selfing. The hypothesis predicts that prior selfing occurs more frequently in populations with very low pollinator availability and/or in smaller flowers which receive infrequent visitations. We tested the predictions by comparing the degree of prior selfing among ten populations experiencing various levels of pollinator limitation and by examining a relationship between individual flower size and the occurrence of prior selfing. Populations with higher pollinator availability had higher prior selfing rate. Moreover, prior selfing occurs more frequently in larger flowers. These findings were totally opposite patterns of the predictions and the previous findings. We proposed new hypotheses that prior selfing has been maintained by the presence of reproductive interference from the congener and/or propotency in C. communis to explain our unexpected findings. We should verify potential effects of reproductive interference and propotency in future to elucidate the mystery of prior selfing in this mixed mating species with delayed selfing.

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