Deciphering the role of reproductive investment, pollination success and predispersal seed predation on reproductive output in<i>Juniperus thurifera</i>

Rodríguez-García, E.; Olano, José Miguel; Leroux, Olivier; Mezquida, Eduardo T.

doi:10.1080/17550874.2018.1549119

Cited by 9 publications

(3 citation statements)

References 74 publications

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“…Literature reports of pollen shedding times for J . thurifera vary from: winter [ 6 ]; flower(s) by January [ 58 ]; flower(s) at the end of winter period [ 59 ]; late winter-early spring [ 60 ], between January and May [ 61 , 62 ].…”

Section: Discussionmentioning

confidence: 99%

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Gene flow between diploid and tetraploid junipers - two contrasting evolutionary pathways in two Juniperus populations

et al. 2020

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Background Gene flow and polyploidy have been found to be important in Juniperus evolution. However, little evidence has been published elucidating the association of both phenomena in juniper taxa in the wild. Two main areas were studied in Spain (Eastern Iberian Range and Sierra de Baza) with both diploid and tetraploid taxa present in sympatry. Gene flow and ploidy level were assessed for these taxa and the resulted offspring. Results Twenty-two allo-triploid hybrids between J. sabina var. sabina and J. thurifera were found in the Eastern Iberian Range population. However, in the Sierra de Baza population no triploids were found. Instead, 18 allo-tetraploid hybrids between two tetraploid taxa: J. sabina var. balkanensis and J. thurifera were discovered. High genetic diversity was exhibited among the tetraploid hybrids at Sierra de Baza, in contrast to the genetically identical triploid hybrids at the Eastern Iberian Range; this suggests meiotic difficulties within the triploid hybrids. In addition, unidirectional gene flow was observed in both studied areas. Conclusion Polyploidy and hybridization can be complementary partners in the evolution of Juniperus taxa in sympatric occurrences. Juniperus was shown to be an ideal coniferous model to study these two phenomena, independently or in concert.

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Section: Discussionmentioning

confidence: 99%

“…Wind data from city of Baza, Spain [ 63 ]. Times of receptive cones are highly correlated with pollen shedding (time) in Juniperus [ 60 ]. na = not applicable.…”

Section: Discussionmentioning

confidence: 99%

Gene flow between diploid and tetraploid junipers - two contrasting evolutionary pathways in two Juniperus populations

et al. 2020

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“…However, too much fruit and seed production can lead to a reduction in nutrients allocated to each fruit [24,25], which goes against the optimal resource allocation of heredity, i.e., the fitness of offspring is limited [26,27]. This status may be more significant when environmental resources are restricted [28]. Therefore, there is a trade-off between the production of female flowers and the production of single fruits or seeds.…”

Section: Introductionmentioning

confidence: 99%

The Patterns of Male and Female Flowers in Flowering Stage May Not Be Optimal Resource Allocation for Fruit and Seed Growth

Gao

et al. 2021

Plants

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Changes in the proportions of male and female flowers in monoecious plants in response to external environmental conditions are directly related to the reproductive fitness of plants. The monoecious cucumber (Cucumber sativus) plant was used in this study to assess the responses of sex differentiation and the breeding process to nutrient supply and the degree of artificial pollination using pollen solutions of different concentrations. We found that the nutrient supply significantly improved the number of female flowers, while pollination treatments did not obviously increase the number of male flowers. Continuous pollination changed the number of female flowers especially in the later stage of the pollination experiment. Therefore, pollination changed the ratio of male and female flowers in the flowering stage of cucumber. Pollination treatment affected the fruit growth, seed set, and fruit yield. The number of fruit, fruit set percentage, and total seeds per plant did not increase with the pollination level, but individual fruit weight and seed number in one fruit did increase. The differentiation of male and female flowers in the flowering stage of cucumber is a response to nutrient and pollination resources, but this response is not the optimal resource allocation for subsequent fruit development and seed maturity, which suggests that the response of plants to external environment resources is short-term and direct.

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Pollination and floral insect visitors of non-native Crataegus monogyna Jacq and Crataegus mexicana DC (Rosaceae) in the Eastern Cape Province, South Africa

Tshilingalinga,

Heshula,

Forbanka

et al. 2023

Arthropod-Plant Interactions

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Crataegus species (Rosaceae) or hawthorns form dense thickets and displace native vegetation out of their native range. In South Africa, Crataegus monogyna and C. mexicana are under surveillance but there is lack of information on their pollination ecology. Therefore, this study sought to investigate the pollination mechanism and potential insect pollinators of these plants. Pollinator exclusion experiments were conducted on ten plants each of C. monogyna and C. mexicana near the towns of Hogsback and Seymour respectively, in the Eastern Cape Province. Flowers of each of these species were also observed to determine the diversity and distribution of insect visitors throughout the day (i.e. morning, mid day and afternoon). The results showed that C. monogyna and C. mexicana are capable of self and cross-pollination. Fruit set from open inflorescences of C. monogyna was 40.88 ± 0.08%, significantly higher than bagged inflorences. Fruit set from open inflorescences of C. mexicana was 48.18 ± 0.03%, significantly higher than those of bagged inflorescences. Hymenopterans were the most frequent visitors on C. monogyna flowers while dipterans were the most frequent visitors on C. mexicana flowers. The distribution of insects did not vary with the time of day for each plant species. Insect pollination, therefore, plays a significant role in the fruiting of C. monogyna and C. mexicana in the Eastern Cape. The results of this study contribute to the understanding of the ecology and phenology of Crataegus species in South Africa and thus the evaluation of their invasive status.

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Deciphering the role of reproductive investment, pollination success and predispersal seed predation on reproductive output inJuniperus thurifera

Cited by 9 publications

References 74 publications

Gene flow between diploid and tetraploid junipers - two contrasting evolutionary pathways in two Juniperus populations

Gene flow between diploid and tetraploid junipers - two contrasting evolutionary pathways in two Juniperus populations

The Patterns of Male and Female Flowers in Flowering Stage May Not Be Optimal Resource Allocation for Fruit and Seed Growth

Pollination and floral insect visitors of non-native Crataegus monogyna Jacq and Crataegus mexicana DC (Rosaceae) in the Eastern Cape Province, South Africa

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