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Pollinator-mediated self-pollination and reproductive assurance in an isolated tree of Magnolia grandiflora L.

Ecological Processes 2020年第1期9卷 517-525页

作者： Arun Sukumaran Vinod Prasad Khanduri Chandra Mohan Sharma College of Forestry VCSG Uttarakhand University of Horticulture and ForestryRanichauriTehri GarhwalUttarakhand 249199India

Background:The ability to produce seeds when pollinators or potential mates are scarce is one of the principal advantages of self-pollination in flowering ***,the role of pollinators mediating self-pollination to ensure seed set when pollen or potential mates are limited has received less *** study examined the reproductive consequences and involvement of pollinators in assuring seed set in an isolated tree of Magnolia grandiflora,a predominantly outcrossing ***:We tested various aspects of reproduction such as flower density,floral rewards,stigma receptivity,pollinator abundance and behaviour,fruit set and seed set,in two successive reproductive years(2015-2016).Results:Flowers of *** possess a suite of traits facilitating pollinator-mediated self-pollination(PMS),although the chances of autonomous self-pollination are reduced due to herkogamy,spatial separation of anther and *** mean pollen production/flower was 5,152,289±285,094 with a pollen-to-ovule ratio of 39430±*** found a significant positive correlation between number of visits and seed production for bees(r=0.5099,p=0.0007)and beetles(r=0.7159,p=0.00001),indicating these are effective at *** was a significant negative correlation for thrips(r=-0.3206,p=0.044)and no correlation for flies or *** percent fruit set was 100%and the seed set per ovule ranged between 19 and 20%.Conclusions:PMS will guarantee reproductive assurance and mitigate the effect of reduced mates or pollen limitation which is expected to increase the fecundity and establishment of individual trees in geographically isolated locations.

关键词： Pollinator-mediated self-pollination Magnolia grandiflora Autonomous self-pollination Pollinator behaviour reproductive assurance

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What ecological factors favor the shift from distyly to homostyly? A study from the perspective of reproductive assurance

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Journal of Plant Ecology 2018年第4期11卷 645-655页

作者： Xian-Feng Jiang Xing-Fu Zhu Ling-Ling Chen Qing-Jun Li Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMengla 666303China University of Chinese Academy of Sciences Beijing 10049China Laboratory of Ecology and Evolutionary Biology State Key Laboratory in Conservation and Utilization of Bioresources in YunnanYunnan UniversityKunmingYunnan 650091China

Aims Distyly is one of the most widespread floral polymorphisms pro-moting *** transition from obligate cross-fertilized distyly to predominantly self-fertilized homostyly is frequently documented in various ***,empirical stud-ies concerning the ecological factors connected with this transition are still *** chungensis,suggested to be evolving from distyly to homostyly,provides an ideal model for the study of the ecological factors concerned with this *** study ***-gensis to understand if autonomous self-fertilization would provide reproductive assurance for the self-fertilized homo-styled morph in the *** the incompatibility features of *** were tested with hand-pollination *** compared the capacity of autonomous self-fertilization between the distylous and homo-styled morph of *** in the field by excluding the pollinators with *** addition,the degrees of herkogamy of some *** plants were between the short-styled and homo-styled *** plants were studied to understand whether they were able to obtain greater reproductive assurance when the herkogamy in the flowers was *** Findings All three morphs of *** were highly self-and intra-morph *** degree of herkogamy positively correlated with the capacity for autonomous self-fertilization.A negative correlation between the degree of herkogamy and the magnitude of pollen limitation was found,but no significant correlation was found between the degree of herkogamy and the contribution of cross-fertilization to overall *** study suggests that reducing the degree of herkogamy can significantly increase the reproductive assurance for a self-compatible *** results provided evidence that the homo-styled morph of *** had the highest capacity for autonomous self-fertilization and the highest seed production in the field,because autonomous self-f

关键词： autonomous self-fertilization dimorphic incompatibility distyly homostyly Primula chungensis reciprocal herkogamy reproductive assurance

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Differences in floral traits and flower visitation rates in mating systems in Prunella vulgaris(Lamiaceae)

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Journal of Plant Ecology 2022年第1期15卷 39-56页

作者： Tial C.Ling Lin-Lin Wang Yong-Ping Yang Yuan-Wen Duan CAS Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Institute of Tibetan Plateau Research at Kunming Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina University of the Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun 666303China

Floral traits and the number of visitors are expected to change with different mating *** tested this hypothesis by comparing flowers of Prunella vulgaris(Lamiaceae)with inserted and exserted styles across a strongly exserted style biased,an exserted style biased,and a strongly inserted style biased subalpine *** examined flowering phenology,floral morphology,flower visitation rate,capacity for autonomous selfpollination and visitor contribution to seed production for each style type and in each *** also examined inbreeding depression(ID)by comparing the relative performance of progeny from self-and *** style plants had larger and more open flowers,increased pollen production,higher amounts of nectar rewards and higher visitation and outcrossing rates than inserted style *** on the population level,the visitation rates were higher in the exserted style-biased populations than in the inserted style-biased *** style plants provided a stronger reproductive assurance(RA)through autonomous selfing than exserted style *** and outcrossing rates did not differ among populations,showing low visitation rates may be sufficient for adequate seed production in *** inserted style plants had a lower ID level than exserted style plants,the ID of both was less than 0.5,suggesting that an ID should not counteract the evolution of selfing in this *** style plants provide RA through autonomous selfing,and exserted style plants ensure outcrossing through pollinator services,supporting a stable mixed mating system in this subalpine plant.

关键词： autonomous selfing floral traits inbreeding depression visitors Prunella vulgaris reproductive assurance

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Potential Autonomous Selfing in Gesneria citrina (Gesneriaceae),a Specialized Hummingbird Pollinated Species with Variable Expression of Herkogamy

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Journal of Integrative Plant Biology 2009年第10期51卷 973-978页

作者： Xin-Sheng Chen Silvana Marten-Rodriguez Qing-Jun Li Charles B. Fenster Xishuangbanna Tropical Botanical Garden the Chinese Academy of Sciences Mengla 666303 China Department of Biology University of Maryland College Park MD 20742 USA Herbario de la Universidad de Costa Rica Escuela de Biologia Ciudad Universitaria Rodrigo Facio San Pedro San Jose Costa Rica

Species with mixed mating systems often demonstrate variable expression of breeding system characteristics and thus represent the opportunity to understand the factors and mechanisms that promote both outcrossed and selfed seed production. Here, we investigate variation in levels of herkogamy （variation in stigma-anther separation distance） in a Puerto Rican population of hummingbird pollinated Gesneria citrina Urban. There is significant variation in herkogamy levels among individuals of this species and stigma-anther separation is negatively associated with the ability to set fruits and seeds in the absence of pollinators. The variation in levels of herkogamy may represent a mechanism to ensure the production of some self-fertilized progeny in the absence of hummingbird pollinators. We also describe a novel breeding system in G. citrina, where stamens elongate over time to reach stigma height, but stamen elongation is accelerated by pollination. These results suggest that once the flowers are pollinated, stamen elongation may favor increased pollen removal and siring success, while the reduction in stigma-anther distance no longer imposes the risk of interference between male and female functions. We discuss our findings of breeding system variation in the context of pollination system evolution in an island setting （Antillean islands）.

关键词： mixed-mating pollen limitation pollination system Puerto Rico reproductive assurance stigma-anther separation.

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