Pollination biology and breeding system analysis of <i>Ulmus wallichiana</i> Planchon (Ulmaceae), a rare and threatened tree species of Central and Western Himalaya

Roy, Sudip Kumar; Khanduri, Priyanka; Bhatnagar, A. K.; Pandey, Arun K.

doi:10.1111/njb.02976

Cited by 2 publications

(1 citation statement)

References 78 publications

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“…Second, following Ramírez and Nassar [88], we estimated a widely used incompatibility index per plant based on a relative measure of reproductive output following self-and cross-pollinations with the modi ed equation S4). These numbers are well within the range used to estimate SI indexes in other systems [e.g., 22,89,90,91]…”

Section: Data Collectionsupporting

confidence: 58%

Newly discovered differences of reproductive traits between island and mainland plants support Baker’s law

Keller,

Alther,

Jiménez

et al. 2023

Preprint

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Background: Reproduction in angiosperms involves either one or two parents, through which selfed/cloned or outcrossed progeny is formed, respectively. Uniparental reproduction is advantageous when lack of mates and/or pollinators limits outcrossing opportunities. Baker’s law predicts that the capacity for uniparental reproduction should be enriched in habitats colonized via long-distance dispersal, such as volcanic islands. To test Baker’s law, we quantified variation of reproductive traits at multiple hierarchical levels and compared seed set after selfing and crossing experiments in both island and mainland populations of Limonium lobatum, a widespread species that Baker described as self-incompatible based on observations of stigma-pollen dimorphism in their flowers. In species with the type of pollen-stigma dimorphism that Baker detected in L. lobatum, pollen of one floral morph typically cannot fertilize ovules of the same floral morph. Results: We discovered new variation and combinations of pollen-stigma traits never described before and determined that plants with such novel combinations were more common in island than mainland populations. We also documented, for the first time, a lack of correspondence between specific pollen-stigma combinations and pollen compatibility. Furthermore, the results of manual pollination experiments established that selfed seed-set was higher in island than mainland plants, while outcrossed seed-set was lower in island than mainland plants. Overall, more than 80% of all plants were self-compatible, while less than 20% were partially or entirely self-incompatible. Conclusions: Contrary to previous descriptions by Baker, L. lobatumis a species that includes both self-compatible and self-incompatible plants characterized by both known and previously undescribed combinations of pollen-stigma traits. This type of variation was previously unknown in Plumbaginaceae and the lack of correspondence between pollen-stigma combinations was never described outside the highly variable species complex of Armeria maritima. Furthermore, island populations of L. lobatum harbor more plants with the newly discovered pollen-stigma combinations than mainland populations and are enriched in their capability for uniparental reproduction, corroborating Baker’s law. Our study establishes a link between variability of reproductive traits and capability of uniparental reproduction on islands, connecting research on reproductive and island biology.

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Section: Data Collectionsupporting

confidence: 58%

Newly discovered differences of reproductive traits between island and mainland plants support Baker’s law

Keller,

Alther,

Jiménez

et al. 2023

Preprint

View full text Add to dashboard Cite

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Reproductive biology of Acer caesium Wall. ex Brandis (Sapindaceae): a dioecious tree species from Northwestern Himalayas

Roy,

Khanduri,

Bhatnagar

et al. 2023

Preprint

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Acer caesium, commonly known as Himalayan maple, is a tree species endemic to Central and Western Himalaya. This multipurpose tree species has undergone a decline in its natural population number due to overexploitation over the years. Any attempts for conservation of this species will require understanding its reproductive behaviour in natural ecosystems. However, there is hardly any information on pollination ecology of this species. To bridge this gap, we studied the floral biology and pollination ecology in natural populations growing at Kedarnath Wildlife Sanctuary, Uttarakhand, India. In addition, whether the species is experiencing any pollen limitation was examined using hand-pollination experiments. A. caesium is a dioecious tree species with male biased sex ratio in the studied populations. Both male and female flowers exhibit typical characters of a wind pollinated plant. Interestingly, pollination experiments revealed ambophily in the species, with wind as the primary means of pollination and a small percentage of fruit set through insects. Pollen limitation experiments showed that natural fruit set in A. ceasium is pollen limited as pollen supplementation augmented the fruit set. The probable reason for low fruit set in natural pollination conditions seems to be sparse distribution of the male plants around female plants in the population. Thus, for optimal conservation efforts, it is recommended that spatial structure of male and female individuals in the population must be considered for better outcrossing opportunities.

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Pollination biology and breeding system analysis of Ulmus wallichiana Planchon (Ulmaceae), a rare and threatened tree species of Central and Western Himalaya

Cited by 2 publications

References 78 publications

Newly discovered differences of reproductive traits between island and mainland plants support Baker’s law

Newly discovered differences of reproductive traits between island and mainland plants support Baker’s law

Reproductive biology of Acer caesium Wall. ex Brandis (Sapindaceae): a dioecious tree species from Northwestern Himalayas

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