Floral Morphology of Populus deltoides and P. tremuloides. Contributions from the Hull Botanical Laboratory 639

Nagaraj, M.

doi:10.1086/335763

Cited by 33 publications

(1 citation statement)

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“…Работы, посвящённые этому вопросу, датируются в основном 30-60 гг. прошлого столетия [17][18][19][20][21][22][23][24][25][26]. В списках апомиктичных видов, родов и семейств последнего времени семейство Salicaceae вообще не указывается [7,8,9].…”

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The Peculiarities of Seeded Reproduction of Some Species of Salix L

Ugolnikova¹,

Кашин²

2012

CBE

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В ходе цитоэмбриологического исследования и исследования семенной продуктивности растений видов рода Salix, произрастающих в различных районах Саратовской области, установлена способность к гаметофитному апомиксису в 8 популяциях 6 видов. Для исследованных видов этот способ размножения отмечен впервые. Ключевые слова: гаметофитный апомиксис, семенная продуктивность популяции, режимы цветения, Salix, цитоэмбриология.

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The Peculiarities of Seeded Reproduction of Some Species of Salix L

Ugolnikova¹,

Кашин²

2012

CBE

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Why are triploid quaking aspen (Populus tremuloides) common?

Blonder

2024

American J of Botany

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PremiseQuaking aspen is a clonal tree species that has mixed ploidy, often with high relative abundance of both diploids and triploids but no haploids or tetraploids. Triploids typically have low fertility, leaving their occurrence apparently unlikely from an evolutionary perspective, unless they provide a “triploid bridge” to generating higher‐fitness tetraploids—which are not observed in this species. This study focused on how triploidy can be maintained in quaking aspen.MethodsA computational model was used to simulate gamete production, sexual reproduction, asexual reproduction, parent survival, and offspring survival in a population. All parameters were assumed to be cytotype‐dependent and environment‐independent. Sampling methods were used to identify parameter combinations consistent with observed cytotype frequencies.ResultsMany processes and parameter values were sufficient to yield a moderate frequency of triploids, and very few were necessary. The most plausible route involved higher triploid survival at the parent or offspring stage and limited unreduced gamete production by either diploid or triploid parents. Triploid fertility was helpful but not necessary.ConclusionsThe coexistence of diploids and triploids in quaking aspen is statistically likely and promoted by the existence of commonly observed, long‐lived triploid clones. However, other mechanisms not captured by the model related to environmental variation could also occur. Further empirical data or more complex but difficult‐to‐parameterize models are needed to gain further insight.

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Floral phenology and morphology of black cottonwood,Populus trichocarpa(Salicaceae)

Boes¹,

Strauss²

1994

American J of Botany

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Seasonal changes in the development of reproductive structures are documented for Populus trichocarpa Torr. and Gray. Buds were collected and studied from several trees for a 2‐yr period, but to maintain a congruous phenology, representative structures from only one male and one female tree are presented. Collected tissues were fixed, dehydrated, embedded in wax, sectioned, and differentially stained. The development of reproductive meristems begins early in the spring, before leaves emerge. However, the anatomy of male and female flowers is virtually indistinguishable until late spring. The structures of the gynoecium develop in about 2 wk, then continue to enlarge through the summer and autumn until the trees become dormant. The unilocular ovary consists of usually three, but sometimes four carples. Stamen development begins in the center of a disk‐shaped meristematic region and proceeds centrifugally. Megasporogenesis and microsporogenesis take place late in the winter, approximately 2 wk before anthesis. Dissection of mature flowers revealed 30–50 seeds per capsule on female trees and 40–60 stamens on male trees. When compared to most other Populus species, P. trichocarpa has a relatively large number of reproductive structures.

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Floral Morphology of Populus deltoides and P. tremuloides. Contributions from the Hull Botanical Laboratory 639

Cited by 33 publications

References 0 publications

The Peculiarities of Seeded Reproduction of Some Species of Salix L

The Peculiarities of Seeded Reproduction of Some Species of Salix L

Why are triploid quaking aspen (Populus tremuloides) common?

Floral phenology and morphology of black cottonwood,Populus trichocarpa(Salicaceae)

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