Staminode of Jacaranda rugosa A.H. Gentry (Bignoniaceae) promotes functional specialization by ensuring signaling and mechanical fit to medium-sized bees

Pontes, Cristina Adriane de Souza; Domingos‐Melo, Arthur; Milet‐Pinheiro, Paulo; Navarro, Daniela Maria do Amaral Ferraz; Nadia, Tarcila de Lima; Machado, Isabel Cristina

doi:10.1007/s13127-022-00558-8

Cited by 5 publications

(5 citation statements)

References 98 publications

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“…A double function as signal and mechanical fit to pollinating bees has been shown for the staminode of Jacaranda rugosa (de Souza Pontes et al . 2022). Among zygomorphic flowers, the anther and stamen mimics are mostly displayed in the upper part of the flower in the case of sternotribic pollination (e.g.…”

Section: Diversity Of Pollen Anther Stamen and Androecium And Their M...mentioning

confidence: 99%

Pollen, anther, stamen, and androecium mimicry

Lunau,

De Camargo,

Brito

2024

Plant Biol J

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Floral colours represent a highly diverse communication signal mainly involved in flower visitors' attraction and guidance, but also flower discrimination, filtering non‐pollinators and discouraging floral antagonists. The divergent visual systems and colour preferences of flower visitors, as well as the necessity of cues for flower detection and discrimination, foster the diversity of floral colours and colour patterns. Despite the bewildering diversity of floral colour patterns, a recurrent component is a yellow UV‐absorbing floral centre, and it is still not clear why this pattern is so frequent in angiosperms. The pollen, anther, stamen, and androecium mimicry (PASAM) hypothesis suggests that the system composed of the flowers possessing such yellow UV‐absorbing floral reproductive structures, the flowers displaying central yellow UV‐absorbing structures as floral guides, and the pollen‐collecting, as well as pollen‐eating, flower visitors responding to such signals constitute the world's most speciose mimicry system. In this review, we call the attention of researchers to some hypothetical PASAM systems around the globe, presenting some fascinating examples that illustrate their huge diversity. We will also present new and published data on pollen‐eating and pollen‐collecting pollinators' responses to PASAM structures supporting the PASAM hypothesis and will discuss how widespread these systems are around the globe. Ultimately, our goal is to promote the idea that PASAM is a plausible first approach to understanding floral colour patterns in angiosperms.

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Section: Diversity Of Pollen Anther Stamen and Androecium And Their M...mentioning

confidence: 99%

Pollen, anther, stamen, and androecium mimicry

Lunau,

De Camargo,

Brito

2024

Plant Biol J

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“…trees, which are among the most abundant species in Los Angeles ( 36 ), were in bloom during the aircraft observations. Monoterpene emissions during bloom can be up to an order of magnitude higher than usual ( 37 , 38 ), and jacaranda flowers have been shown to emit a bouquet that includes monoterpenes and is rich in sesquiterpenes ( 39 , 40 ). Another factor that can substantially increase biogenic terpenoid emissions and is not part of inventories is heat or drought stress ( 41 , 42 ).…”

Section: Monoterpene Sources: Biogenic or Anthropogenic?mentioning

confidence: 99%

“…Point density Point density (39,40). Another factor that can substantially increase biogenic terpenoid emissions and is not part of inventories is heat or drought stress (41,42).…”

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confidence: 99%

Temperature-dependent emissions dominate aerosol and ozone formation in Los Angeles

Pfannerstill,

Arata,

Zhu

et al. 2024

Science

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Despite declines in transportation emissions, urban North America and Europe still face unhealthy air pollution levels. This has challenged conventional understanding of the sources of their volatile organic compound (VOC) precursors. Using airborne flux measurements to map emissions of a wide range of VOCs, we demonstrate that biogenic terpenoid emissions contribute ~60% of emitted VOC OH reactivity, ozone, and secondary organic aerosol formation potential in summertime Los Angeles and that this contribution strongly increases with temperature. This implies that control of nitrogen oxides is key to reducing ozone formation in Los Angeles. We also show some anthropogenic VOC emissions increase with temperature, which is an effect not represented in current inventories. Air pollution mitigation efforts must consider that climate warming will strongly change emission amounts and composition.

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“…The roles of staminodes in flowering plants are many; they may be associated with nectar production, holding, cover or visual cues, for example (Endress & Matthews, 2006). They can also filter insects for pollination (Pontes et al., 2022; Wang et al., 2019). The fate of these stamens that have lost the function of pollen production may depend on whether they assume new functions; their main function is the prevention of self‐pollination in magnoliid‐type flowers, although some also attract pollinators with signals and rewards (Walker‐Larsen & Harder, 2000).…”

Section: Introductionmentioning

confidence: 99%

Dillenia (Dilleniaceae) pollen heteromorphy and presentation, and implications for pollination by bats

Petit,

Scanlon,

Naikatini

et al. 2024

Ecology and Evolution

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Bat pollination of Dillenia in Fiji, a genus that was presumed to be pollinated by bees, posits that other Dillenia species may be bat‐pollinated, with implications for conservation and the understanding of angiosperm evolution. Botanical descriptions of some corolla behaviours (‘falling as a whole’) suggest bat removal of permanently closed corollas, as in D. biflora. Considering the remoteness of species of interest, we reviewed some Dillenia floral traits to hypothesise what they may mean for bat pollination of the genus. We investigated D. biflora pollen grains apertures and reviewed Dillenia literature concerning corolla behaviour and colour, and pollen apertures and presentation, including pores and staminodes. Our samples had dramatically different ratios of tricolpate to tetracolpate pollen grains, a trait that does not exclude pollination by bees. Petal colour polymorphism occurs, with mixed colours proportionately less common in flowers with corollas that open. The proportion of species with staminodes did not differ between those presumed to be pollinated by bats and others, but anthers of the former were significantly more likely to have apical pores, and stamens all had similar length or were slightly longer in the middle, whereas stamens in two distinct groups occurred in 55% of bee‐pollinated species. Pollen heteromorphy may facilitate pollination by different taxa in tropical environments. However, anther apical pores and stamen uniformity are more likely to be associated with bat‐pollinated species than are other morphologies. Dillenia could be a useful model to examine evolutionary aspects of colour, heteranthery, staminodes and pollen heteromorphy. Only field work will verify bat pollination and the implications of bat dependence for Dillenia species.

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Staminode of Jacaranda rugosa A.H. Gentry (Bignoniaceae) promotes functional specialization by ensuring signaling and mechanical fit to medium-sized bees

Cited by 5 publications

References 98 publications

Pollen, anther, stamen, and androecium mimicry

Pollen, anther, stamen, and androecium mimicry

Temperature-dependent emissions dominate aerosol and ozone formation in Los Angeles

Dillenia (Dilleniaceae) pollen heteromorphy and presentation, and implications for pollination by bats

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