At the beginning and at the end: Combined mechanisms of prior and delayed self-pollination interact to make a “winner” species

Domingos‐Melo, Arthur; Nadia, Tarcila de Lima; Machado, Isabel Cristina

doi:10.1016/j.flora.2018.09.007

Cited by 4 publications

(5 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In support, Castro et al ( 2008 ) showed that in Polygala vayredae flower longevity varied in response to the abundance of efficient pollinators indicating that increased longevity might maintain the opportunity for cross-pollination and fertilization in this species when pollinators are scarce. However, there are many factors that can influence flower longevity (Ashman and Schoen, 1994 ; Costa and Machado, 2017 ; Domingos-Melo et al, 2018 ; Roddy et al, 2021 ) and further research is required to establish why non-cross-pollinated flowers of S. umbratica remain open for a much longer time than those of K. virginica .…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, floral longevity may be extended when rain reduces pollen viability, thus increasing the probability of pollinators depositing viable pollen on stigmas and securing high seed set (Domingos-Melo et al, 2020 ). In some species, flower wilting or abscission have been shown to trigger DAS to increase seed set in the absence of pollinators or when pollen is limited (Costa and Machado, 2017 ; Domingos-Melo et al, 2018 ). However, if pollinators are present and cross-pollination is completely successful, flower abscission causing termination of DAS might be expected, so as to reduce floral maintenance costs (Ashman and Schoen, 1994 ; Hildesheim et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Occurrence and Prevention of Delayed Autonomous Selfing in Salvia umbratica (Lamiaceae)

et al. 2021

View full text Add to dashboard Cite

Delayed autonomous selfing (DAS) provides reproductive assurance under conditions of pollinator and/or pollen-limitation. Few plant species have been investigated to determine if DAS is terminated when a flower is sufficiently pollinated by a pollen vector, thereby saving plant resources for other purposes. We examined this possibility in bumblebee-pollinated Salvia umbratica. We first showed that DAS resulting in high fruit set (100%) and seed set (>80%) per flower occurred in the absence of insect pollinators by means of style recurvature and was completed in 94% of flowers 72 h after they opened. In contrast, in flowers pollinated immediately after opening, DAS was prevented by corollas dropping away before styles recurve toward the upper thecae. We next showed that hand-pollination of flowers immediately after they opened resulted in high fruit set (100%) and seed set (>80%) when 5–10 pollen grains or more were deposited on their stigmas, whereas fruit set and seed set were reduced to 45.00 and 22.50%, respectively, when pollen loads were reduced to 1–3 pollen grains. Finally, we showed that on average single pollinator visits deposited 26 pollen grains on stigmas of flowers that had just opened, which is more than enough to ensure high fruit and seed set. Our results indicate that flower longevity is highly correlated with the pollinator environment and female fitness of S. umbratica, with extended flower longevity allowing DAS to occur being advantageous when pollinators are absent, while reduced floral longevity and prevention of DAS being favored when flowers are pollinated by pollinators. Thus, flower longevity in S. umbratica varies so as to optimize reproductive output and resource efforts, and is dependent on the availability and effectiveness of pollinators to pollinate flowers.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Occurrence and Prevention of Delayed Autonomous Selfing in Salvia umbratica (Lamiaceae)

et al. 2021

View full text Add to dashboard Cite

show abstract

“…If a Hornstedtia scottiana stigma has not previously been pollinated, the slowly elongated corolla tube finally pushs the pollen onto a fixed, spade‐shaped stigma to complete self‐pollination (Ippolito & Armstrong 1993). Sida cordifolia has a pollination mechanism for self‐pollination before flowering and delayed self‐pollination after flower closure (Domingos‐Melo et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Doubly guaranteed mechanism for pollination and fertilization in Ipomoea purpurea

Liu

Gui²,

Sun

et al. 2020

Plant Biol J

View full text Add to dashboard Cite

• Flowers, the reproductive organs of angiosperms, show a high degree of diversity in morphological structure and flowering habit to ensure pollination and fertilization of the plants. Effect of flower movement on pollination and fertilization was investigated in Ipomoea purpurea (Convolvulaceae) in this study. • Fluorescence microscopy was used to observe the germination of pollen grains at different temperatures. • From 04:00 to 06:00 h, the stigma was taller than the filaments, so that self-pollination could not occur, and cross-pollination was carried out by insects. Pollen grains germinated rapidly after falling on the stigma; the pollen tube reached the ovule to complete fertilization after 2-3 h. From 07:00 to 09:00 h, filaments of two stamens grew rapidly and reached the same height as the stigma, thus allowing self-crossing. But at this time, the ambient temperature was already high and was not conducive to the germination of pollen grains. The corolla closed, forming an inverted bell shape, where the inner microenvironment ensured completion of pollen germination and fertilization. • Preferential cross-pollination and delayed self-crossing of I. purpurea provided a doubly guaranteed mechanism for pollination and fertilization, facilitating its adaptation to a high temperature climate.

show abstract

“…Plants in dry regions may resort to self-pollination in order to ensure reproductive security in response to environmental instabilities (Pedersen & Ehlers 2000;Evans et al 2011;Naghiloo et al 2019). In self-pollinating species, the sequence of anthesis interacts synergistically with floral morphology, often involving complex movements, which favors the arrival of pollen to the receptive stigmas (Lloyd & Schoen 1992;Domingos-Melo et al 2018). This delicate adjustment can be greatly affected by rain, being rare the cases of rain-triggered self-pollination, in which the exposure of flowers to rain takes a beneficial aspect (Hagerup 1950;Daumann 1970;Suetsugu 2019).…”

Section: Short Communicationmentioning

confidence: 99%

“…The high reproductive success by autogamy in dry flowers demonstrates how the mechanism of delayed self-pollination by style curvature is efficient (Ruan et al 2010;Domingos-Melo et al 2018;Goodwillie & Weber 2018). However, the reproductive success by self-pollination in wet flowers was very low.…”

Section: Short Communicationmentioning

confidence: 99%

The dark side of the rain: self-pollination setbacks due to water exposure in Pavonia varians Moric (Malvaceae), a species with rain-dependent flowering

et al. 2020

Self Cite

View full text Add to dashboard Cite

Plants that occur in arid or semi-arid environments may restrict their flowering to the rainy season to ensure water availability for reproductive functions. However, the exposure of flowers to rainfall can compromise their functionality, such as complex self-pollination mechanisms. We experimentally tested how rainfall exposure affects the sequence of anthesis and reproductive success of Pavonia varians. This species is endemic to the Caatinga, and it has a rainfall-dependent flowering and a specialized mechanism of delayed self-pollination by style curvature. Our results demonstrate that wet flowers have difficulty in distending their petals, and although they maintain the sequence of anthesis, style curvature and corolla closure are delayed. Water exposure also compromised reproductive success by spontaneous self-pollination in bagged flowers but did not prevent fruit set by exposed flowers. These conditions allow cross-pollination in P. varians if rainfall is transient or localized, which is a common condition in the Caatinga. We believe that this type of experimental approach can bring important clues about how reproductive systems respond to abiotic factors, especially in the context of imminent climate change.

show abstract

At the beginning and at the end: Combined mechanisms of prior and delayed self-pollination interact to make a “winner” species

Cited by 4 publications

References 49 publications

Occurrence and Prevention of Delayed Autonomous Selfing in Salvia umbratica (Lamiaceae)

Occurrence and Prevention of Delayed Autonomous Selfing in Salvia umbratica (Lamiaceae)

Doubly guaranteed mechanism for pollination and fertilization in Ipomoea purpurea

The dark side of the rain: self-pollination setbacks due to water exposure in Pavonia varians Moric (Malvaceae), a species with rain-dependent flowering

Contact Info

Product

Resources

About