Estratégias fenológicas de Senna cana (Nees &amp; Mart.) H.S. Irwin &amp; Barneby (Fabaceae: Caesalpinioideae) como mecanismo eficiente para atração de polinizadores

Souza, Isys Mascarenhas; Coutinho, Karoline; Funch, Lígia Silveira

doi:10.1590/s0102-33062012000200019

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…ramosa) were selected as models for the enantiostylous types (ET) based on previous studies (Almeida ; Souza et al . ; Almeida et al . ; de Almeida et al .…”

Section: Methodsmentioning

confidence: 99%

“…When necessary, herbarium material was rehydrated for observation of floral structures. Seven species (Chamaecrista flexuosa, Senna cana, S. macranthera var, pudibunda, S. martiana, C. amiciella, C. repens and C. ramosa) were selected as models for the enantiostylous types (ET) based on previous studies (Almeida 2012;Souza et al 2012;Almeida et al 2013;de Almeida et al 2013;N. M. Almeida, unpublished data).…”

Section: Methodsmentioning

confidence: 99%

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Enantiostylous types of Cassiinae species (Fabaceae‐Caesalpinioideae)

et al. 2015

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Species of the subtribe Cassiinae present a wide diversity of floral types. Until recently it was considered that this diversity did not extend to their reproductive mechanisms. However, studies have recorded some variations in the enantiostylous pattern in this plant group. This study aims to investigate the morphological and functional variations of enantiostyly in species of the subtribe Cassiinae. Additionally, it proposes the recognition of enantiostylous types (ET) based on pollen deposition and capture mode. Morphological data were collected in fresh and fixed (alcohol 70%) buds and flowers, and also using photos and rehydrated material from herbarium sheets, for a total of 59 species. The parameters used to establish the ETs were pollination type, nature of pollen deposition on the pollinator body, deposition type, number of petals involved in pollen deposition, and pollen pathway. Morpho-functional features allowed the recognition of seven enantiostylous types (Flexuosa, Cana, Macranthera, Martiana, Amiciella, Repens and Ramosa) that present several levels of complexity. The type Ramosa was the most common and the Cana type was the least common. The types Repens, Martiana and Flexuosa do not have reciprocal pollen deposition, thus species with these types may be considered atypical. The groups resulting from similarity analysis partially coincide with the clades proposed in phylogenetic studies of Cassiinae. The recognition of functional ETs is important for understanding the evolution of reproductive strategies of Cassiinae species, and indicates an interesting line of investigation of enantiostyly in other plant groups.

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“…ramosa) were selected as models for the enantiostylous types (ET) based on previous studies (Almeida ; Souza et al . ; Almeida et al . ; de Almeida et al .…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Enantiostylous types of Cassiinae species (Fabaceae‐Caesalpinioideae)

et al. 2015

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“…Phenological studies of plants also include identification of the distribution of the resources offered by the flowers in a particular time interval in the ecosystem. This observation is an effective tool to obtain answers about how these mechanisms interact with pollinators (Souza et al, 2012; Freitas et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Phenology, floral and reproductive biology of Dichorisandra rhizantha Aona (Commelinaceae), an endemic endangered species in an Atlantic Forest fragment

JÚNIOR

Souza

Costa

et al. 2023

Microscopy Res & Technique

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Commelinaceae is an important component of the Atlantic Forest and its analysis can provide information on the conservation of that species. This study had the objective of analyzing the phenology and floral and reproductive biology of Dichorisandra rhizantha, growing in an Atlantic Forest fragment, to obtain data related to the form of reproduction and pollination mechanism of this species. We monitored the phenophases and reproductive biology of the D. rhizantha in the area studied using different methodologies and microscopy techniques (LM, SEM and FM). The flowering period occurs during the dry season. The species is andromonoecious and has daytime anthesis (4:30 a.m.-1:30 p.m.). It has purple zygomorphic flowers and rimose but functionally poricidal anthers. The pollen viability was 97.6% and the two floral morphs investigated contained a large quantity of pollen grains. The time of greatest stigma receptivity (anthesis) coincided with the pollen viability. Cross-pollination was the only efficient reproductive system of the species, with observation of gametophytic self-incompatibility and pollen tubes growth only as far as the middle or lower third of the pistil. We observed bee species of the genera Xylocopa and Euglossa visiting the flowers and acting as effective pollinators. The immature fruits were formed after about 3.25 ± 1 days, and the presence was noted of ants of the genus Cephalotes acting as dispersers of the seeds, with aril serving as the reward. Although the natural reproductive system is efficient, D. rhizantha is endangered, mainly due to fragmentation of habitat caused by deforestation and urban encroachment.

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“…is a shrub Fabaceae popularly known as Sao Joao, has occurrence in Cerrado and rupestrian fields, presents yellow flowers, showy, without nectars, and yellow, rigid, porous anthers. S. cana is a little studied species, and this is one reason why there are no specific protocols for its cultivation [1][2].…”

Section: Introductionmentioning

confidence: 99%

Overcoming Dormancy and Influence of Light on the Physiological Quality of Senna cana (Fabaceae) Seeds

Medeiros

Feliciano

Matos

et al. 2019

JEAI

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Environmental factors affect the germination process, like the presence of seed coat and the quality of light; these informations are still scarce for many native species from Brazil, especially for Senna cana, which there are no adequate standards and methodologies to be used in germination tests. The aim of this research was to recommend adequate pre-germinative treatment(s) to overcome seed dormancy, and determine the degree of influence of different light regimes in seed germination of S. cana. Two experiments were carried out: T1-evaluation of different methods of dormancy overcoming (intact seeds (control), T2-imbibition of the intact seeds for 24 hours (in distilled water), T3-scarified seeds with sandpaper n° 100 in the hilum opposite region, T4-scarified seeds with sandpaper n° 100 in the region the hilo opposite region and imbibition in water (in distilled water) for 24 hours; T5-imbibition in water at 80°C); 2-Influence of light quality on seed germination and vigor (white light, red light, far red light and absence of light). The evaluated parameters were: first JEAI, 32(5): 1-9, 2019; Article no.JEAI.47671 2 germination count, percentage of germination, IVG (Germination speed index), MGT (Mean germination time). Treatments were compared by Tukey at 5% probability. The best method for overcoming seed dormancy was mechanical scarification with sandpaper nº 100. The germination of the seeds of S. cana can be classified as indifferent to the luminosity, despite germinative response be greater under white and red light. Original Research Article

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Estratégias fenológicas de Senna cana (Nees & Mart.) H.S. Irwin & Barneby (Fabaceae: Caesalpinioideae) como mecanismo eficiente para atração de polinizadores

Cited by 14 publications

References 25 publications

Enantiostylous types of Cassiinae species (Fabaceae‐Caesalpinioideae)

Enantiostylous types of Cassiinae species (Fabaceae‐Caesalpinioideae)

Phenology, floral and reproductive biology of Dichorisandra rhizantha Aona (Commelinaceae), an endemic endangered species in an Atlantic Forest fragment

Overcoming Dormancy and Influence of Light on the Physiological Quality of Senna cana (Fabaceae) Seeds

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