Comparative Anatomy and Morphology of Nectar-producing Melastomataceae

Varassin, Isabela Galarda; Penneys, Darin S.; Michelangeli, Fabián A.

doi:10.1093/aob/mcn180

Cited by 53 publications

(52 citation statements)

References 44 publications

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“…In cold-stressed rice anthers, expression was found in guard cells that are located on the connective tissue of rice anthers. Stomata in anthers could play a role in pollen dehiscence in entomophilous plants, where they are associated with nectaries and play a role in sugar secretion (Keijzer et al, 1987(Keijzer et al, , 1996Varassin et al, 2008). The role of these stomata in the selffertilizing plant species rice is unclear, but also Arabidopsis was shown to have functional nectaries (Kram and Carter, 2009).…”

Section: Discussionmentioning

confidence: 99%

Control of Abscisic Acid Catabolism and Abscisic Acid Homeostasis Is Important for Reproductive Stage Stress Tolerance in Cereals1

et al. 2011

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Drought stress at the reproductive stage causes pollen sterility and grain loss in wheat (Triticum aestivum). Drought stress induces abscisic acid (ABA) biosynthesis genes in anthers and ABA accumulation in spikes of drought-sensitive wheat varieties. In contrast, drought-tolerant wheat accumulates lower ABA levels, which correlates with lower ABA biosynthesis and higher ABA catabolic gene expression (ABA 8#-hydroxylase). Wheat TaABA8#OH1 deletion lines accumulate higher spike ABA levels and are more drought sensitive. ABA treatment of the spike mimics the effect of drought, causing high levels of sterility. ABA treatment represses the anther cell wall invertase gene TaIVR1, and drought-tolerant lines appeared to be more sensitive to the effect of ABA. Drought-induced sterility shows similarity to cold-induced sterility in rice (Oryza sativa). In coldstressed rice, the rate of ABA accumulation was similar in cold-sensitive and cold-tolerant lines during the first 8 h of cold treatment, but in the tolerant line, ABA catabolism reduced ABA levels between 8 and 16 h of cold treatment. The ABA biosynthesis gene encoding 9-cis-epoxycarotenoid dioxygenase in anthers is mainly expressed in parenchyma cells surrounding the vascular bundle of the anther. Transgenic rice lines expressing the wheat TaABA8#OH1 gene under the control of the OsG6B tapetum-specific promoter resulted in reduced anther ABA levels under cold conditions. The transgenic lines showed that anther sink strength (OsINV4) was maintained under cold conditions and that this correlated with improved cold stress tolerance. Our data indicate that ABA and ABA 8#-hydroxylase play an important role in controlling anther ABA homeostasis and reproductive stage abiotic stress tolerance in cereals.

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Section: Discussionmentioning

confidence: 99%

Control of Abscisic Acid Catabolism and Abscisic Acid Homeostasis Is Important for Reproductive Stage Stress Tolerance in Cereals1

et al. 2011

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“…O néctar em Melastomataceae é secretado por estômatos modifi cados presentes na epiderme dos estames (antera, apêndice ou conectivo), no hipanto ou no ápice do ovário (Varassin et al 2008). A presença de nectários na família provavelmente é uma característica derivada, uma vez que espécies do mesmo grupo taxonômico, como as da tribo Blakeeae, apresentam nectários semelhantes (Varassin et al 2008).…”

Section: Discussionunclassified

“…A presença de nectários na família provavelmente é uma característica derivada, uma vez que espécies do mesmo grupo taxonômico, como as da tribo Blakeeae, apresentam nectários semelhantes (Varassin et al 2008). Se confi rmada essa hipótese, M. angelana deve apresentar nectários no ápice do ovário como em M. hyemalis, já que ambas pertencem ao grupo de espécies da seção Cremanium que ocorrem no Sudeste brasileiro (Goldenberg et al 2008, Varassin et al 2008. Estudos anatômicos serão importantes para comprovar tais características.…”

Section: Discussionunclassified

“…O odor forte e desagradável e a quantidade de moscas nas fl ores de M. angelana pode ser indício de polinização por esses insetos, o que foi relatado anteriormente apenas para M. pepericarpa (Goldenberg & Shepherd 1998) e M. hyemalis (Varassin et al 2008), aparentemente com as mesmas características reprodutivas e morfológicas mencionadas para M. angelana.…”

Section: Discussionunclassified

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Biologia reprodutiva de Miconia angelana (Melastomataceae), endêmica da Serra da Canastra, Minas Gerais

Santos¹,

Romero²,

Oliveira³

2010

Rev. bras. Bot.

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− (Reproductive biology of Miconia angelana (Melastomataceae), endemic from Serra da Canastra, Minas Gerais). The reproductive biology of M. angelana R. Romero & R. Goldenberg was studied by controlled hand pollinations, pollen viability, pollen tube growth and seed germination. Miconia angelana fl owered in late October and early November, presented self-compatibity and was independent of buzz pollination. The autogamy, facilitated by the two large pores of the anthers and stamens symmetrically disposed around the style, was responsible for the high fruit-set (91.5%) and high seed germination (92%). Miconia angelana is one of the fi ve species of Melastomataceae reported for autogamy and one of the fi ve of the Miconia genus with nectar production that, together with the awkward odor exhaled by the fl owers, makes possible a higher variety of fl oral visitors as moths, wasps, fl ies, ants, beetles and bees with vibratory behavior or not.Key words -endemism, Melastomataceae, Miconia angelana, nectar RESUMO − (Biologia reprodutiva de Miconia angelana (Melastomataceae), endêmica da Serra da Canastra, Minas Gerais). A biologia reprodutiva de M. angelana R. Romero & R. Goldenberg foi estudada por meio de polinizações controladas, viabilidade polínica, crescimento do tubo polínico e germinação de sementes. Miconia angelana fl oresce entre o fi nal de outubro e o início de novembro, é autocompatível e independente de polinização vibrátil. A autogamia, facilitada pela presença de anteras com dois poros que facilitam a saída do pólen sem que haja vibração e estames dispostos simetricamente ao redor do estilete, foi responsável pelas maiores porcentagens de frutifi cação (91,5%) e germinação das sementes (92%). Miconia angelana é uma das cinco espécies de Melastomataceae conhecidas até o momento que apresenta frutifi cação a partir de autopolinização espontânea e uma das cinco espécies do gênero Miconia com produção de néctar, que juntamente com o odor desagradável das fl ores, possibilita uma maior variedade de visitantes fl orais como mariposas, vespas, moscas, formigas, besouros e abelhas com comportamento vibratório ou não.Palavras-chave -endemismo, Melastomataceae, Miconia angelana, néctar 1.Parte da dissertação de mestrado da primeira autora, Programa de

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“…The birds are attracted to the large, pendant, scarlet-red flowers that produce a copious nectar reward with a low sugar concentration (Snow & Snow, 1980). In a survey of nectariferous Neotropical melastomes, Varassin et al (2008) discovered that H. calyptrata and H. ecuadorensis Wurdack possess nectary stomata on the dorsal surface of the anther connective appendage. They found similar structures in the hummingbird pollinated, Blakea fuchsioides Almeda, and the rodent pollinated B. chlorantha Almeda (Lumer, 1980).…”

Section: Charactersmentioning

confidence: 99%

New species of Chalybea and Huilaea (Melastomataceae)

Puentes

Penneys

2010

Brittonia

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One new species each is proposed in Chalybea and Huilaea (Melastomataceae: Blakeeae). Chalybea peruviana has elliptic, 5-plinerved leaves with entire, revolute margins, inflorescences with 33-39 flowers, and is endemic to Peru. Huilaea calyptrata has inflorescences with 15-17, irregularly calyptrate flowers, anthers with a warty connective in the shape of an inverted hand fan, and is endemic to Ecuador. A key to the eight species of Huilaea is provided.

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Comparative Anatomy and Morphology of Nectar-producing Melastomataceae

Cited by 53 publications

References 44 publications

Control of Abscisic Acid Catabolism and Abscisic Acid Homeostasis Is Important for Reproductive Stage Stress Tolerance in Cereals1

Control of Abscisic Acid Catabolism and Abscisic Acid Homeostasis Is Important for Reproductive Stage Stress Tolerance in Cereals1

Biologia reprodutiva de Miconia angelana (Melastomataceae), endêmica da Serra da Canastra, Minas Gerais

New species of Chalybea and Huilaea (Melastomataceae)

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