What are Backshoots Good For? Seasonal Changes in Mineral, Carbohydrate and Water Content of Different Organs of the Epiphytic Orchid, Dimerandra emarginata

Zotz, Gerhard

doi:10.1006/anbo.1999.0983

Cited by 43 publications

(41 citation statements)

References 28 publications

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“…The diameter of the roots of the terrestrial Orchidaceae is wider than that of the epiphytic ones. This characteristic can be associated with the storage of nutritive substances and water (Zots, 1999). Habenaria roots have the smallest diameter when compared to the other species, at least in terms of absorption roots.…”

Section: Discussionmentioning

confidence: 99%

Comparative anatomy of the absorption roots of terrestrial and epiphytic orchids

Moreira

Isaías

2008

Braz. arch. biol. technol.

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Section: Discussionmentioning

confidence: 99%

Comparative anatomy of the absorption roots of terrestrial and epiphytic orchids

Moreira

Isaías

2008

Braz. arch. biol. technol.

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“…On the other hand, however, the average N:P ratios of mature leaves of 41 epiphyte species compiled from a number of papers did not appear particularly high (12.1 ± 10.5, cf. Zotz & Hietz 2001 (Benzing & Davidson 1979, Zotz 1999, while virtually no attention has been given to nutrient retention before the abscission of plant organs. This neglect is surprising, because résorption of nutrients before leaf abscission is a keystone process in plant nutrient relations in most, if not all, ecosystems (Killingbeck 1996).…”

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confidence: 99%

The resorption of phosphorus is greater than that of nitrogen in senescing leaves of vascular epiphytes from lowland Panama

Zotz

2004

J. Trop. Ecol.

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The epiphytic habitat is assumed to be nutrient deficient, although this generally held notion is based almost completely on circumstantial evidence (Zotz & Hietz 2001). Most studies on the nutrient relations of vascular epiphytes focus on nitrogen (Bergstrom & Tweedie 1998, Hietz & Wanek 2003, Stewart et al. 1995). Although nitrogen plays a key role in limiting plant growth worldwide, there is an on-going discussion whether nitrogen or rather phosphorus are more limiting in many tropical forests (Grubb 1989, Harrington et al. 2001, Vitousek & Howarth 1991). To identify which nutritional factor is most limiting for plant growth, nutrient ratios have been proposed as a very useful tool (Koerselman & Meuleman 1996). These authors stated that N:P ratios exceeding 16 are indicative of P limitation, while an N:P ratio <14 suggests N limitation. Some reports of such ratios in the epiphyte literature indicate that phosphorus may indeed be limiting for epiphytes in tropical forests. For example, the N:P ratio of two field-grown bromeliads (Tillandsia circinnata and T. usneoides) decreased dramatically from 23.6 and 40.4, respectively, to 3.6 and 3.4, respectively, when fertilized with both N and P in the laboratory (Benzing & Renfrow 1974a). On the other hand, however, the average N:P ratios of mature leaves of 41 epiphyte species compiled from a number of papers did not appear particularly high (12.1±10.5, cf. Zotz & Hietz 2001).

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“…However, few studies analyzed the patterns of RA for plants occurring in tree canopies (Benzing 1990). The available data reveal that 4-25% of biomass, 7-33% of nitrogen and 12-58% of phosphorous is invested in maturing fruits of three epiphytic orchids and one epiphytic bromeliad (Benzing & Ott 1981;Zotz 1999;2000). These values can exceed the RA of terrestrial perennial plants and approximate the RA of annual ones.…”

Section: Discussionmentioning

confidence: 99%

“…The available information on epiphytes deals with infruitescences of one bromeliad and two orchids (Benzing 1990;Zotz 1999). In relation to size dependence, only Zotz (2000) evaluated the variation of RA of an epiphytic plant, Dimerandra emarginata (G. Meyer) Hoehne according to distinct sizes.…”

Section: Introductionmentioning

confidence: 99%

Size-dependent allocation of biomass to ancillary versus flowers of the inflorescences of the epiphyte Tillandsia stricta Soland (Bromeliaceae)

Mantovani

Iglesias

2009

Acta Bot. Bras.

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RESUMO -(Influência do tamanho do corpo na alocação de biomassa em estruturas de suporte e flores da bromélia epífita Tillandsia stricta Soland. (Bromeliaceae)). A quantidade de recursos investidos na reprodução sexuada em geral é positivamente correlacionada à quantidade dos mesmos recursos investidos no corpo vegetativo da planta; porém nem sempre de forma proporcional. A proporção dos recursos da planta alocados na reprodução sexuada pode aumentar, diminuir ou se manter constante ao longo do aumento do tamanho do corpo vegetativo. Embora compreendendo milhares de espécies, as epífitas são pouco conhecidas quanto ao padrão de alocação de recursos na reprodução sexuada. Neste estudo é descrita a variação da alocação de recursos na reprodução sexuada da bromélia epífita Tillandsia stricta Soland conforme diferentes tamanhos de corpo vegetativo. O objetivo é avaliar como tal alocação se dá para a inflorescência total à medida que seu corpo vegetativo cresce, bem como quantificar a participação das estruturas de suporte da inflorescência nesta alocação. Com o aumento do corpo vegetativo, a alocação de biomassa na inflorescência como um todo reduziu de 37% para 12%. Entretanto, especificamente para as estruturas de suporte e flores que constituem tal inflorescência, a redução na alocação de biomassa foi de 30% para 9%, nas estruturas de suporte, e de 10% para 3% nas flores. Tanto a área foliar total quanto a área por folha, usadas aqui como indicadoras de forrageamento, também aumentaram com o aumento do tamanho do corpo vegetativo. Tais resultados são discutidos quanto à capacidade de T. stricta de se reproduzir sexuadamente sob as condições heterogêneas da copa das árvores. Palavras-chave: alocação, alometria, Bromeliaceae, estruturas reprodutivas de suporte, TillandsiaABSTRACT -(Size-dependent allocation of biomass to ancillary versus flowers of the inflorescences of the epiphyte Tillandsia stricta Soland (Bromeliaceae)). The amount of resources invested in reproduction is closely correlated to plant size. However, the increase in reproductive investment is not always proportional to the increase in vegetative growth, as the proportion of plant resources allocated to reproduction can increase, decrease or be maintained along different plant sizes. Although comprising thousand of species, epiphytes are poorly studied in relation to reproductive allocation (RA). We describe the variation in the RA of the epiphytic bromeliad Tillandsia stricta Soland with increasing plant sizes. Our goal is not only to evaluate the RA of the whole inflorescence but also quantify the contribution of ancillary structures in the final RA of this plant species. With increasing sizes of T. stricta the reproductive allocation of biomass to the whole inflorescence decreased significantly along plant sizes from 37% to 12%. Reproductive allocation to ancillary and to flowers decreased respectively from 30% to 9% and 10% to 3%. As leaves are the main source of water and nutrients absorption in atmospheric Tillandsia, the total leaf area and ...

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What are Backshoots Good For? Seasonal Changes in Mineral, Carbohydrate and Water Content of Different Organs of the Epiphytic Orchid, Dimerandra emarginata

Cited by 43 publications

References 28 publications

Comparative anatomy of the absorption roots of terrestrial and epiphytic orchids

Comparative anatomy of the absorption roots of terrestrial and epiphytic orchids

The resorption of phosphorus is greater than that of nitrogen in senescing leaves of vascular epiphytes from lowland Panama

Size-dependent allocation of biomass to ancillary versus flowers of the inflorescences of the epiphyte Tillandsia stricta Soland (Bromeliaceae)

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