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Abstract:

The epiphytic growth habit in many Ficus species during their juvenile stages has commonly been hypothesized to be an adaptation for avoiding deep shade in the forest understory, but this has never been tested experimentally. We examined growth and ecophysiology in seedlings of three hemiepiphytic (Hs) and three non-hemiepiphytic (NHs) Ficus species grown under different irradiance levels. Both Hs and NHs exhibited characteristics of high light requiring species, such as high plasticity to growth irradiance and relatively high maximum photosynthetic assimilation rates. Diurnal measurements of leaf gas exchange showed that Hs have much shorter active photosynthetic periods than NHs; moreover, leaves of Hs have lower xylem hydraulic conductivity but stronger drought tolerance as indicated by much lower rates of leaf diebacks during the drought treatment. Seedlings of NHs had 3.3- and 13.3-fold greater height and biomass than those of Hs species after growing in the nursery for 5months, indicating a trade-off between growth and drought tolerance due to the conflicting requirements for xylem conductivity and cavitation resistance. This study does not support the shade-avoidance hypothesis; rather, it suggests that the canopy regeneration in Hs is an adaptation to avoid alternative terrestrial growth-related risks imposed to tiny Ficus seedlings. The NHs with terrestrial regeneration reduce these risks by having an initial burst of growth to rapidly gain relatively large seedling sizes, while in Hs seedlings more conservative water use and greater drought tolerance for surviving the canopy environment are intrinsically associated with slow growth. © Physiologia Plantarum 2012.

Registro:

Documento: Artículo
Título:Is hemiepiphytism an adaptation to high irradiance? Testing seedling responses to light levels and drought in hemiepiphytic and non-hemiepiphytic Ficus
Autor:Hao, G.-Y.; Wang, A.-Y.; Sack, L.; Goldstein, G.; Cao, K.-F.
Filiación:Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan Province, 666303, China
Department of Biology, University of Miami, Coral Gables, FL, 33124, United States
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, United States
Department of Ecology and Evolutionary Biology, University of California Los Angeles, Los Angeles, CA, United States
Departamento de Ciencias Biológicas, Laboratorio de Ecología Funcional (CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Nuñez, Buenos Aires, Argentina
Palabras clave:water; adaptation; article; biomass; drought; Ficus; photosynthesis; physiology; radiation exposure; seedling; sunlight; xylem; Adaptation, Biological; Biomass; Droughts; Ficus; Photosynthesis; Seedling; Sunlight; Water; Xylem
Año:2013
Volumen:148
Número:1
Página de inicio:74
Página de fin:86
DOI: http://dx.doi.org/10.1111/j.1399-3054.2012.01694.x
Título revista:Physiologia Plantarum
Título revista abreviado:Physiol. Plant.
ISSN:00319317
CODEN:PHPLA
CAS:water, 7732-18-5; Water, 059QF0KO0R
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319317_v148_n1_p74_Hao

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Citas:

---------- APA ----------
Hao, G.-Y., Wang, A.-Y., Sack, L., Goldstein, G. & Cao, K.-F. (2013) . Is hemiepiphytism an adaptation to high irradiance? Testing seedling responses to light levels and drought in hemiepiphytic and non-hemiepiphytic Ficus. Physiologia Plantarum, 148(1), 74-86.
http://dx.doi.org/10.1111/j.1399-3054.2012.01694.x
---------- CHICAGO ----------
Hao, G.-Y., Wang, A.-Y., Sack, L., Goldstein, G., Cao, K.-F. "Is hemiepiphytism an adaptation to high irradiance? Testing seedling responses to light levels and drought in hemiepiphytic and non-hemiepiphytic Ficus" . Physiologia Plantarum 148, no. 1 (2013) : 74-86.
http://dx.doi.org/10.1111/j.1399-3054.2012.01694.x
---------- MLA ----------
Hao, G.-Y., Wang, A.-Y., Sack, L., Goldstein, G., Cao, K.-F. "Is hemiepiphytism an adaptation to high irradiance? Testing seedling responses to light levels and drought in hemiepiphytic and non-hemiepiphytic Ficus" . Physiologia Plantarum, vol. 148, no. 1, 2013, pp. 74-86.
http://dx.doi.org/10.1111/j.1399-3054.2012.01694.x
---------- VANCOUVER ----------
Hao, G.-Y., Wang, A.-Y., Sack, L., Goldstein, G., Cao, K.-F. Is hemiepiphytism an adaptation to high irradiance? Testing seedling responses to light levels and drought in hemiepiphytic and non-hemiepiphytic Ficus. Physiol. Plant. 2013;148(1):74-86.
http://dx.doi.org/10.1111/j.1399-3054.2012.01694.x