Photosynthetic Capacity Increases with Plant Size

Zotz, Gerhard

doi:10.1111/j.1438-8677.1997.tb00644.x

Cited by 32 publications

(31 citation statements)

References 24 publications

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“…This suggests that our observations cannot simply be explained by the fact that the same environmental conditions impose different levels of stress on plants of different size, i.e. that smaller plants experience a proportionately higher water loss after stomatal closure due to higher surface-to-volume ratios (Zotz 1997). Zotz (2000b) discussed how the size dependency of physiological parameters complicates the ecological interpretation of previous studies with vascular epiphytes, most of which ignored plant size.…”

Section: Discussionmentioning

confidence: 93%

“…A major finding of previous work was that ecophysiological characteristics of this and many other epiphyte species change substantially with plant size (Zotz 2000b). Size dependency has been demonstrated for leaf gas exchange parameters such as photosynthetic capacity (Zotz 1997; and stomatal regulation , for whole-plant water relations and nutrient allocation to reproduction (Zotz 2000a). We can now add ABA relations to this list.…”

Section: Discussionmentioning

confidence: 94%

“…Zotz and Tyree 1996;Zotz 1997Zotz , 1998, addressing the implications of frequent drought in the epiphytic habitat from the level of plant organs (e.g. Zotz and Tyree 1996) to that of populations (Zotz 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Particular emphasis was paid to the importance of plant size. The need to do so has become clear only recently, when consistent size-related differences in gas exchange parameters were found in D. emarginata and a number of other epiphyte species (Zotz 1997;. Considering the usual close link between ABA relations and plant gas exchange, we expected changes in ABA to depend similarly upon plant size, and thus included almost the entire size range of this species in our study, excluding only the smallest specimens for methodological reasons.…”

Section: Introductionmentioning

confidence: 99%

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Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

2001

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Changes in abscisic acid (ABA) content and several water relations parameters were studied in the epiphytic orchid Dimerandra emarginata in the tropical lowlands of Barro Colorado Island, Panama. Similar to previous observations of size dependency of physiological parameters in vascular epiphytes, we found significant differences in ABA accumulation (both in terms of temporal patterns and amount) in small and large plants under drought stress. The highest values of ABA content in leaves, stems, and roots were found in the smaller specimens, reaching the levels of poikilohydric resurrection plants. Substantial accumulation of ABA occurred after stomatal closure, indicating other functions of ABA than stomatal regulation in this bark epiphyte.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

2001

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“…Almost all studies related to bromeliad size have focused on the measurement of the responses of the photosynthetic apparatus, gas exchange, transpiration rates and morphological changes in relation to environmental factors (Adams and Martin, 1986a, b;Zotz, 1997;Zotz and Thomas, 1999). For example, adult tank-forming bromeliads under well-watered conditions show higher rates of CO 2 exchange and transpiration than smaller ones (Adams and Martin, 1986a).…”

Section: Raiza J Castillo Et Almentioning

confidence: 99%

Drought and extreme temperature tolerance for <em>Tillandsia dasyliriifolia</em>, an epiphytic bromeliad from the northern coastal dune scrubland in Yucatan, Mexico

2016

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Abstract:The ecophysiological investigations about epiphytic plants have focused on the establishment of mechanistic explanations of how plants respond to changes in their environment. The main objective of this work was to assess the drought and extreme temperature tolerance of Tillandsia dasyliriifolia individuals growing in two coastal dune scrub sites with different precipitation patterns and microhabitat distribution. This study was focused on the effect of plant size on tolerance parameters. Drought and extreme temperature tolerance were evaluated in small (S1, 9 cm) and large individuals (S2, 35 cm). Tolerance between sites was not different but varied between size classes. Tillandsia dasyliriifolia shows moderate tolerance to drought in comparison to more succulent plants. The 50% of the leaves in small plants died after 40 days of drought and after 60 days for large plants. T. dasyliriifolia also exhibits moderate tolerance to extreme temperatures tolerance, small plants tolerate a temperature range from 11 ºC to 40 ºC and the range for large plants is a little broader (9 °C to 43 °C). Key words: Epiphyte, crassulacean acid metabolism, plant size, drought tolerance, temperature tolerance.Resumen: Las investigaciones ecofisiológicas sobre las plantas epífitas se centran en establecer mecanismos que expliquen cómo las plantas responden a los cambios en su entorno. El objetivo de este trabajo fue evaluar la tolerancia a la sequía y temperaturas extremas de individuos de Tillandsia dasyliriifolia provenientes de dos localidades de matorral de duna costera con diferentes patrones de precipitación, fisonomía y en la distribución de microhábitats. En ambos sitios se evaluó la tolerancia a la sequía y a temperaturas extremas de individuos de diferentes tamaños, 9 cm (S1) y 35 cm (S2). No se encontraron diferencias en las tolerancias entre sitios pero sí entre tamaños T. dasyliriifolia es moderadamente tolerante a la sequía, cuando se le compara con plantas más suculentas, ya que el 50 % de las hojas en individuos pequeños murieron hasta los 40 días de sequía y en los individuos grandes hasta los 60 días. La tolerancia a temperaturas extremas de T. dasyliriifolia también es moderada. Las plantas pequeñas toleran intervalos entre 11 ºC a 40 ºC mientras que las plantas más grandes de 9 ºC a 43 ºC. Palabras clave: Epifita, metabolismo ácido de las crasuláceas, tamaño de las plantas, tolerancia a la sequía, tolerancia a temperatura.

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Tunicate bulb size variation in monocots explained by temperature and phenology

Howard

Cellinese

2020

Ecology and Evolution

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Plant bulbs are modified shoot systems comprised of short internodes with apical bud(s) surrounded by layers of leaf bases. Bulb diameters can vary greatly, with overall bulb size playing a role in flower formation and resource allocation. Despite the importance of bulb size to the overall fitness of an individual, evolutionary and ecological aspects of this trait have been almost completely neglected. Examining over 2,500 herbarium vouchers for 115 selected species, we analyzed monocot tunicate bulb size within a phylogenetic context in order to investigate its evolutionary significance. We recorded two bulb diameter optima and observed that as bulb size increases taxa inhabit warmer areas with less temperature seasonality. Furthermore, we found that hysteranthous taxa, a habit where leaves emerge separately from flowers, exhibit overall larger bulbs potentially due to reliance upon belowground stored resources to flower rather than on current environmental inputs. This work highlights the importance of including the belowground portion of plants into ecological and evolutionary studies in order to gain a more complete understanding of the evolution of plant forms and functions.

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Photosynthetic Capacity Increases with Plant Size

Cited by 32 publications

References 24 publications

Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

Ecophysiological consequences of differences in plant size: abscisic acid relationships in the epiphytic orchid Dimerandra emarginata

Drought and extreme temperature tolerance for <em>Tillandsia dasyliriifolia</em>, an epiphytic bromeliad from the northern coastal dune scrubland in Yucatan, Mexico

Tunicate bulb size variation in monocots explained by temperature and phenology

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