Light spectral quality, phytochrome and plant competition

Schmitt, Johanna; Wulff, Renata D.

doi:10.1016/0169-5347(93)90157-k

Cited by 350 publications

(320 citation statements)

References 47 publications

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“…A dominância apical é influenciada pela razão V:Ve da radiação incidente (BALLARÉ et al, 1992;SCHMITT & WULFF, 1993). No entanto, os mecanismos pelos quais essa razão influencia a dominância apical são ainda desconhecidos (MARTIN, 1987).…”

Section: Introductionunclassified

O afilhamento da aveia afetado pela qualidade da luz em plantas sob competição

Almeida

Mundstock

2001

Cienc. Rural

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Section: Introductionunclassified

O afilhamento da aveia afetado pela qualidade da luz em plantas sob competição

Almeida

Mundstock

2001

Cienc. Rural

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“…Shade-avoidance responses are induced by lower amounts of photosynthetically active radiation (PAR), a decreased red to far-red ratio (R:FR) of the incident light, and the perception of ethylene produced by neighbouring plants (Schmitt & Wulff, 1993;Ballare et al ., 1994;Pierik et al ., 2003;Schmitt et al ., 2003). The induced responses enable plants to reduce the negative fitness consequences caused by competition for light (Aphalo & Ballare, 1995;de Kroon & Hutchings, 1995;Sultan, 1995;Huber & Hutchings, 1997;van Hinsberg, 1997;Geber & Griffen, 2003).…”

Section: Introductionmentioning

confidence: 99%

Shade avoidance inTrifolium repens: costs and benefits of plasticity in petiole length and leaf size

et al. 2006

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Research Summary• We tested whether the degree of shade-induced plasticity in petiole length and leaf area is related to the mean trait value expressed under high-light conditions, and to what extent trait values expressed under high-light and shaded conditions affect plant performance.• Thirty-four Trifolium repens genotypes were used with a wide range of petiole lengths and leaf areas. Plants were subjected to a high-light environment and two shading regimes: homogeneous shading and a vertical light gradient.• Absolute petiole elongation in response to both shading treatments and absolute leaf area expansion in response to homogeneous shading were independent of the trait values expressed in high light. Consequently, relative plasticity was higher for genotypes with lower high-light trait values. Plasticity was associated with enhanced plant performance in a vertical light gradient but not in homogeneously shaded conditions. We also found costs associated with the ability to express plasticity.• Our results suggest that selection can act separately on trait values expressed under high-light conditions and on the degree of plasticity.

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“…plastic or wire mesh) may also fail to capture morphological and allocational responses attributable to variation in light quality or spectral composition (Schmitt & Wulff 1993). Sunlight has a relatively uniform spectral distribution of quanta from 400-800 nm, whereas shade light that has passed through a forest canopy is depleted of quanta in the red and blue wavelengths, reducing the red:far red light ratio (measured at 655-665 nm and 725-735 nm respectively) from c. 1.2 under open sky to c. 0.2 under dense shade (Lee 1987, Stoutjestijk 1972.…”

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confidence: 99%

Growth responses of seedlings of two neotropical pioneer species to simulated forest gap environments

1999

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ABSTRACT. Traditional shade house experiments that expose plants to relatively uniform irradiance and light quality are inadequate to characterize the morphological, allocational and physiological plasticity that seedlings show to different gap environments. Here the design of a pot experiment is described that simulates the daily time course of irradiance and light quality in idealized gaps of six different sizes. Differences in response to gap size are illustrated using data from two pioneer species, Ochroma pyramidale, which recruits exclusively in large gaps and clearings, and Luehea seemannii, which colonizes small branchfall gaps as well as large gaps. Ochroma outperformed Luehea in relative growth rate in all except the smallest simulated gap size. Ochroma's superior performance in the larger gaps could be attributed to a larger proportional investment in leaf biomass (i.e. a higher leaf area ratio, LAR), and higher photosynthetic rates both on a leaf area and leaf mass basis. In the smallest simulated gaps LAR was not significantly different between the species, but Ochroma maintained a higher net assimilation rate. These results fail to support the suggestion that gap partitioning among pioneer species arises directly from morphological and biochemical specialization to particular gap light environments. Instead, it is suggested that partitioning may result from a trade-off between seedling growth and mortality determined by species allocational patterns and mediated by interactions with herbivores and pathogens.

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Light spectral quality, phytochrome and plant competition

Cited by 350 publications

References 47 publications

O afilhamento da aveia afetado pela qualidade da luz em plantas sob competição

O afilhamento da aveia afetado pela qualidade da luz em plantas sob competição

Shade avoidance inTrifolium repens: costs and benefits of plasticity in petiole length and leaf size

Growth responses of seedlings of two neotropical pioneer species to simulated forest gap environments

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