y y Geotropismo Positivo: si los órganos de la planta van en dirección al centro de la tierra; tal es el caso de las El geotropismo es un tipo de tropismo, propio de las plantas, que se refleja en un El gravitropismo se ve definido por la concentración diferencial de auxina. fototropismo em plantas EFECTOS FISIOLÓGICOS DE LAS AUXINAS: FOTOTROPISMO Y GRAVITROPISMO Existen tres sistemas principales de control de.
|Country:||Trinidad & Tobago|
|Published (Last):||27 December 2004|
|PDF File Size:||5.8 Mb|
|ePub File Size:||20.34 Mb|
|Price:||Free* [*Free Regsitration Required]|
Using PEG it was shown that the observed effects were not due to osmotic properties of the leaf extracts.
Biomass production in ornamental foliage plants: Plants were grown under climbing Acreeping B and hanging C training systems.
Effects of fire protection on savanna structure in Central Brazil. Contribution of changes in leaf size and leaf production rate to cytokinin-mediated growth promotion in Epipremnum aureum L.
Thus, inhibition of polar auxin transport in horizontally or downwardly oriented stems may ultimately result in a decreased whole-plant growth Keller, Third, the effect of exogenous growth regulators applications widely differed among training systems: Auxins are known to promote the differentiation of lateral roots as well Pacurar et al.
The science of grapevines: Allelopathic effects of parthenin against two weedy species, Avena fatua and Bidens pilosa. This effect led to important differences among training systems in RGR, which decreased together with departure from upward growth position Table 1.
Spanish words that begin with fo. Mean net assimilation rate NAR was calculated as:. Educalingo cookies are used to personalize ads and get web traffic statistics.
Trends for plant total leaf area of untreated controls at the end of the experiment, as well as for the relative rate of leaf expansion RLAEwere similar to those found for FW and DW accumulation, this is, significantly higher values for climbing plants than for creeping or hanging ones Table 3.
In the present work, we also found that growth of hanging plants was effectively promoted in the same way than creeping ones. Lower auxin levels in roots could in turn led to decreased root branching Pacurar et al.
Up to a large extent, differences in RLAE among training systems for each growth regulators combinations treatment accompanied those found for total leaf area at the end of the experiment.
Interference from established stands of silverleaf nightshade Solanum elaeagnifolium on cotton Gossypium hirsutum lint yield.
Meaning of “fototropismo” in the Spanish dictionary
Alelopatia de frutos de erva-mate Ilex paraguariensis no desenvolvimento do milho. Daily mean temperatures ranged between Journal of Fruit Science Allelopathic effect of Pluchea lanceolata Asteraceae on characteristics of four soils and tomato and mustard growth. Conversely, most growth regulators combinations i.
In the case of E. These results are in good agreement with previous work on creeping E. Discover all that is hidden in the words on. As was demonstrated through mathematical models of stem gravitropic movements Bastien et al.
Services on Demand Journal. When plants grown in pots under commercial facilities are vertically supported, leaf size significantly increases in comparison to leaves from basket hanging plants Di Benedetto et al.
Como citar este artigo. This effect may be regarded, in part, as a thigmomorphogenic response, but gravimorphogenetic effect may also be involved, since polar auxin transport is known to be negatively affected in plants with horizontal or hanging stems, which may result in an altered hormone balance at the whole plant level.
Spanish words that begin with fot. Control of leaf and vein development by auxin. This is consistent with hormone deficiency in creeping and hanging plants, possibly due to impaired IAA transport to roots, and with possible supraoptimal hormone levels in sprayed climbing plants, although direct evidence to check these possibilities is needed.
Quantitative anatomical data were obtained using Image Pro Express version 6.
Effects of light, growth media, and seedling orientation on biossays plajtas alfalfa autotoxicity. Environmental and Experimental Botany If departure from upward position results in decreased growth due to an impaired auxin transport to the root system, then exogenous auxin and cytokinin application to the foliage should be a straightforward manner to overcome such restriction. Seed dispersal of Solanum lycocarpum St.
función y relación
Samples of young fully expanded leaves were collected to examine plantaas anatomy i. The relative rate of leaf area expansion RLAE was calculated as the slope of the regression of the natural logarithm ln of total leaf area versus time in days. Combined hormone application in all combinations promoted RGR of creeping plants.
Gravimorphism and thigmomorphism may influence growth at the same time; for example, Steinitz et al.
Conversely, in hanging plants, endogenous auxin and cytokinin concentrations would not limit growth, and further increase in these concentrations through exogenous sprays could lead to supraoptimal levels with a negative impact on plant development. Lincoln Taiz, Eduardo Zeiger, Mean net assimilation rate NAR was calculated as: At high doses of both growth regulators in combined supply e.