Influence of luminosity on the initial growth of Carapa guianensis,  Clitoria fairchildiana and Inga edulis tree seedlings

Moura-Silva, Carlos Eduardo; Andrade, P. C.; Santos, Wenderson Nunes dos

doi:10.15361/1984-5529.2017v45n4p422-429

Cited by 1 publication

(1 citation statement)

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“…According to [28], light, when in excess, can act both as a subsidy and an inhibitor of photosynthesis, being associated with alteration or low acclimatization capacity of the photosystem in light receptors, which can cause photoinhibition in plants, reflecting on the Fv/Fm ratio. The plants in full sunlight in this experiment showed symptoms of photoinhibition stress (Figure 1C), as the Fv/Fm ratio below 0.8 is indicative of photoinhibition, and the lower, the more intense the effect [29]. The inverse situation would be the maintenance of the Fv/Fm ratio at high levels, which indicates the adaptation of the leaves to the solar radiation conditions to which they are submitted [30].…”

Section: Discussionmentioning

confidence: 99%

Ecophysiology Responses of Andiroba Seedlings (Carapa Guianensis Aubl.) Under Different Levels of Shading

Tribuzy,

Camargo,

Silva

et al. 2023

Preprint

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Defining the best conditions for the initial development of native species is one of the significant challenges to forest production. Therefore, this study aimed to evaluate andiroba's physiological behavior and growth (Carapa guianensis Aubl.) seedlings at different shading levels. In a nursery seedling, C. guianensis seedlings grew on 0, 30, 50, and 70% shading, obtained with polyethylene screens. We measured at six plants per treatment. For the physiological data we measurement four times the total chlorophyll content, chlorophyll a/b ratio, maximum photochemical efficiency of photosystem II (Fv/Fm), maximum potential photosynthesis (A), stomatal conductance (gs), transpiration (E), intrinsic water use efficiency (WUEi), and carbon use efficiency (CUE), besides the growth parameters. While for growth rates parameters we developed six evaluation for as leaf area ratio (LAF), relative growth rates (RGR), and net assimilation rate (NAR). Chlorophyll content and Fv/Fm were inversely proportional to the light intensity. The other physiological and growth parameters showed better behavior in shaded environments, emphasizing the 50% treatment, with no significant difference between the 30% shading treatment. Therefore, the C. guianensis seedlings present growth plasticity under different shading levels, and we recommended producing seedlings at 50 or 30% shading.

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Section: Discussionmentioning

confidence: 99%