Morpho-physiological responses of Nothofagus obliqua to light intensity and water status, with focus on primary growth dynamics

Torres, Cristián; Magnin, Amaru; Varela, Santiago; Stecconi, Marina; Grosfeld, Javier; Puntieri, Javier

doi:10.1007/s00468-018-1712-1

Cited by 9 publications

(8 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Summer is the peak period of growth and development for most plants, and hot climate conditions are conducive to the accumulation of biomass and vegetative growth [14]. For example, the differentiation of bud organs in temperate species usually takes place in summer [15]. However, the higher light intensity in summer is far beyond the capacity limits of plant photosynthetic organs, and excessive light energy induces the activation of plant light protection mechanisms that intensify thermal energy dissipation or increase reactive oxygen species (ROS) accumulation [16].…”

Section: Introductionmentioning

confidence: 99%

Morphological and Physiological Responses of Pinus massoniana Seedlings to Different Light Gradients

Wang

et al. 2021

Forests

View full text Add to dashboard Cite

Light intensity is a critical factor regulating photosynthetic capacity in plants. However, the effects of varying light intensity on morphological and photoprotective mechanisms in Pinus massoniana seedlings have not been explored in depth, especially those in the first seedling growing season. We measured the growth, photosynthetic physiology, biochemistry, and chlorophyll fluorescence of P. massoniana seedlings at four light gradients: 100% relative irradiance (RI, full sunlight), 70% RI, 50% RI, and 20% RI. The seedling height at 70% RI was 9.27% higher than that at 100% RI. However, seedling height was inhibited under low light intensity; at 20% RI, all seedlings died. The decreasing light intensity inhibited ground diameter growth but increased the height-diameter ratio. The secondary needle emergence rate was 53.4% higher at 70% RI than at 100% RI but was only 2% at 50% RI. The chlorophyll and carotenoid contents increased significantly with decreasing light intensity. The increased Chl b and Car contents promoted the photoreceptor potential of the violet (400~420 nm), blue (440~480 nm), and yellow-orange (597~655 nm) regions in leaves. Among the chlorophyll fluorescence parameters, Fv/Fm, Fv′/Fm′, Y(II), qp, and ETR all reached maximum values at 70% RI but were significantly lower at 50% RI than at 100% RI. However, decreasing the light intensity caused a reduction in NPQ. The 70% RI level increased POD and SOD activity and the contents of osmotic regulation substances and slowed MDA accumulation. Seedlings at 70% RI had a higher growth rate, higher photosynthetic activity and potential, and significantly greater stress resistance than the other seedlings. Therefore, appropriate shading measures were beneficial to the cultivation of vigorous seedlings. Furthermore, spectral reflectance indexes were found to be a suitable tool for monitoring the photosynthetic physiological characteristics, stress resistance characteristics, and growth status of P. massoniana seedlings in real time.

show abstract

Section: Introductionmentioning

confidence: 99%

Morphological and Physiological Responses of Pinus massoniana Seedlings to Different Light Gradients

Wang

et al. 2021

Forests

View full text Add to dashboard Cite

show abstract

“…There are several possible factors that affect the distribution of leaf pigments, e.g., light environment [38,39], leaf senescence [40], tree age [41], nitrogen and water availability [42][43][44], etc. Effective methods for measurements of the 3D spatial distribution of leaf pigments are needed for better understanding of these plant functions.…”

Section: Discussionmentioning

confidence: 99%

Estimating 3D Chlorophyll Content Distribution of Trees Using an Image Fusion Method Between 2D Camera and 3D Portable Scanning Lidar

2019

View full text Add to dashboard Cite

An image fusion method has been proposed for plant images taken using a two-dimensional (2D) camera and three-dimensional (3D) portable lidar for obtaining a 3D distribution of physiological and biochemical plant properties. In this method, a 2D multispectral camera with five bands (475-840 nm) and a 3D high-resolution portable scanning lidar were applied to three sets of sample trees. After producing vegetation index (VI) images from multispectral images, 3D point cloud lidar data were projected onto the 2D plane based on perspective projection, keeping the depth information of each of the lidar points. The VI images were 2D registered to the lidar projected image based on the projective transformation and VI 3D point cloud images were reconstructed based on the depth information. Based on the relationship between the VI values and chlorophyll contents taken by a soil and plant analysis development (SPAD)-502 plus chlorophyll meter, 3D distribution images of the chlorophyll contents were produced. Similarly, a thermal 3D image for a sample was also produced. The resultant chlorophyll distribution images offered vertical and horizontal distributions, and those for each orientation for each sample, showing the spatial variability of the distribution and the difference between the samples.

show abstract

“…We speculate that the species has high plasticity to light levels, but this might be a specific feature of young plants. Torres et al (2018) mentioned that the acclimation capacity of a species to different light levels at early ontogenic stages is associated with its ability to prosper in the forest understory. Otherwise, as plants develop in the understory, they might also be limited for other resources than light, such as water acquisition and temperature.…”

Section: Iforest -Biogeosciences and Forestrymentioning

confidence: 99%

“…Pine species are good competitors for resources, and they decrease the composition and abundance of understory species as crown develops (Franzese et al 2017). Thus, the low vigor of A. bijuga growing under pine canopies might be associated with complex interactions among light, temperature, and water availability (Torres et al 2018), which needs further investigations. Overall, species of the genus Adesmia have great potential for forage and for medicinal purposes (Gerding et al 2017), and are well adapted to the semi-arid condition in Mediterranean climates due to its high stomatal control (Rada et al 1999).…”

Section: Iforest -Biogeosciences and Forestrymentioning

confidence: 99%

Growth and physiological acclimation to shade in young plants of Adesmia bijuga Phil., a critically endangered species in central Chile

Yáñez¹,

Gómez²,

Gajardo³

et al. 2021

iForest

View full text Add to dashboard Cite

Biogeosciences and Forestry Biogeosciences and ForestryGrowth and physiological acclimation to shade in young plants of Adesmia bijuga Phil., a critically endangered species in central Chile Marco A Yáñez (1) , Persy Gómez (2) , John Gajardo (3) , Sergio Espinoza (4) Adesmia bijuga Phil. is an endemic and endangered shrub species of central Chile. Its potential shade intolerance is one of the leading hypotheses for its vigor loss when the species grows beneath closed canopies. The objective of this study was to assess the growth and physiological acclimation to the shade of young plants of A. bijuga. A nursery experiment was established with three light levels based on the interception of photosynthetic active radiation (PAR) (TRT0: control at full sun; TRT60: 60% shaded; TRT90: 90% shaded), and maintained for 71 days during the summer season. Growth and leaf morpho-physiological responses were evaluated at the beginning, at the middle, and at the end of the experiment. The shading treatment increased plant height (H), live crown percentage (Lcrown), and specific leaf area (SLA) compared to the control treatment at full sun. However, light-saturated photosynthetic rate (Amax), dark respiration rate (Rd), and light compensation point (Γi) were higher in TRT60 than in the other treatments, while no differences were found among treatments for the apparent quantum yield (α). At this stage of plant development, our results suggest high acclimation plasticity of A. bijuga to light levels; however, a semi-shade environment (i.e., TRT60) favored a better performance of the species.

show abstract

Morpho-physiological responses of Nothofagus obliqua to light intensity and water status, with focus on primary growth dynamics

Cited by 9 publications

References 56 publications

Morphological and Physiological Responses of Pinus massoniana Seedlings to Different Light Gradients

Morphological and Physiological Responses of Pinus massoniana Seedlings to Different Light Gradients

Estimating 3D Chlorophyll Content Distribution of Trees Using an Image Fusion Method Between 2D Camera and 3D Portable Scanning Lidar

Growth and physiological acclimation to shade in young plants of Adesmia bijuga Phil., a critically endangered species in central Chile

Contact Info

Product

Resources

About