Leaf area estimation in a sugar beet cultivar by linear models

Tsialtas, J. T.; Maslaris, N.

doi:10.1007/s11099-005-0077-z

Cited by 42 publications

(23 citation statements)

References 9 publications

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“…Dried seed mass minus any dispersal structures has been recommended as the best and easiest method of seed measurement (Westoby 1998), with larger seeds producing seedlings better able to survive a variety of seedling hazards (Westoby et al 1996). We chose leaf width as a proxy for leaf area as leaf width has proven a good indirect measurement for leaf area (Tsialtas and Maslaris 2005;Williams and Martinson 2003). We believe early leaf size reflects plant fitness as early leaves are formed in the dormant buds the previous autumn (Critchfield 1971;Kikuzawa 1983).…”

Section: Discussionmentioning

confidence: 99%

Invasive Argentine ants reduce fitness of red maple via a mutualism with an endemic coccid

Brightwell

Silverman

2009

Biol Invasions

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Many invasive ant species form mutualisms with honeydew-producing Hemiptera and their aggressive presence deters the natural enemies of the Hemiptera. Invasive ant species like the Argentine ant have often been associated with hemipteran outbreaks in urban, agricultural and natural ecosystems. We investigated the effects of a mutualism between the invasive Argentine ant and the endemic terrapin scale on coccid density and the fitness of the host of this mutualism, the endemic red maple, situated in a commercial park. The terrapin scale has numerous natural enemies and we predicted that the high terrapin scale numbers associated with tending Argentine ants would collapse once Argentine ants were excluded from the host tree canopy. We predicted that excluding the Argentine ant from the tree canopy would result in an indirect net fitness benefit to the host. Terrapin scale numbers collapsed when Argentine ants were excluded from the host tree canopy. Red maples with Argentine ants excluded from their canopy had higher seed mass and larger early leaves indicating that this invasive ant-endemic scale mutualism imposed a net fitness cost to the host tree. The Argentine ant has yet to invade closedcanopy forest within its introduced range. The red maple is common in adjacent closed-canopy forest fragments and recent work has shown that invasion of these forest fragments by the Argentine ant is limited by a steady carbohydrate resource. We discuss the implications to forest invasion posed by a mutualism involving the Argentine ant and an endemic coccid.

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Section: Discussionmentioning

confidence: 99%

Invasive Argentine ants reduce fitness of red maple via a mutualism with an endemic coccid

Brightwell

Silverman

2009

Biol Invasions

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“…Such information on estimation of leaf area in clary sage is not available. The procedure used for developing the model has been used earlier by Tsialtas and Maslaris (2005); Tsialtas et al (2008) andFallavo et al (2008). The aim of this study was, therefore, to establish a LA prediction model based on L and W measurements and to test the accuracy of the proposed model for LA estimation, and to characterize variability within different accessions of clary sage.…”

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confidence: 99%

Allometric model for nondestructive leaf area estimation in clary sage (Salvia sclarea L.)

Kumar¹,

Sharma²

2010

Photosynt.

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Leaf area estimation is an important biometrical observation recorded for evaluating plant growth in field and pot experiments. In this study, conducted in 2009, a leaf area estimation model was developed for aromatic crop clary sage (Salvia sclarea L.), using linear measurements of leaf length (L) and maximum width (W). Leaves from four genotypes of clary sage, collected at different stages, were used to develop the model. The actual leaf area (LA) and leaf dimensions were measured with a Laser Area meter. Different combinations of prediction equations were obtained from L, W, product of LW and dry mass of leaves (DM) to create linear (y = a + bx), quadratic (y = a + bx + cx 2 ), exponential (y = ae bx ), logarithmic (y = a + bLnx), and power models (y = ax b ) for each genotype. Data for all four genotypes were pooled and compared with earlier models by graphical procedures and statistical measures viz. Mean Square Error (MSE) and Prediction Sum of Squares (PRESS). A linear model having LW as the independent variables (y = -3.4444 + 0.729 LW) provided the most accurate estimate (R 2 = 0.99, MSE = 50.05, PRESS = 12.51) of clary sage leaf area. Validation of the regression model using the data from another experiment showed that the correlation between measured and predicted values was very high (R 2 = 0.98) with low MSE (107.74) and PRESS (26.96).

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“…Many studies have been reported and propose non-destructive equations to estimate the growth of leaves in crops ( Tsialtas and Maslaris, 2005;Peksen, 2007;Olfati et al, 2010;Rouphael et al, 2010) and weeds (Carvalho et al, 2011a;Carvalho et al, 2011b). However, specifically for Cerrado woody species, there are not any models like the one proposed in the present paper, and consequently, experiments have to be conducted in a way that leaves must be excised.…”

Section: Discussionmentioning

confidence: 92%

Non-destructive equations to estimate the leaf area of Styrax pohlii and Styrax ferrugineus

Souza

Habermann

2014

Braz. J. Biol.

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We developed linear equations to predict the leaf area (LA) of the species Styrax pohlii and Styrax ferrugineus using the width (W) and length (L) leaf dimensions. For both species the linear regression (Y=α+bX) using LA as a dependent variable vs. W × L as an independent variable was more efficient than linear regressions using L, W, L 2 and W 2 as independent variables. Therefore, the LA of S. pohlii can be estimated with the equation LA=0.582+0.683WL, while the LA of S. ferrugineus follows the equation LA=-0.666+0.704WL. Keywords:Brazilian savanna, Styracaceae, validation, regression analysis, linear models. Equações lineares para estimativa de área foliar de Styrax pohlii e Styrax ferrugineus ResumoForam determinadas equações lineares para estimar a área foliar (AF) de Styrax pohlii e Styrax ferrugineus utilizando dimensões do limbo foliar (C -comprimento, L -largura). O modelo linear (Y=α+bX), utilizando AF vs. C × L, foi mais eficiente que os modelos lineares utilizando C, L, C 2 e L 2 como variáveis independentes na determinação da área foliar de S. pohlii e S. ferrugineus. Assim, a AF de S. pohlii pode ser estimada pelo modelo AF=0,582+0,683CL e a AF de S. ferrugineus pode ser estimada pelo modelo AF=-0,666+0,704CL.

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Leaf area estimation in a sugar beet cultivar by linear models

Cited by 42 publications

References 9 publications

Invasive Argentine ants reduce fitness of red maple via a mutualism with an endemic coccid

Invasive Argentine ants reduce fitness of red maple via a mutualism with an endemic coccid

Allometric model for nondestructive leaf area estimation in clary sage (Salvia sclarea L.)

Non-destructive equations to estimate the leaf area of Styrax pohlii and Styrax ferrugineus

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