Photosynthetica, 2015 (vol. 53), issue 3

Photosynthetica 2015, 53(3):342-348 | DOI: 10.1007/s11099-015-0117-2

Simple and accurate allometric model for leaf area estimation in Vitis vinifera L. genotypes

D. Buttaro1, Y. Rouphael2,*, C. M. Rivera3, G. Colla3, M. Gonnella1,*
1 Institute of Sciences of Food Production (CNR-ISPA), Bari, Italy
2 Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
3 Department of Agriculture, Forestry, Nature and Energy, University of Tuscia, Viterbo, Italy

The aim of the present experiment was to evaluate the currently used allometric models for Vitis vinifera L., as well as to develop a simple and accurate model using linear measurements [leaf length (L) and leaf width (W)], for estimating the individual leaf area (LA) of nine grapevine genotypes. For model construction, a total of 1,630 leaves coming from eight genotypes in 2010 was sampled during different leaf developmental stages and encompassed the full spectrum of leaf sizes. The model with single measurement of L could be considered an interesting option because it requires measurement of only one variable, but at the expense of accuracy. To find a model to estimate individual LA accurately for grapevine plants of all genotypes, both measurements of L and W should be involved. The proposed linear model [LA = -0.465 + 0.914 (L × W)] was adopted for its accuracy: the highest coefficient of determination (> 0.98), the smallest mean square error, the smallest prediction sum of squares, and the reasonably close prediction sum of squares value to error sum of squares. To validate the LW model, an independent data set of 200 leaves coming from another genotype in 2011 was used. Correlation coefficients showed that there was a highly reliable relationships between predicted leaf area and the observed leaf area, giving an overestimation of 0.8% in the prediction.

Keywords: estimation model; linear regression; nondestructive method

Received: July 17, 2014; Accepted: December 5, 2014; Published: September 1, 2015Show citation

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Buttaro, D., Rouphael, Y., Rivera, C.M., Colla, G., & Gonnella, M. (2015). Simple and accurate allometric model for leaf area estimation in Vitis vinifera L. genotypes. Photosynthetica, 53(3), 342-348. doi: 10.1007/s11099-015-0117-2.
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