Non-destructive measurement of leaf area and leaf pigments in feijoa trees

Abstract

Leaf area (cm2 per leaf) and leaf pigment content are important traits that can be used to better understand a plants physiology. In this study, empirical non-destructive models for leaf area and leaf pigment based on the leaf dimensions, length (L) and width (W) in centimeters, and chlorophyll meter readings were developed for feijoa (Acca sellowiana). The experiment was carried out during January 2016 using five-year-old trees of 60 genotypes, grown under field conditions in the state of Paraná, Brazil. The proposed leaf area (LA) model was L A = 0 . 0022 L 3 + 0 . 1482 W 2 + 0 . 6159 L W + 0 . 1076 (R2 = 0.99). Three current leaf area models found in the literature were also assessed. All of the already created models were less accurate than the model proposed in this article. The proposed leaf pigment models were based on the Falker Chlorophyll Index for Chlorophyll a (A) and b (B), these were C h l a = 2 . 564 A + 13 . 098 B - 42 . 605 (R2 = 0.94), C h l b = 1 . 538 A + 3 . 287 B + 8 . 847 (R2 = 0.86) and C a r o t e n o i d s = 0 . 947 B + 8 . 943 (R2 = 0.88) expressed as µmol m-2 of leaf blade. In conclusion, the proposed models in this study were shown to be a reliable non-destructivel way of estimating A. sellowiana leaf area and leaf pigment.

Influence of some environmental factors on the feijoa (Acca sellowiana [Berg] Burret): A review

“…It also has medicinal value for its antibacterial, antioxidant and antiallergic activity, with a higher content of antioxidants, such as flavonoids and ascorbic acid in the fruit skin rather than in the pulp (Phan et al, 2020). Sachet et al (2019) confirm that ecophysiological studies are necessary to improve the cultivation of feijoa. Furthermore, Germanà and Continella (2004) clearly state that ecophysiological evaluation is important for understanding the possibilities of acclimatization and the diffusion of species, including feijoa.…”

“…It was introduced to other countries in the world, where it is known as feijoa or pineapple guava (Moretto et al, 2014). The most extensive production is found in Colombia, New Zealand, Georgia, Ukraine, but also in the United States, Australia, Turkey, China and with an increasing area of cultivation in Brazil (Sachet et al, 2019;Sánchez-Mora et al, 2019). This distribution in such varied countries and climates demonstrates the great potential for the plasticity that this species possesses for adaptation to very diverse environmental conditions (Donazzolo et al, 2019).…”

Aspectos del cultivo y la fisiología de la feijoa (Acca sellowiana [Berg] Burret). Una revisión

“…La feijoa (Acca sellowiana [O. Berg] Burret) es oriunda de América del Sur, de la región del sur de Brasil, Uruguay, zona alta de Paraguay occidental y el noreste de Argentina (Parra-Coronado & Fischer, 2013). Es mayormente sembrada en Colombia, Nueva Zelanda, Georgia y Ucrania, y en áreas menores en Estados Unidos, Australia, Nueva Zelanda, Turquía y China, con plantaciones crecientes en Brasil (Sachet et al, 2019), por lo cual Donazzolo et al (2019) destacan su plasticidad y adaptación a condiciones ambientales muy diversas, hecho demostrado por esta distribución en zonas y climas tan variados.…”

Symptoms and growth components in feijoa (Acca sellowiana [O. Berg] Burret) plants in response to calcium, magnesium and boron deficiencies

“…Feijoa plantations are found in Colombia, New Zealand, Georgia and Ukraine, and in smaller areas in the United States, Australia, New Zealand, Turkey and China, with orchards in Brazil (Sachet et al, 2019).…”