Harvest Season and Morphological Variation of Canistel (Pouteria campechiana) Fruit and Leaves Collected in Different Zones of Mexico

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Abstract
Canistel (Pouteria campechiana (Kunth) Baehni; yellow sapote, canistel) is an edible fruit that is native to Mexico; the tree is used as an ornamental and medicinal plant. Descriptive studies were carried out with the objective of characterizing the morphology of the fruit and leaves of trees located in different regions of Mexico to select outstanding specimens for large scale reproduction. The selection of trees was carried out in three geographically neighboring areas, where visible differences have been observed in fruit morphology: size, shape, color, number of seeds, and leaf shape. Semi-ripe fruit were collected from each area, weight and measurements were noted, seeds were extracted, and a data matrix was obtained: (fruit weight (grams), fruit polar diameter (centimeters), fruit equatorial diameter (centimeters), pulp weight (grams), number of seeds, seed weight (grams), seed polar diameter (centimeters), seed equatorial diameter (centimeters), and total soluble solids (SST)). Leaves were collected at the mature stage, and an image analysis was carried out to evaluate morphometric parameters: area, perimeter, major diameter, minor diameter, circularity, solidity, and angle. An analysis of variance was performed to find significant differences in the fruit data and a principal component analysis was performed with the leaf data. In Zone 2, the fruit had three seeds, the highest weight in all the zones sampled (180 to 330 g), and the greatest amount of pulp (198.88 g); they were subglobose in shape, and 33% soluble solids. There were eight months to harvest in Zone 1 and nine months in Zone 3. The main variables in the principal component analysis were leaf area, perimeter, and minor diameter; 84.6% of the variability represented by the first three components is sufficient to explain the difference between the leaves of the three zones. This data can be used to assess the propagation of canistel in areas with favorable climatic conditions for fruiting in tropical and subtropical regions.

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