Meiotic behavior and diploidy in Schinus terebinthifolia (Anacardiaceae)
2021
Kamila Bernardi Izoton | Luciana Dias Thomaz | Mário Luís Garbin | Patrícia Maria Oliveira Pierre
Abstract The genus Schinus (Anacardiaceae) comprises 30 species found in Peru, Bolivia, Chile, Paraguay, Uruguay, Argentina and Brazil. Schinus terebinthifolia (Brazilian pepper tree) is socioeconomically important in the Brazilian state of Espírito Santo. Dried fruit is used as a pepper-like spice and natural populations are exploited. Studies on the meiotic behavior and pollen stainability from an ecological and evolutionary point of view are essential, since they can promote future sustainable management strategies for this species. The objective was to evaluate meiotic behavior and characteristics of pollen grains of individuals from a natural population of S. terebinthifolia localized in the municipality of Vitória, Espírito Santo state, Brazil. Young anthers were squashed in 1% acetocarmine dye to obtain the pollen mother cells. The pollen stainability with 1% acetocarmine, Lugol’s iodine solution and Sudan IV and pollen shape were used to assess the pollen potential viability, cytochemistry and morphology. All individuals had a gametic number of n = 7, a regular meiotic behavior and so the somatic number is 2n = 2x = 14 chromosomes. Median pollen stainability was 94%. Pollen grains are dispersed as monads, 3 - colporate and subspheroidal. The exine has striate-reticulate ornamentation. Pollen grains are starch positive and lipid negative. This is the first report of the occurrence of diploidy for the species. The high pollen stainability is the result of the occurrence of regular meiosis. The presence of starch as pollen reserve can increase the resistance of pollen grains to hostile environments in this species.
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