Resumo

USECHE-CARRILLO, Nora Virginia; AYALA-ARREOLA, Juan; CAMPOS-ROJAS, Eduardo  e  BARRIENTOS-PRIEGO, Alejandro Facundo. Relationships between stomatal and gas exchange characteristics of the leaf blade in 'Colín V-33' avocado seedlings. Rev. Chapingo Ser.Hortic [online]. 2022, vol.28, n.3, pp.133-144.  Epub 13-Dez-2022. ISSN 2007-4034.  https://doi.org/10.5154/r.rchsh.2021.05.008.

The use of avocado rootstocks is very common, but these have been little studied from the anatomical and physiological point of view of the leaf, variables that can be useful to understand their role when grafted, such as those related to stomata and gas exchange. The aim of this research was to study the stomatal and gas exchange characteristics of the leaf blade in seedlings derived from ‘Colín V-33’ avocado seed to determine possible relationships between them. Ninety-three six-month-old ‘Colín V-33’ seed-derived plants were used. Four stomatal and five gas exchange variables were evaluated in the eleventh leaf of each plant. Stomata were classified as anomocytic, and their length ranged from 13.11 to 19.65 µm, their density varied from 317.65 to 105.88 stomata·mm-2 and their stomatal index was from 11.78 to 26.16 %. A significant positive correlation was found between the physiological variables stomatal conductance and transpiration rate (r = 0.96**), while the CO2 assimilation rate and internal CO2 concentration were negatively correlated (r = -0.64**). No association was found between gas exchange characteristics and stoma-related variables. Due to the variation found in stomatal density and stomatal index, it is possible to select contrasting genotypes that could have an impact on grafting when used as rootstocks, given the evidence from other studies where there are modifications in these variables.

Palavras-chave : Persea americana Mill.; gas exchange; stomatal index; stomatal density; stomatal conductance; transpiration.

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