SCION-INTERSTOCK RELATIONSHIPS AND ANATOMICAL AND PHYSIOLOGICAL LEAF CHARACTERISTICS OF FOUR AVOCADO GENOTYPES

Ayala-Arreola, Juan; Barrientos-Priego, Alejandro F.; Colinas-León, Ma. Teresa; Sahagún-Castellanos, Jaime; Reyes-Alemán, Juan Carlos

doi:10.5154/r.rchsh.2010.16.018

ISSN e: 2007-4018 / ISSN print: 2007-3828

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Vol. 16, issue 2 May - August 2010

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SCION-INTERSTOCK RELATIONSHIPS AND ANATOMICAL AND PHYSIOLOGICAL LEAF CHARACTERISTICS OF FOUR AVOCADO GENOTYPES

RELACIONES INJERTO-INTERINJERTO Y CARACTERÍSTICAS ANATÓMICAS Y FISIOLÓGICAS DE LA HOJA DE CUATRO GENOTIPOS DE AGUACATE

Juan Ayala-Arreola; Alejandro F. Barrientos-Priego; Ma. Teresa Colinas-León; Jaime Sahagún-Castellanos; Juan Carlos Reyes-Alemán

Keywords: CO2 assimilation, stomatal resistance, Persea americana, stomatal density, vascular system.

10.5154/r.rchsh.2010.16.018

Received: 2009-04-08
Accepted: 2009-06-23
Available online:
Pages:147

Abstract Highlights

The influence of interstock in anatomical and physiological leaf characteristics were evaluated in ‘Hass’, ‘Fuerte’, ‘Colín V-33’ and ‘Duke 7’ used as interstocks and final grafts. Stomatal density, epidermal cell density, stomatic index and stomata polar diameter were as¬sessed in leaf blade. In cross sections of the central vein and petiole of the leaf: area, perimeter, length of the minimum and maximum axis, roundness index and Feret diameter of xylem vessels were determined. Thickness of the upper and lower epidermis and thickness of palisade parenchyma I layer were measured in leaf cross sections. Physiological variables were CO2 assimilation rate, stomatic conductance, CO2 internal concentration, stomatic resistance, transpiration rate and leaf temperature. ‘Colín V-33’ as interstock induced higher stomatal and epidermal cell density and thicker palisade parenchyma I. In the intra genotype comparison, ‘Hass’ and ‘Fuerte’ with interstock increased stomatal density 18.8 and 17.8 %, respectively, while ‘Duke 7’ caused a 25.4 % reduction. Epidermal cell density increased in ‘Fuerte’ (23.3 %) with the presence of the interstock. ‘Fuerte’ and ‘Duke 7’ with interstock increased the thickness of the lower epidermis in 14.9 and 12.1 %, respectively, while ‘Hass’ and ‘Colín V-33’ with interstock reduced epidermis thickness by 19.5 and 1.0 %, respectively. ‘Hass’ as interstock promoted a higher CO2 assimilation rate than that promoted by ‘Duke 7’. ‘Colín V-33’, as a rootstock, showed lower stomatic resistance than ‘Duke 7’.

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