Abstract

MEDINA-TORRES, Raúl; SALAZAR-GARCIA, Samuel; CASTILLO-SERRANO, Brenda Edén  and  BARRIENTOS-PRIEGO, Alejandro. Variation in the transpiration rate of 'Colinmex'avocado using interstocks under two soil moisture regimes. Rev. Chapingo Ser.Hortic [online]. 2013, vol.19, n.1, pp.117-127. ISSN 2007-4034.  https://doi.org/10.5154/r.rchsh.2011.10.056.

The transpiration rate (E) of 'Colinmex' avocado was evaluated over a year to determine its seasonal variation under two soil moisture (SM)regimes and its relationship to phenological phases. The following cultivar/interstock/rootstock (regional criollo originated from seed) andsoil moisture regime combinations were evaluated: T1) 'Colinmex'/'Colin-V101'/rootstock, irrigated; T2) 'Colinmex'/'Colin-V101'/rootstock,rainfed; T3) 'Colinmex'/'Colin-V33'/rootstock, irrigated; T4) 'Colinmex'/'Colín-V33'/rootstock, rainfed. The transpiration rate varied from 1.38to 4.55 mmol H₂O·m⁻²·s⁻¹ over the year; and during this time, available SM and ambient relative humidity (RH) were strongly correlated toE (r² = 0.70 and 0.93, respectively). In the winter, T1 and T2 showed the highest E values, 3.32 and 3.3.18 mmol H₂O·m⁻²·s⁻¹, respectively.In the spring, E was similar from treatment to treatment with values ranging between 1.22 to 1.72 mmol H₂O·m⁻²·s⁻¹; this season also hadthe most severe SM deficit, the highest temperatures and the lowest RH. The highest E values occurred in the summer with averagesfrom 4.45 to 4.65 mmol H₂O·m⁻²·s⁻¹. Similar E values were recorded during the fall for T1, T2 and T4 (4.10 to 4.90 mmol H₂O·m⁻²·s⁻¹). The highest averages of fruit weight, fruit number and fruit yield per tree corresponded to T3. Treatments with irrigation had the highest fruit production per tree.

Keywords : Persea americana Mill.; porometry; water stress.

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