Resumen

ABURTO-CANSINO, Gloria Nazdira; RUIZ-CORRAL, José Ariel; SANCHEZ GONZALEZ, José de Jesús  y  GONZALEZ EGUIARTE, Diego Raymundo. Cardinal temperatures of teocintle development (Zea spp.). Rev. Mex. Cienc. Agríc [online]. 2018, vol.9, n.6, pp.1269-1281. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v9i6.1587.

Teocintle represents an important source of genes for the improvement of maize (Zea mays L.); however, little progress has been made in the characterization of their responses to various environmental conditions, including the development of the teocintle as a function of temperature, this being a key variable for its adaptation and distribution. The base temperature (Tb), optimum temperature (To) and maximum threshold temperature (Tu) are also known as cardinal temperatures of development and are particular for each species, genotype and phenological stage. The objective of the present study was to determine the cardinal temperatures of the teocintle populations Zea perennis, Zea diploperennis, Zea mays subsp. mexicana races Chalco, Durango, Mesa Central and Nobogame and Zea mays subsp. parviglumis or race Balsas. Data from field experiments conducted between 1986 and 2005 were used where data from days to anthesis (F), temperature and precipitation data were monitored. Linear and curvilinear models were used to explain the variation of the development rate of the sowing-anthesis stage (1/F) as a function of the variation of the mean temperature (Tm) of the sowing-flowering period. The results showed that the relationship between Tm and 1/F is described by a curvilinear function, in all cases adjusting a quadratic-exponential model, with a value of r2> 0.73. The value of Tb varied from 8.02 to 14.31 °C, that of To between 23.5 and 31.67 °C and that of Tu between 29.43 and 40.61 °C. It is concluded that the cardinal temperature values of the teocintle vary between and within races, which indicates adaptation to various thermal conditions for the teocintle breeds studied.

Palabras llave : cardinal temperatures; maize genetic resources; populations of teocinte; wild relatives.

        · resumen en Español     · texto en Español | Inglés     · Español ( pdf ) | Inglés ( pdf )