Resumo

ORTEGON MORALES, Alfredo Sergio; DIAZ FRANCO, Arturo; GONZALEZ QUINTERO, Javier  e  GARZA CANO, Idalia. Temperature on the reproductive stage in canola (Brassica napus L.). Agric. Téc. Méx [online]. 2006, vol.32, n.3, pp.259-265. ISSN 0568-2517.

The elevated production of canola in the world, has promoted the formation of hybrids and cultivars with adaptation to a wide range of environments. This crop is being introduced in some regions of north and central Mexico, including the state of Tamaulipas. The objective of this study was to determine the environmental effect of temperature (heat units) on the reproductive period and yield of canola during the period of 2003-2004 at Rio Bravo, Tamaulipas, Mexico. Four cultivars and two hybrids were tested. There sowing dates were established and data taken included begining of flowering, physiological maturity, duration of reproductive stage, accumulation of heat units, number of pods per plant, seed weight per plant, 1000-seed weight, dry matter and seed yield at harvest. With the exception of yield per plant, volumetric seed weight and dry matter, the response of the genotypes was signifi cant for the other seed yield components and with the interaction between seed yield and planting date. The infl uence of moderate temperatures during the reproductive stage in the first planting date was manifested by an average increase of 22.2 days in the reproductive period as compared to the second and third planting dates. The Hyola 40 1 hybrid was the earliest, more stable, and higher yielder, and the duration of its reproductive stage was not affected across planting dates.

Palavras-chave : Brassica napus L; cultivars; planting dates; yield components; heat units.

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