Resumen

ROMERO-BASTIDAS, Mirella et al. Termopriming on germination, seedling emergence and seedling vigour of basil seeds (Ocimum basilicum L.). Nova scientia [online]. 2016, vol.8, n.16, pp.181-212. ISSN 2007-0705.

Worldwide the economic importance of basil (Ocimum basilicum L.) has prompted the search for strategies, such as seed conditioning in order to improve the indices of vigour of the plant with respect to improving yield, quality and tolerance to some types of stress. The aim of this study was to determine the optimal threshold conditioning of the seeds needed with different temperature gradients on the characteristics of vigour related to morphometric and physiological variables of basil seedlings during the stages of germination, emergence and early vegetative growth. Basil seeds of the Nuffar variety were subjected to thermal conditioning treatments by exposure to dry heat using four temperature gradients (40, 50, 60 and 70 °C) and different time intervals (30, 60 and 90 min), as well as a control (25 °C) treatment. A completely randomized design was carried out with factorial arrangement with four and/or five repetitions. The results showed that the temperature and exposure times significantly (p ≤ 0.05) affected rates and percentages of germination and emergence, as well as the morphometric and physiological variables of the plant. In the germination stage, the treatment of 70 °C negatively affected the plant response in all variables, regardless of exposure times, while treatments 40, 50 and 60 °C were equal to control. In the emergence stage, the 60 °C treatment with an exposure time of 60 min significantly improved the different characteristics of vigour. However, the treatment at 70 °C caused a decrease in the different variables evaluated. In addition, during the early vegetative stage, exposure to 60 °C for 30 and 60 min significantly improved morphological and physiological variables of the plants compared to the control and other treatments.

Palabras llave : termal conditioning; germination; emergence; vigour; early vegetative growth.

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