Resumen

PEREZ MENDOZA, Claudia; TAVITAS FUENTES, Leticia; AYALA AGUILERA, Líder  y  OVIEDO DE CRISTALDO, Rosa María. Effect of different temperatures on physiological quality of sesame seeds. Investig. Agrar. [online]. 2015, vol.17, n.2, pp.122-128. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2015.diciembre.122-128.

During seeds germination process, they may mainly be affected by the availability of water, temperature and light, which all influence germination. The objective of the study was to evaluate physiological quality of five sesame seeds genotypes subjected to different temperatures. The study was carried out using five sesame seeds genotypes produced in Paraguay. The research had two phases: in the first phase, seeds physical quality was evaluated and in the second one, seeds physiological quality. The experimental design was a completely randomized bifactorial arrangement with four replications, totaling 80 experimental units. The variables evaluated were seeds genotype, called factor A (Kemasen,SH1, Escoba, Negro Paraguay and Dorado) and temperature, called Factor B (four levels: 20°C, 25°C, 30°C and 35°C) Results showed that one thousand seeds yielded between 2.29 to 2.92 g weight  being Kemasen the most outstanding genotype; Regarding physiological quality, Negro Paraguay, Kemasen and Escoba genotypes had the highest germination rate, both on the first and the last  counting. As for the effect of temperature, it was observed that germination was better under temperatures of 25ºC and 30°C compared to temperatures of 20ºC and 35°C. It is concluded that germination rate and seedlings total dry weight depended more on seed genotype. Temperatures of 25ºC to 30°C are the best one for highest germination rate of Paraguayan sesame seed genotypes; The best physical as well as physiological quality were achieved by Negro Paraguay and Kemasem genotypes.

Palabras clave : Sesamum indicum; physical quality; physiogical quality.

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