Effect of temperature and light on seed germination of two legumes
Keywords:
Germination, Neonotonia wightii, Photoblastic, Teramnus labialisAbstract
The main route of propagation of forage legumes is through botanical seeds, so knowing the necessary requirements (temperature and light) during germination is essential to guarantee high germination percentages in the seeds of these species. The objective of this research is to determine the temperature and light requirements (photoperiods) necessary to achieve high germination percentages in the seeds of Teramnus labialis (L.f.) Spreng, cv. “Semilla Oscura” and Neonotonia wightii (Wight & Ann), cvs. “Tinaroo” and “Copper”. Eight constant temperatures (10, 15, 20, 25, 30, 35, 40 and 45ºC) and five different photoperiods (0/24, 6/18, 12/12, 18/6 and 24/0; light hours / darkness) was studies. T. labialis seeds showed their highest germination capacity between 25 and 35ºC, while N. wightii seeds were obtained between 20ºC and 30ºC. No germination was observed for T. labialis at 40ºC, while for N. wightii cultivars it ceased at 35ºC. The optimum germination temperature for T. labialis and N. wightii seeds were 30ºC and 25ºC respectively. The seeds of the two species can be classified as non-photoblastic because the light (photoperiod) did not affect the germination capacity.
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