Environmental conditions of temperature and light were verified for diaspore germination in Borreria verticillata, Cayaponia martiana, Echinodorus grandiflorus, Ocimum selloi, Plantago australis, Polygonum hydropiperoides and Waltheria douradinha. Germination was carried out in Petri dishes, using 1% agar as substrate, or in gerbox containing sand, which were placed into BOD chambers at constant temperatures of 10 and 15ºC in the absence of light or at 20, 25, 30 and 35ºC in the absence or presence of white light. Alternate temperatures of 10-20ºC, 15-25ºC, 20-30ºC, 25-35ºC were also tested, as well as the highest temperature in the presence of light during 9 hours/day. B. verticillata, E. grandiflorus and P. australis showed positive photoblastic seeds, whereas O. selloi seeds behaved as relative positive. C. martiana and W. douradinha seeds were classified as non-photoblastic. P. hydropiperoides seeds were obligatorily dependent on variable temperatures, whereas in the remaining species, germination at variable or constant temperatures was similar.
Borreria verticillata; Cayponia martiana; Echinodorus grandiflorus; Ocimum selloi; Plantago australis; P. hydropiperoides; W. douradinha
