Figure 6.

Morphological (A, C and E) and infrared thermograph images (B, D and F) of bromeliads exposed to varying temperatures. (A and B) Acanthostachys strobilacea (Schult. f.) Link, Klotzsch & Otto plants of approximately one month old exposed to 32°C for seven days. (C-F) Nidularium minutum Mez plants of five months old exposed to 25°C (C and D) and 10°C (E and F) for 10 days. Thermographs taken with an infrared camera allows the qualitative assessment of surface temperature of leaves and roots. Overall, it is possible to verify that plants under exposure to higher temperatures (25-32°C) were able to keep roots with lower temperatures than the leaves. Meanwhile, N. minutum plants under cold stress (10°C) kept roots with higher temperatures than the leaves. All thermographs were obtained with a Testo 875-1i infrared camera (Lenzkirch, Germany). Bars: (A) 2 cm, (C and E) 3 cm. Photo credits: (A, B) William T. Hagiwara; (C-F) Camila P. Carvalho.