Boosting underwater germination in Echinochloa colona seeds: the impact of high amplitude alternating temperatures and potassium nitrate osmopriming

ECHEVERRY J; CREPY M; STRIKER GG; MOLLARD FPO

FUNCTIONAL PLANT BIOLOGY

CSIRO PUBLISHING

Lugar: Collingwood; Año: 2023

1445-4408

Underwater germination could risk seedling survival suggesting the need for control through seed perception of environmental cues. These cues include diurnally alternating temperatures tied to drained soils or shallow water tables. We examined high-amplitude alternating temperatures impact on underwater germination. Besides, the conditions experimented by seeds in the soil (e.g., hydration/dehydration phases) change their germinability so we tested if osmopriming could affect underwater germination. We worked with Echinochloa colona (L.) Link seedlots from extensive crop fields, exposing seeds to sequential submergence and drained treatments in combination with cues that promote germination. While a 10ºC difference between maximum and minimum daily temperatures maximized germination in drained conditions, higher amplitudes (>15ºC) alternating temperatures promoted E. colona underwater germination under hypoxic water (pO2