INVESTIGADORES
BENTIVEGNA Diego Javier
artículos
Título:
Influence of environmental factors on seed germination and emergence of Iresine diffusa
Autor/es:
ACOSTA J.M.; BENTIVEGNA D. J.; PANIEGO E.; DELLAFERRERA I.; ALISO M; PERRETA M
Revista:
WEED RESEARCH
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2014 vol. 54 p. 584 - 592
ISSN:
0043-1737
Resumen:
Iresine diffusa has become more abundant under no-till soybean in Argentina. The influence of 30 temperature, light, cold-wet storage, osmotic potential, dry storage and depth of seed burial 31 on germination and emergence of I. diffusa were examined in a growth chamber experiment. 32 Iresine difussa seeds germinated at the highest proportion (> 0.80) in all fluctuating day/night 33 temperature tested. Conversely, under a constant temperature regime, maximum 34 germination rates occurred at 15 ºC (0.78) and 20ºC (0.82), and minimum germination rates 35 occured at 10 ºC (0.19) and 30ºC (0.36). While seed germination was not influenced by light 36 exposure, it was affected after 12 (0.76) and 16 (0.65) weeks in cold-wet storage. To reduce 37 germination significantly, -0,4 MPa of osmotic potential (induced by PEG-6000) or 120 mM of 38 salt (NaCl) concentration were required. Seeds of I. diffusa showed high viability (0.85) after 39 720 days of dry storage. Low emergence was recorded for seeds buried at 2 cm, and seedling 40 emergence was completely inhibited when seeds were buried at 5 and 10 cm. Iresine diffusa 41 seeds had high viability and were capable of emerging in a broad range of environmental 42 conditions. The thermal germination conditions, shallow soil depths and high moist conditions 43 in germination phase for Iresine diffusa are congruent with the conditions in Argentina no-44 tillage soybean. Thus, no-tillage could provide better conditions for germination than 45 conventional tillage systems. Additionally, salt tolerance levels indicate that in saline soils 46 seeds could germinate. These results explain, in part, why I. diffusa has increased in no-till 47 soybean systems over the last decade and become a problematic weed.