Experiments were carried out in 1995-97 in a north-western Italian rice area with the objective of studying germinability and shattering capacity evolution after flowering of red rice seeds and to determine the longevity of the weed seeds buried within rice field soils. Germinability and shattering capacity evolution was studied by considering panicles of red rice plants grown together with the plant. Starting from 6 days after flowering (DAF), panicles were collected for 1 month, at 7 and 3-day intervals, in 1995 and 1996-1997 respectively, and tested for their capacity to germinate 90 days after the last collection. The red rice seeds started to be able to germinate and to shatter already 9 DAF, after which germinability and shattering showed a great increase: at 21 DAF these parameters reached about 55-70% and 15-20%, respectively. Seed longevity was studied over the 1995-1996 period, by burying 8 wire cages containing 1,000 seeds each at a depth of 40 cm. After 12 and 24 months of burial the cages were dug up and the seeds were tested for the capacity to germinate. The number of germinated seeds reduced from 91% before burial to 6% after 1 year and 5% after 2 years.
Germinability after flowering, shattering ability and longevity of red rice seeds
FERRERO, Aldo;VIDOTTO, Francesco
1998-01-01
Abstract
Experiments were carried out in 1995-97 in a north-western Italian rice area with the objective of studying germinability and shattering capacity evolution after flowering of red rice seeds and to determine the longevity of the weed seeds buried within rice field soils. Germinability and shattering capacity evolution was studied by considering panicles of red rice plants grown together with the plant. Starting from 6 days after flowering (DAF), panicles were collected for 1 month, at 7 and 3-day intervals, in 1995 and 1996-1997 respectively, and tested for their capacity to germinate 90 days after the last collection. The red rice seeds started to be able to germinate and to shatter already 9 DAF, after which germinability and shattering showed a great increase: at 21 DAF these parameters reached about 55-70% and 15-20%, respectively. Seed longevity was studied over the 1995-1996 period, by burying 8 wire cages containing 1,000 seeds each at a depth of 40 cm. After 12 and 24 months of burial the cages were dug up and the seeds were tested for the capacity to germinate. The number of germinated seeds reduced from 91% before burial to 6% after 1 year and 5% after 2 years.
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