Pollen traps were set for 5 days during the flowering
period to coincide with weather data. The traps were set
at 50 m intervals from the GM plot in four compass directions
(N, S, W and E) up to 400 m. The pollen trap comprised
a clamp on a pole with a glass slide coated with Tween20, adjusted to a height of 1.8 m to match the height
of flowering maize. The glass slides were placed in the
clamp at 6:00 a.m. and removed at 3:30 p.m. daily, for 5
days. Pollen was retrieved from the slides by rinsing them
with 1 ml cetyltrimethylammonium bromide (CTAB) buffer
(20 g/l CTAB, 1.4 M NaCl, 0.1 M Tris/HCl and 20 mM
EDTA, pH 8), after which, it was stored at 4°C. Pollen was
diluted (1:10) and counted using a haemocytometer using
a light microscope under 10 × magnification.
Pollen traps were set for 5 days during the floweringperiod to coincide with weather data. The traps were setat 50 m intervals from the GM plot in four compass directions(N, S, W and E) up to 400 m. The pollen trap compriseda clamp on a pole with a glass slide coated with Tween20, adjusted to a height of 1.8 m to match the heightof flowering maize. The glass slides were placed in theclamp at 6:00 a.m. and removed at 3:30 p.m. daily, for 5days. Pollen was retrieved from the slides by rinsing themwith 1 ml cetyltrimethylammonium bromide (CTAB) buffer(20 g/l CTAB, 1.4 M NaCl, 0.1 M Tris/HCl and 20 mMEDTA, pH 8), after which, it was stored at 4°C. Pollen wasdiluted (1:10) and counted using a haemocytometer usinga light microscope under 10 × magnification.
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