eslami, S., afghani, F., mahmoodi, S. (2009). Effects of Some Environmental Factors on Germination and Longevity of Downy Brome (Bromus tectorum) Seeds. , 4(2), 47-57.
sead vahid eslami; fatemeh afghani; sohrab mahmoodi. "Effects of Some Environmental Factors on Germination and Longevity of Downy Brome (Bromus tectorum) Seeds". , 4, 2, 2009, 47-57.
eslami, S., afghani, F., mahmoodi, S. (2009). 'Effects of Some Environmental Factors on Germination and Longevity of Downy Brome (Bromus tectorum) Seeds', , 4(2), pp. 47-57.
eslami, S., afghani, F., mahmoodi, S. Effects of Some Environmental Factors on Germination and Longevity of Downy Brome (Bromus tectorum) Seeds. , 2009; 4(2): 47-57.

Effects of Some Environmental Factors on Germination and Longevity of Downy Brome (Bromus tectorum) Seeds

دانش علف‌های هرز ایران
Article 6, Volume 4, Issue 2, December 2008, Pages 47-57    PDF (250.48 K)
Document Type: Research Article
Authors
sead vahid eslami; fatemeh afghani; sohrab mahmoodi
Abstract
The effects of environmental factors on germination and longevity of downy brome seeds were examined in laboratory and field experiments. Downy brome could germinate in a broad range of temperatures (15/6, 20/10, 25/15, 30/15, and 35/20ºC). The germinability, however, was different depending on the temperature range and the results showed that the highest germination was occurred in 20/10ºC (91%) under continuous dark regime, while the lowest germination percentage was observed in 35/20ºC (5%) under light/dark conditions. Salinity showed significant adverse effect on germination of this weed, so that the highest germinability was at 0 concentration of NaCl (89%). Increased salinity levels significantly decreased downy brome germination and its germination completely ceased at 320 mM NaCl. This study indicated that increasing pH in the range of 4 to 8 resulted in enhanced germination percentage, while further increase of pH significantly reduced germinability. Another experiment in which seeds were after-ripened at different depths in the field showed that increased burial depths from 0 to 10 cm accelerated seed after ripening and the lowest germination occurred in the seeds which were placed on the soil surface.
Keywords
acidity; After-ripening; Germination; Salinity
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