PJB-2019-871
Assessing environmental factors on seed germination of sea barley Hordeum marinum huds.
Javid Gherekhloo
Abstract
Sea barely is annual weed among the most troublesome weedy grass in northern Iran winter crops. This study investigated the germination of sea barley in response to water potentials, salinity, pH levels, waterlogging and heat stress and also seedling emergence in response to burial depth. Result have shown that seed germination reduced by increase of osmotic potential and salinity, X50 for 0 to -1 Mpa of osmotic potential was 17.8 to 83.1days and for 0 to 200 Mm NaCl of salinity condition was 17.8 to 70.8 days, respectively. Higher seed germination (> 65%) was observed in the range of pH 6 to 7 than the other tested pH levels and did not germinated at alkali levels. Heat stress had a significant effect on seed germination and it was completely inhibited of seeds placed in all temperatures and durations. Sea barley seeds have 50 % germination for >40 days after placing in waterlogging condition. Highest emergence was occurred at 1-2 cm. The results of this study will help to develop significantly actions to reduce sea barley recruitment and distribution; and management techniques can be applied accordingly to minimize its productivity.
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