Seed germination response of Haloxylon persicum (Chenopodiaceae) to different hydrothermal conditions and sand burial depths
Daily counts of germinated seeds of white saxaul (Haloxylon persicum) incubated at 35 different hydrothermal environments (10-25°C and 0 to -3 MPa) were carried out under controlled laboratory conditions. The seeds were then buried in sand at 4 different depths in well drained pots constantly moi...
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| Format: | Article |
| Language: | English |
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University of Guilan
2011-05-01
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| Series: | Caspian Journal of Environmental Sciences |
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| Online Access: | https://cjes.guilan.ac.ir/article_1061.html |
| Summary: | Daily counts of germinated seeds of white saxaul (Haloxylon persicum) incubated at 35 different
hydrothermal environments (10-25°C and 0 to -3 MPa) were carried out under controlled laboratory
conditions. The seeds were then buried in sand at 4 different depths in well drained pots constantly
moisturized for three weeks. In all these hydrothermal conditions, the courses of germination were
completed in less than 12 days. Both temperature and water deficit conditions significantly affected the
seed germination. Water potential values of -1.5 MPa reduced the germination percentage to less than one
fourth of the potential viability in all ambient temperature regimes and seed germination almost
completely ceased at water deficit of -3 MPa. As water potential decreased from 0 to -1.5, base temperature
values slightly increased from 5.4 to 6.5 °C. Six-cm depth of burial was enough to reduce germination by
50% and on an average 85% of germinated seeds at 8-cm depth failed to reach the soil surface. No seedling
appeared on top of the sand bed in pots labeled "12-cm burial depth". |
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| ISSN: | 1735-3033 1735-3866 |