Effects of early aging, polyethyleneglycol and substrates on the viability and vigour of mesquite seeds
The aim of this work was to investigate the field performance, water stress resistance and vigour of mesquite (Prosopis juliflora Sw (D.C.)) seeds. The experiments were carried out with four simultaneous replications of 50 seeds previously scarified with sulfuric acid for five minutes and the data were submitted to variance analysis and Tukey's test. Viability test was made with seeds having brown, yellow and brown-yellow coats, recording germinability of 99.5; 43.5 and 12.0%, at the rate of 0.97; 0.55 and 0.48 days-1, respectively. When seeds of hight, intermediate and dark brown coat were exposed to accelerated aging, only seeds with dark brown coats did not resist. A water stress was simulated with PEG 6000 in seeds with yellow and brown-yellow coat. In the first ones, a significant reduction of the rate was verified at -0.4 MPa, and in the germinability at -1.0 MPa, and in the late ones at -0.4 MPa. The seedlings emerged from yellow seeds at different PEG concentrations presented a reduction in the phytomass epigeal/hypogeal rate starting at -0.2 MPa.
| Main Authors: | , |
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| Format: | Digital revista |
| Language: | por |
| Published: |
Pesquisa Agropecuaria Brasileira
1998
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| Online Access: | https://seer.sct.embrapa.br/index.php/pab/article/view/5023 |
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