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Publication Type J
Authors Ahmed, M. Z., S. Gulzar and M. A. Khan
Title Role of Dormancy Regulating Chemicals in Alleviating the Seed Germination of Three Playa Halophytes
Source Ekoloji
Author Keywords Dormancy Gibberellin Kinetin Nitrate Playa halophytes Prolific Salinity and Thiourea salinity stress allenrolfea-occidentalis growth-regulators relieving compounds lepidium-sativum abscisic-acid temperature thiourea fusicoccin osmotica
Abstract The effects of dormancy regulating chemicals [nitrate, thiourea, prolific, kinetin and gibberellin (GM)] were tested on the seed germination of three salt playa halophytes, Halogeton glomeratus, Lepidium and Peganum harmala under various salinity treatments (0 to 400 mM NaCl) and photoperiod regimes (12/12 h light/dark and 24 Is dark). More than 80% of all seed species germinate under non-saline conditions in a 12/12 h light/dark photoperiod. However, there was a progressive increase in the enforced dormancy with an increase in salinity treatments. Thiourea substantially improved seed germination and the rate of germination of all test species under saline conditions. Kinetin partially alleviated the salinity effect on the seed germination of H. glomeratus and P harmala but not for L. latifolium. GM substantially improved the seed germination in L. latifolium. Nitrate and proline had no effect under saline conditions. Seed germination was completely inhibited in L. latifolium, partially in P harmala, but had no effect on H. glomeratus seeds when germinated in the dark. GM alleviated dark inhibition in the order: L. latifolium > P harmala > H. glomeratus. Species specific responses to GM and kinetin and environmentally mediated responses of thiourea appear to influence the seed germination of the salt playa species.
Author Address [Ahmed, Muhammad Zaheer; Gulzar, Salman; Khan, M. Ajmal] Univ Karachi, ISHU, Karachi 75270, Pakistan. [Khan, M. Ajmal] Qatar Univ, Coll Arts & Sci, Dept Int Affairs, Qatar Shell Professorial Chair Sustainable Dev, Doha, Qatar. Khan, MA (reprint author), Univ Karachi, ISHU, Karachi 75270, Pakistan. ajmal.khan@qu.edu.qa
ISSN 1300-1361
ISBN 1300-1361
29-Character Source Abbreviation Ekoloji
Year Published 2014
Volume 23
Issue 92
Beginning Page 1-8
Digital Object Identifier (DOI) 10.5053/ekoloji.2014.921
Unique Article Identifier WOS:000348465300001
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