Selection and characterization of wheat genotypes for saline soils prone to water‐logging
| Autor: | Muhammad Nasim, R. H. Qureshi, Javaid Akhtar, Muhammad Saqib |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Journal of Plant Nutrition and Soil Science. 176:131-137 |
| ISSN: | 1522-2624 1436-8730 |
| DOI: | 10.1002/jpln.201200011 |
| Popis: | Wheat (Tritcum aestivum L.) genotypes were screened and characterized for performance under salt stress and/or water-logging. In a solution-culture study, ten wheat genotypes were tested under control, 200 mM–NaCl salt stress and 4-week water-logging (nonaerated solution stagnated with 0.1% agar), alone or in combination. Shoot and root growth of the wheat genotypes was reduced by salinity and salinity × water-logging, which was associated with increased leaf Na+ and Cl– concentrations as well as decreased leaf K+ concentration and K+ : Na+ ratio. The genotypes differed significantly for their growth and leaf ionic composition. The genotypes Aqaab and MH-97 were selected as salinity×water-logging-resistant and sensitive wheat genotypes, respectively, on the basis of their shoot fresh weights in the salinity × water-logging treatment relative to control. In a soil experiment, the effect of water-logging was tested for these two genotypes under nonsaline (EC = 2.6 dS m–1) and saline (EC = 15 dS m–1) soil conditions. The water-logging was imposed for a period of 21 d at various growth stages, i.e., tillering, stem elongation, booting, and grain filling alone or in combinations. The maximum reduction in grain yield was observed after water-logging at stem-elongation + grain-filling stages followed by water-logging at grain-filling stage, booting stage, and stem-elongation stage, respectively. Salinity intensified the effect of water-logging at all the growth stages. It is concluded that the existing genetic variation in wheat for salinity × water-logging resistance can be successfully explored using relative shoot fresh weight as a selection criterion in nonaerated 0.1% agar–containing nutrient solution and that irrigation in the field should be scheduled to avoid temporary water-logging at the sensitive stages of wheat growth. |
| Databáze: | OpenAIRE |
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