Journal
NEW PHYTOLOGIST
Volume 151, Issue 2, Pages 369-380Publisher
WILEY
DOI: 10.1046/j.1469-8137.2001.00183.x
Keywords
adventitious roots; aerenchyma; Lophopyrum elongatum; radial O-2 loss; waterlogging; wheat (Triticum aestivum)
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Waterlogging tolerance and its physiological basis were evaluated in Lophopyrum elongatum (a species from a salt marsh habitat), Triticum aestivum (cv. Chinese Spring), their amphiploid, and disomic chromosome addition lines. Growth in drained or waterlogged soil and aerated or deoxygenated stagnant nutrient solution were evaluated, Porosity, aerenchyma, rates of O-2 consumption, radial O-2 loss, and ethanolic fermentation in adventitious roots of selected genotypes were also measured. L. elongatum was more tolerant of deoxygenated stagnant nutrient solution or waterlogged soil 0-48% reductions in growth, respectively) than 'Chinese Spring' (63-84% reductions), the amphiploid (49-81% reductions), or the addition lines (56-92% reductions). Roots of L. elongatum had a higher constitutive porosity than 'Chinese Spring', resulting in greater internal O-2 movement in these roots when intact plants were first transferred to an O-2-free root medium. This trait, as well as the slower growth and development of L. elongatum, might have contributed to its greater waterlogging tolerance. Despite the differences between L. elongatum and 'Chinese Spring' in some traits, none of the Lophopyrum x wheat lines showed substantial improvement in waterlogging tolerance.
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