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Differential Sensitivity of Juglans hindsii, J. regia, Paradox Hybrid, and Pterocarya stenoptera to Waterlogging1

1977; American Society for Horticultural Science; Volume: 102; Issue: 2 Linguagem: Inglês

10.21273/jashs.102.2.101

2327-9788

P. B. Catlin, George C. Martin, Eva Olsson,

Paraquat toxicity studies and treatments

Abstract Seedlings of Juglans hindsii Jeps. and J. regia L. reacted similarly and were much more sensitive to waterlogging at root temperatures of 33°C than those of Pterocarya stenoptera DC. At 23°C, J. regia expressed symptoms of waterlogging earlier than J. hindsii . Paradox plants, hybrids between the 2 walnut species, were more tolerant than J. hindsii but are still considered highly sensitive to anaerobiosis. These results support the contention that use of J. regia seedlings as rootstocks to avoid blackline introduces greater potential for damage if soils become saturated. Some plants of each type which demonstrated increased tolerance have been selected. Levels of abscisic acid, or changes therein did not appear to be useful parameters in screening walnut seedlings for tolerance to waterlogging. Phenolic compounds decreased in roots of waterlogged plants. Although the magnitude of change in phenols was the same in Juglans and Pterocarya plants, it occurred over a much longer period with the latter. Phenols lost from roots may be a secondary phenomenon but contribute to hypersensitivity of Juglans to waterlogging.