Ethanolic fermentation, the predominant catabolic pathway in @entity519 -tolerant @entity579 coleoptiles, was manipulated in excised and 'aged' tissues via @entity413 feeding. Coleoptiles with exogenous @entity413 survived 60 h of @entity519 , as evidenced by vigorous rates of K+ and @entity1391 net uptake and growth of roots and shoots when re-aerated. In contrast, coleoptiles without exogenous @entity413 showed net losses of K+ and @entity6546 starting 12 h after @entity519 was imposed and these did not recover fully when re-aerated after 60 h of @entity519 . @entity1068 production (micromol x g(-1) FW x h(-1)) declined from about 7.5 during the first 12 h of @entity519 to 5 or 2.2 after 48-60 h, in coleoptiles with or without exogenous @entity413 , respectively. @entity1735 concentrations changed only slightly in anoxic coleoptiles with exogenous @entity413 due to net @entity413 uptake at 2.6 micromol x g(-1) FW x h(-1). Ethanolic fermentation, and therefore @entity855 production, may have been down-regulated after an initial period of acclimation to @entity519 in coleoptiles with exogenous @entity413 . Maintenance requirements for energy were assessed to be 3.4-7.6-fold lower in these anoxic coleoptiles than published estimates for non-growing aerated leaf tissues. A modest part of the required economy in energy consumption would have been derived from diminished ion transport; @entity519 reduced K+ and @entity1391 net uptake by 70-90% in these coleoptiles. K+ efflux was 10-fold lower in anoxic than in aerated coleoptiles with exogenous @entity413 . Using the unidirectional efflux equation, the membrane permeability to K+ was estimated to be 17-fold lower in anoxic than in aerated coleoptiles, presumably due to predominantly closed K+ channels.

Evidence for down-regulation of ethanolic fermentation and K+ effluxes in the coleoptile of @entity579 seedlings during prolonged XXXX .

@entity6546 :: ('MESH:D010710', 'Chemical') :: ['phosphates'] @entity1735 :: ('CHEBI:16646', 'Chemical') :: ['Carbohydrate'] @entity519 :: ('MESH:D000860', 'Disease') :: ['anoxia'] @entity1391 :: ('CHEBI:26020', 'Chemical') :: ['phosphate'] @entity579 :: ('4530', 'Species') :: ['rice'] @entity1068 :: ('MESH:D000431', 'Chemical') :: ['Ethanol'] @entity413 :: ('MESH:D005947', 'Chemical') :: ['glucose'] @entity855 :: ('MESH:D000255', 'Chemical') :: ['ATP']
@entity519 :: (MESH:D000860,Disease) :: ['anoxia']
