Response of potato tubers to hypoxia followed by re-aeration

Abstract

Potato tubers kept under hypoxia (1%) showed improved viability in comparison to anoxia, which was associated with the maintenance of intermediate adenvlate ener,w charge values (A.E.C. = 0.6) and stable adenylate pools at 50% of the initial levels. Re-admission of oxygen to the tuber resulted in an almost full recovery of adenylate energy charge and total adenylates after up to 3 days of hypoxic pretreatment. Tubers exhibited a mixed fermentation. The high lactate. ethanol and acetaldehyde levels proved to be non toxic. Ethanol was degraded to acetaldehyde during re-aeration. Posthypoxic lipid peroxidation was indicated by malondialdehvde and ethane formation. Both products occurred with a temporary delay and in lower amounts compared to post-anoxia. Ethylene release was also considerably smaller. Severe hypoxia and posthypoxia postponed tissue death compared to anoxia. Survival was correlated with an improved energy supply which stabilized membranes.

Re-Aeration following Hypoxia or Anoxia Leads to Activation of the Antioxidative Defense System in Roots of Wheat Seedlings1

“…In agreement with our results, Pfister- Sieber and Brändle (1995) and Sieber and Brändle (1991) demonstrated an improved viability of potato tubers under hypoxia compared with anoxia and attributed this to the ability of maintaining the energy charge at an intermediate level under hypoxia, whereas anoxic tubers revealed the complete breakdown of energy metabolism.…”

“…Under hypoxic conditions the respiratory chain is not fully inhibited (Pradet and Bomsel, 1978); therefore, plants can partially maintain their energy charge by residual respiration (Pfister-Sieber and Brändle, 1995). Flushing only the root environment with nitrogen resulted in acclimatization of young wheat plants, including anatomical and biochemical changes.…”

Induction of mitochondrial aldehyde dehydrogenase by submergence facilitates oxidation of acetaldehyde during re‐aeration in rice

“…Post‐hypoxic acetaldehyde accumulation has been reported in several plants [6,11,12], and may be a result of oxidation of ethanol by ADH and/or CAT or decarboxylation of pyruvate by PDC (Fig. 1).…”

“…Re‐aeration also induces the production of acetaldehyde, as a result of oxidation of ethanol, which is produced and accumulated by ethanolic fermentation under low‐oxygen conditions (Fig. 1 ) [11,12]. Ethanol is assumed to be rapidly oxidized to acetaldehyde by alcohol dehydrogenase (ADH) and/or catalase (CAT) (Fig.…”

Reducing Unavoidable Nutrient Losses from Florida's Horticultural Crops

“…These crops are mesophytes, requiring oxygen to the root zone due to lack of adaptation to saturated soils. Saturated soils exclude oxygen leading to anoxic conditions, and persistent refilling of the root zone with water can cause hypoxic conditions with oxygen falling to levels insufficient for aerobic respiration (Davies, 1980;Pfister-Sieber and Brandle, 1995). The flooding response of mesophytes has been extensively reviewed (Bailey-Serres and Chang, 2005;Kozlowski, 2002;Schaffer et al, 1993;Vartapetian and Jackson, 1997;Vartapetian et al, 2003).…”