Mitochondrial ultrastructure in roots of mesophyte and hydrophyte at anoxia and after glucose feeding

Vartapetian, B. B.; Андреева, И. Н.; Kozlova, G. I.; Ls, Agapova

doi:10.1007/bf01281949

Cited by 78 publications

(26 citation statements)

References 21 publications

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“…Nevertheless, when rhizomes were removed from N 2 and further incubated in air, all species showed an increase in O 2 uptake approaching that found in the controls. Thus, it may be surmized that no irreparable damage at the ultrastructural level (Vartapetian, Andreeva, Kozlova and Agapova, 1977) had taken place during the period of 8 d without O 2 .…”

Section: Resultsmentioning

confidence: 99%

Fermentation Rates and Ethanol Accumulation in Relation to Flooding Tolerance in Rhizomes of Monocotyledonous Species

1984

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Fermentation capacity as measured by alcohol dehydrogenase (ADH) and lactate dehydrogenase (LDH) activity were estimated together with ethanol and lactate accumulation over a period of 15 d anoxia in rhizomes of six monocotyledonous species. With the exception of Iris germanica all the species were characteristic wetland plants.Under anoxia an accumulation of ethanol took place in all species. Lactic fermentation was found to be of less importance in every case. The amount of ethanol accumulated depended on the ability of the rhizome to eliminate it from its tissues. Despite great variations in fermentative capacity as seen in the ADH measurements the wetland species did not accumulate ethanol to concentrations greater than 30 /imol g~' fresh weight. This represented a plateau above which the ethanol concentration did not rise even with continued anaerobic incubation. No such plateau of ethanol accumulation was found in the dryland species Iris germanica which accumulated ethanol steadily reaching concentrations of 70/imol g"' fresh weight.If ethanol is toxic to higher plant tissues then the steady state condition of low ethanol accumulation found in wetland species will minimize this danger.

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Section: Resultsmentioning

confidence: 99%

Fermentation Rates and Ethanol Accumulation in Relation to Flooding Tolerance in Rhizomes of Monocotyledonous Species

1984

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“…In addition, tricarboxylic acid cycle intermediates are produced and acetate is readily metabolized under anaerobic conditions (19). Finally, unlike reports for other flood tolerant species (16,23,24,26) 4 min at 2,000g. The pellet was discarded and the supernatant centrifuged for 6 min at 14,500g.…”

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confidence: 88%

Activities of Isolated Mitochondria and Mitochondrial Enzymes from Aerobically and Anaerobically Germinated Barnyard Grass (Echinochloa) Seedlings

Kennedy

Fox²,

Siedow³

1987

Plant Physiol.

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ABSTRACrActivity of mitochondria isolated from whole seedlings of Echinlochca cra-gaii (L.) Beauv. var oryzicola ge ted under aerobic and anaerobic conditions for 5 to 7 days was investigated. Mitochondria (4,14,19,24) appear to play equally important roles. Mitochondrial electron transport may so be an important metabolic consideration not only during anoxia, but also during the transition from anaerobic to aerobic conditions. Reduction of an alternate electron acceptor, such as nitrate (6) or organic acids (5, 8), could permit electron transport in the absence of 02. In support of this hypothesis, we have found that nitrate reserves are depleted in oryzicola seeds during germination (13). Once germinated, the ability to rapidly shift from an anaerobic mode to an aerobic one may be an important metabolic feature during early establishment of this flood tolerant species.In previous studies, we noticed that, unlike rice, germination of oryzicola is inhibited by cyanide and azide (13). In addition, tricarboxylic acid cycle intermediates are produced and acetate is readily metabolized under anaerobic conditions (19). Finally, unlike reports for other flood tolerant species (16,23,24,26), mitochondrial ultrastructure in seedlings germinated under N2 were indistinguishable from those grown in air (1 1

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“…Mitochondria of most plants degenerate or fail to develop properly without oxygen (Ueda and Tsuji 1971;Oliveira 1977;Vartepetian et al 1977). In E. phyllopogon, however, mitochondrial ultrastructure of Nz-grown seedlings is identical to that of seedlings grown in air (Kennedy et al 1980).…”

Section: Introductionmentioning

confidence: 95%

Mitochondrial enzymes in aerobically and anaerobically germinated seedlings of Echinochloa and rice

Fox

Kennedy

1991

Planta

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Activities of tricarboxylic acid (TCA) cycle enzymes in seedlings of barnyard grass (Echinochloa phyllopogon (Stapf.) Koss) and rice (Oryza sativa L.) germinated under aerobic and anaerobic conditions were investigated. In E. phyllopogon, development of TCA-cycle enzyme activities during 10 d of anoxia generally paralleled those in air, although at lower rates. After 5 d, E. phyllopogon seedlings germinating under N2 exhibited 50-80% of the activity of seedlings grown in air, except for 2-oxoglutarate dehydrogenase (EC 1.2.4.2) and fumarate reductase (EC 1.3.1.6) which exhibited only 25-35% of aerobic activity. In anaerobically germinated rice, development of TCA-cycle enzyme activities also paralleled those in air except for aconitase (EC 4.2.1.3), isocitrate dehydrogenase (EC 1.1.1.41), and 2-oxoglutarate dehydrogenase. Those enzymes did not increase in activity under anoxia. Development of maximum enzyme activities generally occurred more rapidly and persisted longer in E. phyllopogon compared to rice. The data indicate that mitochondria of E. phyllopogon function better during anaerobiosis than those of rice and this factor may contribute to the successful "biochemical strategy" of this weed in rice paddies throughout the world.

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Mitochondrial ultrastructure in roots of mesophyte and hydrophyte at anoxia and after glucose feeding

Cited by 78 publications

References 21 publications

Fermentation Rates and Ethanol Accumulation in Relation to Flooding Tolerance in Rhizomes of Monocotyledonous Species

Fermentation Rates and Ethanol Accumulation in Relation to Flooding Tolerance in Rhizomes of Monocotyledonous Species

Activities of Isolated Mitochondria and Mitochondrial Enzymes from Aerobically and Anaerobically Germinated Barnyard Grass (Echinochloa) Seedlings

Mitochondrial enzymes in aerobically and anaerobically germinated seedlings of Echinochloa and rice

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