The Hexose Monophosphate Shunt as the Major Respiratory Pathway During Sporulation of Rust of Safflower.

Daly, J.M.; Sayre, R. M.; Pazur, John H.

doi:10.1104/pp.32.1.44

Cited by 65 publications

(23 citation statements)

References 2 publications

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“…In general, during conidiophore differentiation the PP pathway enzymes were higher in activity than the EMP pathway enzymes and when considered with the radiorespirometric results strongly imply that the direct oxidation of glucose through the PP pathway may be of considerable importance during conidiophore development in Aspergillus niger. These observations are in substantial agreement with other studies on glucose catabolism during fungal differentiation (Daly et al 1957;Turian, 1962;McDowell & DeHertogh, 1968;Carter & Bull, 1969)~ and would indicate a major role for the PP pathway and its intermediary products (pentoses, NADPH2) during differentiation.…”

Section: Discussionsupporting

confidence: 82%

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Changes in Carbon Catabolic Pathways during Synchronous Development of Conidiophores of Aspergillus niger

Smith

Anderson

1972

Journal of General Microbiology

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S U M M A R YCarbon catabolism was studied during the synchronous development of conidiophores of Aspergillus niger. The activities of key enzymes of the Embden-MeyerhofParnas (EMP) and pentose phosphate (PP) pathways were measured and studies of 14C0, production from [ 1-14C]-and [6-14C]glucose were made. The enzyme activities together with the radiorespirometric studies showed that both the EMP and PP pathways were present and operative at all stages of conidiophore development but that the relative activities of the pathways differed. The highest activity of the EMP pathway occurred during the initial period of vegetative growth before any signs of morphological change, High EMP activity and high 6-C/1-C ratios were obtained in a medium which did not support conidiophore initiation but allowed vegetative growth to occur. In contrast, high activity of the PP pathway and very low 6-C/ I-C ratios accompanied each stage of conidiophore development. The results suggest that the PP pathway predominates during conidiophore development of this fungus.

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Section: Discussionsupporting

confidence: 82%

“…Similarly, an active PP pathway was found to operate throughout conidiogenesis in Neurospora crassa (Turian, I 962), while Daly, Sayre & Pazur (1957) have demonstrated that the PP pathway was the major respiratory pathway during conidiation of the obligate rust fungus Puccinia carthami growing on safflower.…”

Section: Introductionmentioning

confidence: 99%

Changes in Carbon Catabolic Pathways during Synchronous Development of Conidiophores of Aspergillus niger

Smith

Anderson

1972

Journal of General Microbiology

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“…They concluded that both light and (lark reactions were similarly affectecl, probably by a (lirect effect of virus within the chloroplasts. Previous studies of rust affected tissues (6,7,9) have shown an oxidative pentose-phosphate sequence is of considerable importance in respiration (luring the stages when photosynthesis is inhibited strongly. Respiratory (listurbance of steady-state levels of redox cofactors or the increased activity of shared enzyme systems might be a contributing factor through inhibition of dark reactions of photosynthesis rather than the light reactions related to chlorophyll concentrations.…”

Section: Methodsmentioning

confidence: 99%

“…An appreciable rise in respiration was detected when symptoms first wvere apparent but the highest rates were recorded when the fungus was sporulating (6,9,15,19). During this prolonged period of catabolic activity, a further requirement for carbon is imposed on the infected tissue because of an appreciable increase in wveight and/or size, as a consequence of various synthetic activities.…”

Section: Introductionmentioning

confidence: 99%

Photosynthesis in Healthy and Rust-Affected Plants

Livné

1964

Plant Physiol.

120

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“…Accompanying this decline in photosynthesi!s is a marked increase in the rate of respiration (16). Decreased C6:C1 ratios (4,17) and increased activities of glulcose-6-P dehydrogenase and 6-P-gluconate dehydrogena,se (16) indicate that the activity of the pento-se-P pathway is increased after iftfection.…”

mentioning

confidence: 99%

Metabolic Regulation in Diseased Leaves II. Changes in Nicotinamide Nucleotide Coenzymes in Barley Leaves Infected With Powdery Mildew

Ryrie

Scott

1968

Plant Physiol.

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A bstract. Nicotinamide nucleotide coenzymes were estimated spectrophotometrically in noninfected barley leaves and leaves infected with Erysiphe graminis var hordei (powdery mildew). Amounts of NADH, NADP+ and NADPH were not altered by infection. In contrast, the NAD+ content rose sharply and at 144 hours was 100 %v greater than in noninfected leaves. The respiratory rate was increased in infected leaves and the pattern of this increase was similar to that of NAD+.The effect of infection on 'the intracellular distribution of NADP+ was examined by fraotionating lyophilized leaves in a nonaqueous medium. In noninfected leaves almost all of the NADP+ was localized in the chloroplasts. In infected leaves where some dhloroplast breakdown occurs, about 60 % of the NADP+ was detected in the nonchloroplast part of the cell. Tihis intracellular redistribution of NADP+ is discussed in relation to the increased pentose-P pathway activity occurring after infection.Changes occur in photosynthesis and respiration in cereal leaves after infection with rtusts (8,17) and powdery mildews (11, 16). Comimencing 2 days after inoculaition of barley leaves with powdery mildew, the rate of photosynthesis failis of'f sharply (16). Accompanying this decline in photosynthesi!s is a marked increase in the rate of respiration (16). Decreased C6:C1 ratios (4, 17) and increased activities of glulcose-6-P dehydrogenase and 6-P-gluconate dehydrogena,se (16) indicate that the activity of the pento-se-P pathway is increased after iftfection.The deciline in photosyn,thesis 'and the respiratory increa,se are 'linked, since neitther respiration nor the activities of the pentose-P pathway de'hydrogenases were increased by in-fecting suisceptible etiolated plants (112,16). Fuirther, experiments on a stusceptible mu'tant producing ehloroplasts only when grown in the light above 130 showed that the characteristic rise in respiration developed after infecting leaves containing chiloroplasts (grown at 150 in the light) but not in infected leaves lacking chIloroipla,sts (grown a't 110 in the light).The respiratory activity of inifected 'leaves may be affecited by changes in amounts of oxidized and reduced nicotinamide coenzyimes. These changes could resuilt from impaired photo'synthesis or even from leakage olf coenzymes from degenerating plastids. The availlability of NA,DP+ is known to limit pentose-P palthway activity in other plant material (1, 2), and an increase in the cytoplasmic concen-

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The Hexose Monophosphate Shunt as the Major Respiratory Pathway During Sporulation of Rust of Safflower.

Cited by 65 publications

References 2 publications

Changes in Carbon Catabolic Pathways during Synchronous Development of Conidiophores of Aspergillus niger

Changes in Carbon Catabolic Pathways during Synchronous Development of Conidiophores of Aspergillus niger

Photosynthesis in Healthy and Rust-Affected Plants

Metabolic Regulation in Diseased Leaves II. Changes in Nicotinamide Nucleotide Coenzymes in Barley Leaves Infected With Powdery Mildew

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