PNABD246.pdf

aldolase activity declined in the infected plants during disease development,
while glucose-6-phosphate dehydrogenase activity decreased at the beginning,
then rose in the infected plant when the characteristic symptoms appeared on
the mungbean hypocotyls. Although amylase activity in both healthy and diseased
seedlings showed similar patterns, activity in the diseased plant was always
higher than that in the healthy plant. The data suggest that in the early
stages of attack by Rhizoctonia, the increased amount of reducing sugar present
is caused by a marked reduction of carbohydrate metabolism due to the
inhibition of aldolase and glucose-6-phosphate dehydrogenase activities
accompanied by the enhanced activities of phosphorylase and amylase. In a later
stage of infection, the rapid increase of glucose-6-phosphate dehydrogenase
activity suggests that the hexose monophosphate pathway then plays a major role
in carbohydrate metabolism in the diseased seedlings. [AS]
*0511 Jaganathan, T. ; Narayanasamy, P. ; Palanisamy, A. ; Ranganathan, K.
1974. Studies on the damping-off disease of blackgram (Phaseolus mungo L.).
MADRAS AGRlCTJLTURAL JOURNAL, v.61(6):156-159. [En] [En AbstJ (REP.MB-0416)
A pathogen causing damping-off of blackgram (Vigna mungo) was identified as
Pythium aphanidermatum. An in vitro host range study revealed that Cicer
arietinum, Dolichos biflorus, D. lablab, Vigna radiata and Vigna sinensis could
all be infected by the pathogen. [EMS]
*0512 Tseng, T.C. ; Chang, L.H. 1974. Sclerotium rolfsii phosphatidase B.
1. Inhibition of mung bean initochondrial oxygen uptake by the phosphatidase.
BOTANICAL BULLETIN OF ACADEMIA SINICA, v.15(I):8-13. [Enj [En Abst]
(REP .MB-0284)
Sclerotium rolfsii phosphatidase B, both crude and purified enzymes, was
able to inhibit mungbean mitochondrial oxygen uptake. [ASJ
*0513 Kataria, H.R. ; Grover, R.K. 1975. Effect of chloroneb
(1,4-dichloro-2,5-dinethoxy benzene) and pentachloronitro benzene on metabolLic
activities of Rhizoctonia solani Kuhn. INDIAN JOURNAL OF EXPERIMENTAL BIOLOGY,
v.13(3):281-285. [En] [En Abst] (REP.MB-1554)
Chloroneb and pentachloronitrobenzene (PCNB) inhibited 50% growth of R.
solani at concentrations of 5.0 and 2.5 micromolar respectively. Chloroneb
impaired 02 uptake and reduced mitochondrial and cytochrome c oxidase
activities. PCNB did not inhibit mitochondrial activities but induced leakage
of electrolytes from treated cells. Incorporation of 3H-thymidine and
14C-uracil were reduced by chloroneb only. It appears that chloroneb blocks
electron transport chain, thus disturbing the entire metabolic machinery of
cells while PCNB immobilizes R. solani primarily on account of disruption of
semipermeable membrane and lysis of the cells. [ASJ
*0514 Kataria, H.R. ; Grover, R.K. 1975. Inhibition of infection structures
of Rhizoctonia solani by furgitoxicants. ZEITSCHRIFT FUR PFLANZENKRANKHEITEN
UND PFLANZENSCHUTZ, v.82(4):226-232. [En] [En De Abst] (REP.MB-1312)
The ED50 for mycelial growth of Rhizoctonia solani was lowest in case of
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