Carbohydrate metabolism in growing rice seedlings under arsenic toxicity

Jha, Alok; Dubey, R. S.

doi:10.1016/j.jplph.2004.01.004

Cited by 122 publications

(67 citation statements)

References 23 publications

(18 reference statements)

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“…Moreover, the inhibition of biomass accumulation may also result from inhibition of cell division resulting in the decline in growth [45]. At higher As concentrations it might be due to the reduced enzyme activity [46][47][48] and/or the As-induced oxidative stress [39,48].We have also been observed in our earlier studies, as influenced by heavy metals induced oxidative stress in Indian mustard by modulation of antioxidant enzymes [49][50][51][52][53][54][55][56][57].…”

Section: Discussionmentioning

confidence: 65%

Screening Indian Mustard Genotypes for Phytoremediating Arsenic‐Contaminated Soils

Ansari

Shao

Umar

et al. 2012

CLEAN Soil Air Water

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Ten Indian mustard (Brassica juncea L.) genotypes were screened for their phytoremediation potential for arsenic (As) contaminated water under laboratory-controlled conditions. The genotypes were grown in a hydroponic chamber for 20 days in 250-mL beakers containing As-contaminated water. During plant development, changes in plant growth, biomass, and total As were evaluated. Of the 10 genotypes (Pusa Agrani, BTO, Pusa Kranti, Pusa Bahar, Pusa Bold, Pusa Basant, Pusa Jai Kisan, Arka Vardhan, Varuna, and Vaibhav) Pusa Jai Kisan was the most effective in phytoremediating Ascontaminated water under hydroponic conditions. This will provide new information for Indian mustard genotypes for phytoremediating As-contaminated soils.

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Section: Discussionmentioning

confidence: 65%

Screening Indian Mustard Genotypes for Phytoremediating Arsenic‐Contaminated Soils

Ansari

Shao

Umar

et al. 2012

CLEAN Soil Air Water

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“…In our earlier studies, reduced activities of acid and alkaline invertases were also reported in the growing tissues of the cadmium stressed seedlings (Devi et al 2007). Jha and Dubey (2004) had also reported a reduced acid invertase activity in rice seedlings under arsenic toxicity. Low activity of SPS in the roots and shoots of stressed seedlings showed that sucrose synthesizing capacity is down regulated in these tissues under Pb toxicity.…”

Section: Discussionmentioning

confidence: 96%

“…Glucose-6-PO 4 dehydrogenase (G6PDH, EC 1.1.1.49) and 6-phosphogluconate dehydrogenase (6PGDH, EC 1.1.1.44) are the key enzymes of this pathway where the former one catalyses the first regulatory reaction and controls the metabolism of glucose-6-PO 4 by this pathway. Although several studies had been conducted in the past showing the effect of various abiotic stresses on carbohydrate metabolism in seedlings of different plants (Kaur et al 2003a;Jha and Dubey 2004;Devi et al 2007) but there is little information on the effect of Pb on carbon metabolism in pea seedlings. Therefore keeping in view the above mentioned points, effect of exogenous Pb on carbohydrate contents and vital enzymes of starch degradation, sucrose metabolism, pentose phosphate pathway and glycolysis has been studied.…”

mentioning

confidence: 99%

Effect of exogenous lead on growth and carbon metabolism of pea (Pisum sativum L) seedlings

Devi

Munjral

Gupta

et al. 2012

Physiol Mol Biol Plants

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The present study investigated the effect of exogenous lead (Pb) on seedling growth, carbohydrate composition and vital enzymes of sucrose metabolism, starch degradation, pentose phosphate pathway and glycolysis in pea seedlings. With 0.5 mM Pb, reduction of about 50 % in shoot and 80 % in root lengths was observed. At 5 and 7 days of seedling growth, cotyledons of Pb-stressed seedlings had about 25-50 % lower α-and β-amylase activities resulting in their higher starch content. Low starch content in the cotyledons of control seedlings at days 1, 3, 5 and 7 may be due to higher investment of carbon for seedling growth. Seedlings exposed to Pb showed significant inhibition of about 30-50 % in acid invertase activity in the growing tissues i.e. roots and shoots. Sucrose content increased by 10-20 % in shoots with much larger increase in cotyledons at 5-7 days of growth in Pb-stressed seedlings. In stressed seedlings, sucrose synthase (SS) and sucrose-6-phosphate synthase (SPS) enzymes were down regulated in the roots but SS activity was up regulated in the cotyledons leading to increased sucrose content. Exogenous Pb increased the activities of glucose-6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate dehydrogenase (6PGDH) in the cotyledons. Down regulation of G6PDH and up regulation of hexokinase (HXK) in the roots and shoots of stressed seedlings indicated that hexoses could be utilised preferably for glycolysis rather than pentose phosphate pathway in these tissues. Due to limited supply of sugars to growing tissues in the stressed seedlings, increased HXK may play a role in sugar sensing. Phosphoglucomutase (PGM) activity was maximum in the cotyledons and minimum in roots showing its importance in the conversion of glucose-1-phosphate into glucose-6-phosphate. Reduced seedling growth observed in the presence of exogenous Pb was mainly due to the decrease in the activities of amylases and invertases in the cotyledons and growing tissues respectively. Further biosynthetic capacity of the roots and shoots was down regulated in the pea seedlings due to reduced efficiency of pentose phosphate pathway under Pb toxicity.

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“…Therefore, the increased sucrose level in fine roots from the polluted site could result not from lowered sucrolysis (then sucrose level would be constant) but probably from a greater capacity for sucrose synthesis (Jha and Dubey 2004) or efficiency of carbon allocation to roots (Liu and Tyree 1997).…”

Section: Carbohydrate Metabolism In Fine Rootsmentioning

confidence: 99%

“…A large group of heavy metals can directly or indirectly alter root elongation and biomass (Arduini et al 1995;Di Baccio et al 2003), disturb water relations and mineral nutrition (Gouia et al 2000), cause oxidative damage of tissues (Landberg and Greger 2002;Pukacki and Kamiñska-Ro¿ek 2002;Schützendübel and Polle 2002), affect the activity of some enzymes (Arisi et al 2000;Gouia et al 2000;Lagriffoul et al 1998;Mattioni et al 1997;Van Assche and Clijsters 1990), and change carbohydrate levels (Brunner et al 2002;Greger and Bertell 1992;Jha and Dubey 2004).…”

Section: Introductionmentioning

confidence: 99%

Acclimation of poplar trees to heavy metals in polluted habitats: l. Carbohydrate metabolism in fine roots of Populus deltoides

Lorenc‐Plucińska

Stobrawa

2011

Acta Soc Bot Pol

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Concentrations of total nonstructural carbohydrates (TNC), soluble carbohydrates, starch, sucrose, glucose, fructose, raffinose, galactose, stachyose, mannitol and specific activities of soluble acid (AI) and neutral (NI) invertases, sucrose synthase (SuSy), hexokinase (HK), fructokinase (FK), glyceraldehyde 3-phosphate dehydrogenase (GAPDH) and glucose 6-phosphate dehydrogenase (G6PDH) were analyzed in fine roots of Populus deltoides Bartr. ex Marsh growing at a polluted site (near copper smelters) and a control site (free from heavy pollution). Also chemical properties of the soil from both sites were assessed. In comparison with the control, fine roots from the polluted site contained greater concentrations of TNC, soluble sugars, starch and sucrose but less hexoses, so they had higher values of sucrolysis index (sucrose/hexoses). The activity of AI, NI and SuSy declined insignificantly, while specific activities of HK, FK, GAPDH and G6PDH were significantly inhibited. The results suggest that a long-term heavy metal stress leads to an accumulation of carbohydrates and altering activities of glycolysis and the oxidative pentose phosphate pathway in fine roots.

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Carbohydrate metabolism in growing rice seedlings under arsenic toxicity

Cited by 122 publications

References 23 publications

Screening Indian Mustard Genotypes for Phytoremediating Arsenic‐Contaminated Soils

Screening Indian Mustard Genotypes for Phytoremediating Arsenic‐Contaminated Soils

Effect of exogenous lead on growth and carbon metabolism of pea (Pisum sativum L) seedlings

Acclimation of poplar trees to heavy metals in polluted habitats: l. Carbohydrate metabolism in fine roots of Populus deltoides

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