Sorghum isoprenoid pathway responses to manganese concentration

Wilkinson, Robert

doi:10.4141/cjps91-140

Cited by 5 publications

(2 citation statements)

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“…Presence of excess Mn2+ was shown to influence many reactions in plant metabolism. Enzyme activities of biosynthetic systems are decreased by excess Mn2+ in mevalonic kinase (34), ent-kaurene synthetase (19,48), phytoene synthetase (24), trans-geranylgeranyl pyrophosphate synthase (27), and conversions from isopentenyl pyrophosphate to geranylgeranyl pyrophosphate (42). Electron transfer is influenced by Mn2+ (26,28,29,36,50).…”

Section: Merolachlor Irzjluencementioning

confidence: 99%

“…biosynthesis in wheat (Triticum aestivum L.) coleoptiles by inhibiting metabolism of [14C]mevalonate phytoene, and number of other products, including putative ent-kaurene (48). Major shifts in isoprenoid biosynthesis between sorghum cultivars were documented (42). Since gibberellins (GAS) are diterpenoid carboxylic acids originating from ent-kaurene and other isoprenoid precursors, the growth inhibitory effect of excess Mn2+ present in acid-soil solutions (49) to the growth of some sorghum cultivars may be related to reduced biosynthesis of any of several GA precursors.…”

Section: Introductionmentioning

confidence: 99%

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Growth and physiological responses of sorghum cultivars exposed to excess H⁺ and the herbicide metolachlor

Wilkinson¹,

Duncan²,

Meredith³

et al. 1993

Can. J. Bot.

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The growth responses of six grain sorghum (Sorghum bicolor (L.) Moench) cultivars exposed to single and (or) combined treatments of the herbicide metolachlor (2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methlethyl)acetamide) and excess H+ were investigated under growth chamber conditions. The sorghum cultivars tested were '38M', '58M', 'GP-10', 'SC574', 'SC283' (inbred lines), and 'Funk G522DR' (F1 hybrid). Shoot lengths were measured on seedlings from each cultivar grown for 14 days in white quartz flintshot sand treated with metolachlor at 0, 0.25, 0.5, 1.0, and 2.0 mg/kg. Pots were watered with 100 mL of 0.1 M acetate at pH 6.0, 5.5, 5.0, 4.5, or 4.0 on alternate days. A sorghum mutant ('58M') shown to have enriched gibberellin levels and '38M', a second sorghum mutant, were essentially immune to either metolachlor (2 mg/kg) or excess H+ concentration (pH 4.0). 'Funk G522DR' was sensitive to both excess H+ concentrations and metolachlor, and interactions between these two stresses were evident. The remaining cultivars were intermediate in response to both excess H+ concentration and metolachlor. Glutathione contents and glutathione S-transferase activities of the metolachlor-resistant 'GP-10' and the metolachlor-sensitive 'Funk G522DR' were comparable. Thus, enriched gibberellin levels may be a major factor in the differential response of the tested sorghum cultivars to metolachlor and (or) excess H+ stresses. Phenological response in relation to multiple stresses is discussed. Key words: pH, metolachlor, gibberellin, acid soil.

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