Effects of a pregrowth period in Al-free nutrient solution on macronutrient composition of two upland rice cultivars with various Al sensitivity

Jan, Farid

doi:10.1034/j.1399-3054.1993.880117.x

Cited by 2 publications

(4 citation statements)

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“…These results are similar to those from studies with cowpea (Horst et al, 1983), wheat (Delhaize et al, 1993;Rincon and Gonzales, 1992;Tice et al, 1992), and upland rice (Jan, 1993), which also indicated that sensitive genotypes accumulate greater amounts of AI in the root tip region. This evidence lends support to the view that tolerance to A1 often is determined by A1 exclusion from cells critical to growth processes (Horst et al, 1983).…”

Section: Discussionsupporting

confidence: 80%

“…The mechanism of tolerance focused on here is the exclusion of AI from root cells. Experiments with cowpea (Horst et al, 1982) wheat (Delhaize et al, 1993;Rincon and Gonzales,1992;Tice et al, 1992) and upland rice (Oryza sativa, Jan, 1993) have shown that roots of tolerant genotypes may accumulate less A1, particularly at the root apex, which is a primary site of action for A1 toxicity (Bennett et al, 1985;Clarkson, 1965;Horst et al, 1983;. In this study, we measure A1 accumulation in the 5 nun root apex and in other developmentally defined regions of the soybean root.…”

Section: Introductionmentioning

confidence: 99%

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Aluminum accumulation and associated effects on 15NO3 − influx in roots of two soybean genotypes differing in Al tolerance

et al. 1994

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A study was conducted to examine aluminum (A1) exclusion by roots of two differentially tolerant soybean (Glycine max L, Merr.) lines, P1-416937 (Al-tolerant) and Essex (Al-sensitive). Following exposure to 80/~M A1 for up to 2 h, roots were rinsed with a 10 mM potassium citrate solution and rapidly dissected to allow estimation of intracellular A1 accumulation in morphologically distinct root regions. Using 10 min exposures to 300 ~M 15NO~-and dissection, accompanying effects on NO 3 uptake were measured. With AI exposures of 20 min or 2 h, there was greater A1 accumulation in all root regions of Essex than in those of P1-416937. The genotypic difference in AI accumulation was particularly apparent at the root apex, both in the tip and in the adjacent root cap and mucilage. Exposure of roots to A1 inhibited the uptake of 15NO~-to a similar extent in all root regions. The results are consistent with AI exclusion from cells in the root apical region being an important mechanism of A1 tolerance.

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Aluminum accumulation and associated effects on 15NO3 − influx in roots of two soybean genotypes differing in Al tolerance

et al. 1994

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“…Rengel (1990) reported that plant age effects could be related to differences in the effect of Al on Mg uptake. The increased Al tolerance in older plants in rice was attributed to increased storage of organic acids or P in the older tissue (Jan, 1993). The higher initial mass of tillers and stolon tip cuttings than seeds could allow sufficient storage of an unknown compound that is important in overcoming the initial effects of Al toxicity.…”

Section: Resultsmentioning

confidence: 99%

“…Aluminium tolerance is reported to increase with plant age in annual ryegrass (Rengel, 1990), wheat (Wheeler, 1994), and rice (Jan, 1993;Thawornwong and Van Diest, 1974). In a preliminary experiment, Wheeler et al (1992) This paper reports two experiments that investigated the relative Al tolerance of ryegrass and white clover plants grown from seed or propagated vegetatively.…”

Section: Introductionmentioning

confidence: 97%

Differences in aluminium tolerance of ryegrass and white clover plants grown from seed or propagated vegetatively

Wheeler¹

1995

Journal of Plant Nutrition

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The effect of aluminium (Al) on the relative yield of plants grown from seeds of ryegrass (Lolium perenne L.) or white clover (Trifolium repens L.) and either tillers (ryegrass) or stolon tip cuttings (white clover) were investigated using a low ionic strength (2.7 x 10 -3 M) solution culture technique. In ryegrass, plants grown from tillers had higher relative yields than plants grown from seedlings in the tops when solution Al concentrations were greater than 16 μM and in the roots when solution Al concentrations were greater than 7 μM. In white clover, relative yields in the tops and roots plants were higher in plants grown from stolon tip cuttings than from seedlings when solution Al concentrations were greater than 10 μM. There were no significant cultivar effects. The results indicate that plants used in Al-tolerance experiments can be grown from seed or vegetatively propagated, provided solution Al rates are adjusted to reflect differences in Al tolerance.

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Effects of a pregrowth period in Al-free nutrient solution on macronutrient composition of two upland rice cultivars with various Al sensitivity

Cited by 2 publications

References 0 publications

Aluminum accumulation and associated effects on 15NO3 − influx in roots of two soybean genotypes differing in Al tolerance

Aluminum accumulation and associated effects on 15NO3 − influx in roots of two soybean genotypes differing in Al tolerance

Differences in aluminium tolerance of ryegrass and white clover plants grown from seed or propagated vegetatively

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