The relationship between phosphate absorption and root length in nine wheat cultivars

Römer, Wilhelm; Augustin, Jorg; Schilling, G.; Loughman, B. C.; Gašparíková, O.; Kolek, J.

doi:10.1007/bf02139938

Cited by 44 publications

(18 citation statements)

References 2 publications

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“…3) and longer root hairs. As a general adaptive mechanism to low P supply a higher ratio of root to shoot growth-rate (F6hse et al, 1988; Table 2), an absolute increase in root length at moderate P deficiency (R6mer et al, 1988;Fig. 2) and an increased root-hair length (F6hse et al, 1983.…”

Section: Discussionmentioning

confidence: 99%

Genotypic differences in phosphorus efficiency of wheat

1993

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In an attempt to evaluate whether breeding and selection for high yielding capacity did change the P requirements of modern wheat cultivars, the response of two wheat cultivars to different levels of P supply was investigated. A traditional cultivar ("Peragis") and a modern cultivar ("Cosir") were cultivated in a C-loess low in available P and high in CaCO3 in 120 cm high PVC pots. Shoot and root growth at different developmental stages was compared. The grain yield of the modern cultivar Cosir was higher at limiting and non-limiting P supply and, therefore, this cultivar can be considered as more P-efficient than the traditional cultivar. From the results it can be concluded that the main factors contributing to the higher P efficiency of the modern cultivar are (i) efficient use of assimilates for root growth characteristics which enhance P acquisition: smaller root diameter, and longer root hairs, (ii) efficient remobilization of P from vegetative plant organs to the grains, and (iii) lower P requirement for grain yield formation because of lower ear number per plant but higher grain number per ear.

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Section: Discussionmentioning

confidence: 99%

Genotypic differences in phosphorus efficiency of wheat

1993

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“…Römer et al (1989), entretanto, mencionaram que, para plantas de trigo com 21 dias, na presença de disponibilidade adequada de fósforo, o sistema radicular não foi importante para discriminar a eficiência de absorção e, quando em baixa disponibilidade, pode ter havido adaptação por meio do aumento das raízes ou mesmo da efetividade da absorção de fósforo por unidade de raiz. A seleção de plantas eficientes, portanto, poderia ser efetuada, procurando esta adaptação aliada às maiores produtividades.…”

Section: Resultsunclassified

Peletização de sementes de sorgo com calcário e com termofosfato e sua influência na absorção de fósforo e de potássio

Vasconcellos

Duraes

Ribeiro³

et al. 2000

Rev. Bras. Ciênc. Solo

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RESUMOO trabalho foi realizado com o objetivo de avaliar a influência da peletização de sementes de três cultivares de sorgo (Sorghum bicolor (L.) Moench), cv. BRS 701, BRS 304 e BRS 601, com calcário e com termofosfato magnesiano, na absorção de P e de K. Sementes peletizadas e não peletizadas foram colocadas para germinar, por oito dias, em temperatura ambiente. Após este período, oito plântulas com crescimento uniforme (parte aérea e raiz) foram distribuídas em vasos que continham solução nutritiva completa de Hoagland. Após 20 dias, iniciou-se a determinação da absorção de fósforo e de potássio por meio da depleção desses nutrientes na solução nutritiva. Os resultados permitiram concluir que o tipo de revestimento das sementes influenciou, de modo distinto, o crescimento de cada cultivar de sorgo. A absorção de P e de K e o total absorvido também foram influenciados pelo revestimento das sementes em virtude do aumento no crescimento inicial das plântulas. De modo geral, independentemente do tipo de revestimento das sementes, houve maior absorção de fósforo e de potássio quando as sementes foram peletizadas. A taxa de absorção de fósforo aumentou com o peso da matéria seca do sistema radicular e com o peso da matéria seca da parte aérea, mas, neste caso, até o limite de 3,5 µmol planta -1 h -1 de P. Taxas de absorção acima deste valor não estiveram associadas ao aumento do peso da matéria seca da parte aérea.Termos para indexação: Sorghum bicolor, absorção iônica, solução nutritiva.

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“…Measures of Pi uptake rates have been commonly standardized by dividing by cm or m of length, or mg or g of biomass (Drew et al, 1984;Lefebvre and Glass, 1982;Nielsen and Barber, 1978;R6mer et al, 1989). In most published reports, raw data are not provided, and hence, it is difficult to determine whether or not uptake rate is linearly related to root length or biomass.…”

Section: Discussionmentioning

confidence: 99%

“…The traditional approach for calculating this measure involves dividing influx by root length or biomass (Chapin and Bieleski, 1982;Drew et al, 1984;Lefebvre and Glass, 1982). This has been used as a method of standardizing influx for differences in root size to make comparisons between species or between genotypes within species (F6hse et al, 1988;Furlani et al, 1984;R6mer et al, 1989;Schjorring and Nielsen, 1987). A number of these studies have suggested that genotypes with small roots have higher uptake rates per unit of root size (Frhse et al, 1988;Furlani et al, 1984;Schjorring and Nielsen, 1987).…”

Section: Introductionmentioning

confidence: 99%

Correction for non-linear relationships between root size and short term Pi uptake in genotype comparisons

1991

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Variation in phosphate (Pi) absorption rates, root length and root mass was investigated in 25 genotypes or inbred lines of Arabidopsis thaliana (L.) Heynh. All variables differed among lines (P < 0.0001), and larger plants with larger roots and shoots had faster Pi uptake rates (influx) (P < 0.0001). Within genotypes, influx was non-linearly related to root size. Increases in influx were not directly proportional to increases in root size; with a doubling in root length or biomass, there was only a 1.30 or 1.27 concomitant increase in influx, respectively. Because inbred lines are genetically homogeneous, this within-genotype pattern was random, and not genetically based.Influx has traditionally been standardized for variation in plant size by dividing by root length or biomass. This assumes a linear relationship between influx and root size. As uptake rate was non-linearly dependent on root size in A. thaliana, this resulted in a spurious negative correlation between influx per cm or mg root and root length or biomass. We present a general method that standardizes influx for variation in root size within genetically homogenous genotypes. This method determines and corrects for random non-linear relationships between influx and root size. In A. thaliana, influx per unit root length or biomass differed among lines (P < 0.0001), but these differences did not correlate with root length or biomass. These data contradict the common interpretation in previous literature that species or cultivars with small roots have evolved greater influx per unit size of root.

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The relationship between phosphate absorption and root length in nine wheat cultivars

Cited by 44 publications

References 2 publications

Genotypic differences in phosphorus efficiency of wheat

Genotypic differences in phosphorus efficiency of wheat

Peletização de sementes de sorgo com calcário e com termofosfato e sua influência na absorção de fósforo e de potássio

Correction for non-linear relationships between root size and short term Pi uptake in genotype comparisons

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