Testing differences in relative growth rate: A method avoiding curve fitting and pairing

Poorter, Hendrik; Lewis, Charles

doi:10.1111/j.1399-3054.1986.tb02447.x

Cited by 129 publications

(95 citation statements)

References 6 publications

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“…For each replicate chamber, mean dry weights were calculated for five observations within a harvest. An ANOVA was performed according to Poorter & Lewis (1986). A trend analysis over plant age was conducted with data partitioned using orthogonal contrasts; this approach allowed examination of the nature of changes in RGR, i.e., linear, quadratic and cubic.…”

Section: Discussionmentioning

confidence: 99%

Response of radish to multiple stresses

et al. 1990

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SUMMARYExperiments were conducted to determine the impact of nitrogen and ozone (O3) stress on the growth of domestic radish Raphanus sativus L. cv. Cherry Belle. Plants were grown in field chambers with sub-, optimal and supraoptimal levels of nitrogenous fertilizer. Chamber air was either charcoal-filtered, or supplemented with one of two levels of O3. The highest O3 treatment resulted in significant reduction in weight of hypocotyls and roots while elevated nitrogen treatments resulted in increased weight of all plant parts. Ozone did not affect the weight of plant foliage at any nitrogen level. Plants grown with lower levels of nitrogen had less leaf biomass but the tissue accounted for a greater percentage total weight than did the foliage of higher nitrogen treatments. Relative growth rate of whole plants was not aflFected by O3 or nitrogen treatments refiecting compensation in response to both stresses. Ozone-induced depression in biomass was observed in 03-treated plants grown with higher nitrogen supply but not in those grown with limiting nitrogen. This observation could reflect compensation at the lower levels of nitrogen supply or inability to detect changes in biomass due to reduced weights of plants grown at the lowest nitrogen supply. The dry weight ratio of sink organs (hypocotyl plus root)/shoot was significantly correlated with the total non-structural carbohydrate (TNC) content of these organs, regardless of treatment. Initially, O3 induced a significant decrease and nitrogen an increase in percent TNC of sink organs. At later sampling times, plants adjusted to stress as effects on percent TNC were no longer evident.

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Section: Discussionmentioning

confidence: 99%

Response of radish to multiple stresses

et al. 1990

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“…It should be noted, however, that a significant interaction between [CO # ] and time occurred, which is more complex than this analysis can elucidate. On the other hand, the significant quadratic component of the interaction between temperature regime and time indicates that there was a positive effect of temperature regime on RGR, which changed linearly with time (Poorter & Lewis, 1986). Fits of instantaneous RGR against time showed that a positive correlation of RGR with temperature regime occurred in the beginning of the experiment, which then vanished (data not shown).…”

Section: Effects Of Temperature Regime and [Co # ] On Growth During Tmentioning

confidence: 95%

“…The log etransformed dry weights were used as dependent variables (Poorter & Lewis, 1986). By this method the interactions of [CO # ] with time or temperature with time were partitioned into orthogonal contrasts with linear and quadratic components (Sokal & Rohlf, 1981).…”

Section: Discussionmentioning

confidence: 99%

Effects of tree size and temperature on relative growth rate and its components of Fagus sylvatica seedlings exposed to two partial pressures of atmospheric [CO₂]

Bruhn¹,

Leverenz²,

Saxe³

2000

New Phytologist

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Growth responses of two provenances of European beech (Fagus sylvatica) were studied. The seedlings were grown in closed‐top chambers at four temperature regimes (−2.9 °C below ambient, ambient, +2.3 °C and +4.8 °C above ambient) in combination with two CO2 partial pressures (40 Pa and 74 Pa). Growth was followed by making destructive harvests c. every 25 d from germination in early June to senescence in late September. Allocation patterns were significantly affected by the temperature regimes. However, changes in dry matter allocation and morphology associated with the different treatments at a given time were mostly a result of differences in tree size. Temperature regimes only had a significant effect on the relative growth rate, RGR, at the beginning of the experiment. In contrast to temperature, high [CO2] increased RGR throughout the experiment when compared with plants of equal size. As the trees increased in size net assimilation rate, NAR, decreased but the effect of [CO2] on both NAR and RGR had a tendency to increase. Increases in NAR caused by elevated [CO2] were partly counteracted by reductions in the leaf area ratio, LAR. Reductions in LAR were caused by concomitant reductions in specific leaf area, SLA, whereas the level of [CO2] did not significantly affect leaf weight ratio, LWR, nor other dry weight ratios. The interactions between temperature and [CO2] are highly dependent on whether they are expressed as instantaneous values for plants at a common age or instantaneous values at a common size (and thereby extracting the effects of ontogenetic drift). When comparing instantaneous values at common sizes, the positive effect of [CO2] on RGR increased with plant size in every temperature regime. This also occurred in every temperature regime when comparing plants of equal age but the response to [CO2] was less. The effect of [CO2] on RGR was dependent on growth temperature. The positive effects of elevated [CO2] on RGR were less than the positive effect on photosynthesis. The two provenances did not differ significantly in the response of RGR to [CO2] which is in agreement with measurements of photosynthesis.

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“…Occurrence of significant differences in  between healthy and infected plants was evaluated per species and nutrient treatment by testing with s the effect of the plant statusitime interaction on the log e -transformed plant weight (Poorter & Lewis, 1986).…”

Section: Discussionmentioning

confidence: 99%

Influence of cucumber mosaic virus infection on the growth response of Portulaca oleracea (purslane) and Stellaria media (chickweed) to nitrogen availability

1998

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The study characterized the influence of cucumber mosaic virus (CMV) on the growth response of two annual weeds to nitrogen. Plants were grown individually along a N gradient from 4 to 32 mmol l −" and data were interpreted using growth analysis. Plant biomass increased with N concentration and was significantly higher for healthy than infected plants at the two highest N concentrations. Healthy plants of Portulaca oleracea L. were characterized by lower biomass allocation to leaves and higher biomass allocation to roots than infected plants ; no change in biomass allocation was recorded for Stellaria media Vill. Relative growth rate (), net assimilation rate () and specific leaf area () of plants increased with increasing N concentration. Healthy plants of P. oleracea were characterized by a higher  and  and a lower  than infected plants, whereas healthy S. media had a higher  but a similar  and  or leaf weight ratio () compared with infected plants. The consequences of these results on the population dynamics of weeds and virus spread are discussed.

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Testing differences in relative growth rate: A method avoiding curve fitting and pairing

Cited by 129 publications

References 6 publications

Response of radish to multiple stresses

Response of radish to multiple stresses

Effects of tree size and temperature on relative growth rate and its components of Fagus sylvatica seedlings exposed to two partial pressures of atmospheric [CO₂]

Influence of cucumber mosaic virus infection on the growth response of Portulaca oleracea (purslane) and Stellaria media (chickweed) to nitrogen availability

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Testing differences in relative growth rate: A method avoiding curve fitting and pairing

Cited by 129 publications

References 6 publications

Response of radish to multiple stresses

Response of radish to multiple stresses

Effects of tree size and temperature on relative growth rate and its components of Fagus sylvatica seedlings exposed to two partial pressures of atmospheric [CO2]

Influence of cucumber mosaic virus infection on the growth response of Portulaca oleracea (purslane) and Stellaria media (chickweed) to nitrogen availability

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Effects of tree size and temperature on relative growth rate and its components of Fagus sylvatica seedlings exposed to two partial pressures of atmospheric [CO₂]