Modelling Asymmetrical Growth Curves that Rise and then Fall: Applications to Foliage Dynamics of Sugar Beet (Beta vulgarisL.)

Werker, A. R.

doi:10.1006/anbo.1997.0387

Cited by 73 publications

(42 citation statements)

References 14 publications

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“…This standard bolt height was taken to be 5 cm, the previously defined minimum height (Smit 1983), and a functional approach was adopted to determine the time required for the elongating bolt to reach this height. To account for daily temperature fluctuation in the glasshouse, the accumulated thermal time above a threshold of 3°C was related to the sequentially measured bolt height (Werker and Jaggard 1997). With respect to the various growth functions, the expolinear growth equation H = (c/r)ln(1 + exp[r(h -h b )] (Goudriaan and Monteith 1990) was most appropriate for describing the relationship between bolt height and thermal time; where H is the bolt height, h is the accumulated thermal time after vernalization, r is the initial relative growth rate, c is the maximum absolute growth rate and h b is the accumulated thermal time at which the bolt passes from exponential to linear growth.…”

Section: Determining Time Taken To Boltmentioning

confidence: 99%

Modification of gibberellin signalling (metabolism & signal transduction) in sugar beet: analysis of potential targets for crop improvement

Mutasa-Gottgens

Mathews

et al. 2008

Transgenic Res

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Sugar beet, Beta vulgaris spp. vulgaris is a biennial long day plant with an obligate requirement for vernalization (prolonged exposure to low temperature). As a spring crop in temperate European climates, it is vulnerable to vernalization-induced premature bolting and flowering, resulting in reduced crop yield and quality. Gibberellins (GAs) play important roles in key physiological processes including stem elongation (bolting) and flowering and are, therefore, potential targets for controlling reproductive growth in sugar beet. We show that the BvGA20ox gene, which encodes an enzyme necessary for GA biosynthesis, was transcriptionally activated in apices of sugar beet plants after vernalization and that GA metabolism can be manipulated to delay bolting in vernalized plants. We demonstrate that down-regulation of GA responses by transformation with the Arabidopsis thaliana gai gene (which represses GA signalling), under its own promoter (pgai::gai) or deactivation of GA by over-expression of the Phaseolus coccineus (bean) GA2ox1 gene, which inactivates GA, increased the required post vernalization thermal time (an accurate and stable measure of physiological time), to bolt by approximately 300 degrees Cd. This resulted in agronomically significant bolting time delays of approximately 2 weeks and 3 weeks in the pgai::gai and 35S::PcGA2ox1 plants, respectively. Our data represent the first transgenic sugar beet model to (1) show that GA signalling can be used to improve crops by manipulation of the transition to reproductive growth; and (2) provide evidence that GA is required for seed set in sugar beet.

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Section: Determining Time Taken To Boltmentioning

confidence: 99%

Modification of gibberellin signalling (metabolism & signal transduction) in sugar beet: analysis of potential targets for crop improvement

Mutasa-Gottgens

Mathews

et al. 2008

Transgenic Res

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“…, 2005). The model used here describes canopy dynamics (Werker & Jaggard, 1997), growth (Werker & Jaggard, 1998) and partitioning (Werker et al. , 1998) and estimates sugar and dry matter yields to within 1 t ha −1 for irrigated and rain‐fed sugar beet experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Biomass production (total dry matter) and sugar yield. The Broom's Barn sugar beet growth model simulates biomass (TDM) growth as the accumulated product of RUE and canopy‐intercepted radiation (Werker & Jaggard, 1997, 1998) and its partitioning to sugar (Werker et al. , 1998).…”

mentioning

confidence: 99%

“…Potential evapotranspiration, ET pot was split into potential soil evaporation, E s‐pot , and potential transpiration, TR c‐pot in direct proportion to the fraction of the land area covered by foliage. The foliage cover fraction was an output from the model (Werker & Jaggard, 1997). Both processes were then adjusted in response to the actual soil water content (SWC).…”

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confidence: 99%

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Modelling the variability of UK sugar beet yields under climate change and husbandry adaptations

Richter

Qi²,

Semenov

et al. 2006

Soil Use and Management

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In the future, UK summers are likely to be warmer and drier. Modelling differential water redistribution and uptake, we assessed the impact of future drier climates on sugar beet yields. Weather was generated for 1961-1990 (BASE) and predictions based on low- and high-emission scenarios (LO, HI) described in the most recent global climate simulations by the Hadley Centre, UK. Distributions and variability of relative soil moisture deficit (rSMD) and yield gap (drought-related yield loss, YG(dr) = 1-actual yield/potential yield), and sugar yield were calculated for different time-lines using regional weather, soil texture and management inputs. The rSMD is estimated to exceed the senescence threshold with a probability of 75% (2050sLO) to 95% (2080sHI) compared with 65% (BASE). The potential yield loss, YG(dr), is likely to increase from 17% (BASE) to 22% (2050sLO) to 35% (2080sHI). However, increasing potential growth rates (CO2 x temperature) cause average sugar yields to rise by between 1.4 and 2 t ha(-1) (2050sLO and 2050sHI respectively). Yield variation (CV%) may increase from 15-18% (BASE) to 18-23% (2050s) and 19-25% (2080s). Differences are small between regions but large within regions because of soil variability. In future, sugar yields on sands (8 t ha(-1)) are likely to increase by little (0.5-1.5 t ha(-1)), but on loams yields are likely to increase from 11 to 13 t ha(-1) (2050sHI) and 15 t ha(-1) (2080sHI). Earlier sowing and later harvest are potential tools to compensate for drought-related losses on sandy soils

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“…But the ability to uptake more nitrogen from the soil by its own, can't lead to the higher yields. Excessive nitrogen in plants causes extra vegetative and leaf growth (Giller, 2004) but may result in the lack of sugar accumulation in roots (Werker & Jaggard, 1997). to study that how much of the absorbance help the production, UTE and NUE were calculated, and the results are as follows.…”

Section: S Ugar Yield or White Sugar Yield Soil Mineral Nitrogen + mentioning

confidence: 99%

Evaluating Nitrogen Efficiencies and Accumulation in Sugar beet (Betavulgaris L.) Under Tape-Drip Irrigation

Ghasemi¹,

Esmaeili²,

Mohammadian³

2016

AMBIENT SCIENCE

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Improving agricultural input eff iciencies can lead to both decreasing production costs and saving the environment and landscape. Therefore using new irrigating systems that enable fertigation can be a proper alternative for conservative furrow irrigation. With the aim of optimizing land, water and nitrogen use, during previous years in a research farm of Karaj-Iran a trial was carried out under tape-drip irrigation and in strip factorial plot with a randomized complete block arrangement with 2 levels of On-Rows Spacing (14 and 20 cm), 2 levels of Planting Pattern ( 40-60 and 40-50) and 4 levels of Nitrogen (zero (N0), 50 (N1), 75 (N2) and 100 (N3) percent of the fertilizer recommendation for furrow irrigation). Nitrogen accumulation in separate parts of Sugar beet and in the whole plant determined, then Nitrogen Uptake Eff iciency (UPE), Nitrogen Utilization Eff iciency of Sugar and White sugar production (UTEs, UTEws) and Nitrogen Use Eff iciency to produce Sugar and White sugar (NUEs and NUEws) were calculated. A compound analysis wasn't allowed by Fmax test thus results of each year was analyzed separately. On-rows Spacing levels didn't show any signif icant differences among studied Traits and Planting Pattern except on a single ground organ and whole plant nitrogen accumulation, UPE and UTE. Nitrogen fertilizer has a signif icant influence on all traits in both years. Based on the results it has been observed that more the nitrogen fertilizer used more the rate of nitrogen accumulation in sugar beets occurred. However, by increasing use of nitrogen fertilizer UPE improved, but UTE and NUE decreased. AbstractIntroduction:

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Modelling Asymmetrical Growth Curves that Rise and then Fall: Applications to Foliage Dynamics of Sugar Beet (Beta vulgarisL.)

Cited by 73 publications

References 14 publications

Modification of gibberellin signalling (metabolism & signal transduction) in sugar beet: analysis of potential targets for crop improvement

Modification of gibberellin signalling (metabolism & signal transduction) in sugar beet: analysis of potential targets for crop improvement

Modelling the variability of UK sugar beet yields under climate change and husbandry adaptations

Evaluating Nitrogen Efficiencies and Accumulation in Sugar beet (Betavulgaris L.) Under Tape-Drip Irrigation

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