Modelling water uptake, growth and sucrose accumulation of sugarcane subjected to water stress

Singels, A.; Berg, M. van den; Smit, M. A.; Jones, Matthew R.; Antwerpen, R. van

doi:10.1016/j.fcr.2010.02.003

Cited by 40 publications

(37 citation statements)

References 15 publications

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“…De modo contrário, a simulação para a variedade RB 83-5486 apresentou acúmulo contínuo de sacarose até a data da colheita. Singels et al (2010) observaram estabilização no acúmulo de sacarose aproximadamente aos 190 DAP.…”

Section: Resultsunclassified

“…2012 O modelo DSSAT/Canegro, baseado no modelo Ceres-Maize (Jones & Kiniry, 1986), foi desenvolvido na África do Sul para modelar os processos fisiológicos mais relevantes da indústria açucareira sul-africana (Inman-Bamber, 1991). Incluído no conjunto de modelos "decision support system for agrotechnology transfer" (DSSAT versão 3.1) (Inman-Bamber & Kiker, 1997) e atualizado na versão 4.5 do DSSAT (Singels et al, 2008), o DSSAT/Canegro vem sendo aplicado em diversas regiões do mundo para análise e avanço no conhecimento dos sistemas de produção de cana-de-açúcar (Inman-Bamber, 1994;Singels & Bezuidenhout, 2002;Knox et al, 2010;Singels et al, 2010;Marin et al, 2011).…”

Section: Introductionunclassified

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Parametrização e avaliação do modelo DSSAT/Canegro para variedades brasileiras de cana-de-açúcar

Nassif

Marin

Filho

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi parametrizar e avaliar o modelo DSSAT/Canegro para cinco variedades brasileiras de cana-de-açúcar. A parametrização foi realizada a partir do uso de dados biométricos e de crescimento das variedades CTC 4, CTC 7, CTC 20, RB 86-7515 e RB 83-5486, obtidos em cinco localidades brasileiras. Foi realizada análise de sensibilidade local para os principais parâmetros. A parametrização do modelo foi feita por meio da técnica de estimativa da incerteza de probabilidade generalizada ("generalized likelihood uncertainty estimation", Glue). Para a avaliação das predições, foram utilizados, como indicadores estatísticos, o coeficiente de determinação (R 2 ), o índice D de Willmott e a raiz quadrada do erro-médio (RMSE). As variedades CTC apresentaram índice D entre 0,870 e 0,944, para índice de área foliar, altura de colmo, perfilhamento e teor de sacarose. A variedade RB 83-5486 apresentou resultados similares para teor de sacarose e massa de matéria fresca do colmo, enquanto a variedade RB 86-7515 apresentou valores entre 0,665 e 0,873, para as variáveis avaliadas.Termos para indexação: Saccharum, biometria, calibração, modelagem, validação. Parameterization and evaluation of the DSSAT/Canegro model for Brazilian sugarcane varietiesAbstract -The objective of this work was to parameterize and to evaluate the DSSAT/Canegro model for five Brazilian sugarcane varieties. The parameterization was done using biometric and growth data from the varieties CTC 4, CTC 7, CTC 20, RB 86-7515, and RB 83-5486, obtained in five Brazilian locations. Local sensitivity analysis was performed for the main parameters. Model parameterization was done using the generalized likelihood uncertainty estimation (Glue) method. The predictions were evaluated using the coefficient of determination (R²), Willmott's D-index, and the root mean square error (RMSE) as statistical indexes. CTC varieties showed D values ranging from 0.870 to 0.944 for leaf area index, stalk height, tillering, and sucrose content. The RB 83-5486 variety showed similar results for sucrose content and fresh matter mass of stalks, whereas the RB 86-7515 variety showed values ranging from 0.665 to 0.873 for all variables analyzed.

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Section: Resultsunclassified

Section: Introductionunclassified

Parametrização e avaliação do modelo DSSAT/Canegro para variedades brasileiras de cana-de-açúcar

Nassif

Marin

Filho

et al. 2012

Pesq. agropec. bras.

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“…Entre esses modelos, o DSSAT/Canegro (Inman-Bamber, 1991;Singels et al, 2008) O modelo DSSAT/Canegro, baseado no modelo Ceres-Maize (Jones & Kiniry, 1986), foi desenvolvido na África do Sul para modelar os processos fisiológicos mais relevantes da indústria açucareira sul-africana (Inman-Bamber, 1991). Incluído no conjunto de modelos "decision support system for agrotechnology transfer" (DSSAT versão 3.1) (Inman-Bamber & Kiker, 1997) e atualizado na versão 4.5 do DSSAT (Singels et al, 2008), o DSSAT/Canegro vem sendo aplicado em diversas regiões do mundo para análise e avanço no conhecimento dos sistemas de produção de cana-de-açúcar (Inman-Bamber, 1994;Singels & Bezuidenhout, 2002;Knox et al, 2010;Singels et al, 2010;Marin et al, 2011).…”

Section: Introductionunclassified

Parametrização e avaliação do modelo DSSAT/CANEGRO para variedades brasileiras de cana-de-açucar

Nassif¹

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“…It reduces cell division and cell expansion, resulting in substantial growth reduction (Hsiao, 1973, Chaves et al, 2003, Shao et al, 2008). Inhibition of stem and leaf development negatively affects plant height and leaf area (Table 1-1) and consequently reduces photosynthesis, transpiration (Shao et al, 2008) and crop productivity (Singels et al, 2010).…”

Section: Water Stress and Plant Growth And Developmentmentioning

confidence: 99%

“…In response to water stress, sugarcane displays pronounced morphological and growth responses that include a reduction in stalk and leaf elongation, and accelerated leaf senescence. Together, these responses result in a decrease in biomass production and sucrose yield due to reduced rates of photosynthesis and crop growth as well as altered partitioning of assimilates between roots, leaves, structural stem material and stored sucrose (Singels et al, 2000, Singels and Inman-Bamber, 2002, Inman-Bamber, 2004, Singels et al, 2010.…”

Section: Chapter 1: General Introductionmentioning

confidence: 99%

Conditional up-regulation of cytokinin status increases growth and survival of sugarcane in water-limited conditions

Punpee

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Water deficit (water stress) is a major cause of yield loss across all crops. It is the single largest crop productivity constraint in sugarcane in most of sugarcane producing countries and is attracting considerable research interest. Several biological factors have been implicated to water stress responses in plants. Hormones, particularly abscisic acid (ABA), ethylene, cytokinins (CK) and gibberellins are emerging as key regulators of water stress responses. Here, I explored the effect of artificial elevation of CK levels on the response of young sugarcane plants to water stress. Focus of the research was on the onset of senescence and change in photosynthesis that typify water stress responses of plants. Understanding the mechanistic basis of responses of sugarcane to water stress may allow developing strategies for crop improvement and breeding. I studied the effects of modifying cytokinin (CK) levels in water-stressed sugarcane (Saccharum officinarum L.) via two strategies; exogenous supply of synthetic cytokinin N6-benzyladenine (BA) and conditional or constitutional up-regulation of CK biosynthesis in 113 independent transgenic sugarcane lines that were generated as part of this thesis research. Young plants were exposed to water stress in the glasshouse by maintaining soil moisture at 50% field capacity via daily irrigation. Exogenous application of CK occurred via foliar spray or a root drench, while conditional up-regulation of endogenous CK levels under water stress conditions was achieved by expressing the gene encoding CK biosynthesis regulatory enzyme, 2-isopentenyltransferase (IPT), via senescence-associated (SAG12) or abscisic acid-responsive (RAB17) promoters. Maize Ubi promoter was used for constitutive expression of IPT transgene. A popular Australian sugarcane variety Q208A was used for this study. All promotors elevated endogenous CK levels under water stress conditions in the majority of the transgenic lines created. Responses to water stress was studied by quantifying biomass, root/shoot allocation, leaf area, photosynthesis parameters, hormone profiles and gene expression to discern the effects of impaired water relations on carbon fixation and the basis of CKinduced growth improvement. Increased CK levels, via exogenous supply of BA or stress-induced expression of IPT, strongly improved sugarcane growth and survival under water stress. On average, plants with elevated CK-levels retained 30-40% more chlorophyll and 40-50% more green leaf area than wild-type plants at the end of 50 days of growth under water deficit conditions.Compared with control plants, CK-supplied and IPT-transgenic plants maintained higher photosynthetic rates and stomatal conductance, and achieved greater biomass under water stress.External supply of CK significantly increased growth under water stressed and non-stressed ii conditions in wild type plants compared to those that did not receive CK. Transgenic line RAB25showed the greatest improvement in biomass production. Some transgenic lines, including RAB2...

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Modelling water uptake, growth and sucrose accumulation of sugarcane subjected to water stress

Cited by 40 publications

References 15 publications

Parametrização e avaliação do modelo DSSAT/Canegro para variedades brasileiras de cana-de-açúcar

Parametrização e avaliação do modelo DSSAT/Canegro para variedades brasileiras de cana-de-açúcar

Parametrização e avaliação do modelo DSSAT/CANEGRO para variedades brasileiras de cana-de-açucar

Conditional up-regulation of cytokinin status increases growth and survival of sugarcane in water-limited conditions

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