Modelling the effects of soil water limitations on transpiration and stomatal regulation of cauliflower

Kochler, M.; Kage, Henning; Stützel, Hartmut

doi:10.1016/j.eja.2006.12.003

Cited by 18 publications

(20 citation statements)

References 47 publications

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“…In this context, Kochler et al. () and Dodd et al. () found that root‐weighted soil water potential was an even better predictor of decreasing transpiration than raw soil water potential.…”

Section: Discussionmentioning

confidence: 99%

A Simple Drought‐Sensitive Model for Leaf : Stem Partitioning of Wheat

Ratjen

Neukam

Kage

2016

J Agronomy Crop Science

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We investigated the leaf : stem partitioning of winter wheat (Triticum aestivum L. varieties 'Dekan' and 'Batis') with and without drought influence. Irrigated and drought-stressed winter wheat, grown in a rainout shelter in 2009/10 and 2013/14, were sampled during shoot elongation phase at the experimental Farm Hohenschulen located in Northern Germany. The data set contains leaf (DM L ) and stem dry masses (DM S ), as well as measured water contents for several soil layers. A reduced relative dry matter allocation to leaves was observed under drought stress. Our results clearly show that, if simulated leaf : stem partitioning is not sensitive to drought, this will cause a positive bias in simulated leaf and a negative bias in simulated stem dry matter under water-limited conditions. This is in accordance with previous studies which revealed that crop simulators often overestimate the impact of drought on light-use efficiency, whereas the consequences on leaf area development are underestimated. However, the drought stress-induced shift in leaf : stem partitioning is yet not considered by most common wheat crop simulators. Our aim was to fill the gap in simulation of drought stress implications on leaf area development. A simple allometric model for leaf : stem partitioning (InðDM S Þ ¼ g Á InðDM L Þ þ h) was parameterized. Starting from the allometric leaf : stem relationship observed under optimum water supply, a correction term was introduced, which allows to adapt the partitioning to drought stress conditions. The lg-transformed root-weighted soil water potential in the rooting zone (lgw root , lg(hPa)), calculated as a function of measured water contents and simulated root distribution, was used as a drought stress indicator. The linear correction term assumes an increase of the stem fraction, proportional to the difference between lgw root and a drought stress threshold (pF crit , lg(hPa)). The analysis revealed that the shift in allometric partitioning towards stem fraction starts with lgw root greater than 1.92 [lg (hPa)]. The slope of the relative increase of dry matter allocated to the stem fraction was determined with 0.26 [lg(hPa) À1 ]. Both parameters of the correction term were found to be highly significant. Implications for crop modelling are discussed.

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Section: Discussionmentioning

confidence: 99%

A Simple Drought‐Sensitive Model for Leaf : Stem Partitioning of Wheat

Ratjen

Neukam

Kage

2016

J Agronomy Crop Science

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“…Dentre esses indicadores, pode-se citar a temperatura foliar (Kirkham, 2005), o conteú-do relativo de água na folha (Katerji et al, 1988;Lafitte, 2002), a condutância estomática (Kochler et al, 2007), o potencial da água na folha e no solo (Katerji et al, 1988;Bergonci et al, 2000), dentre outros.…”

Section: Introductionunclassified

Caracterização Do Tomateiro Submetido Ao Déficit Hídrico

Morales¹,

Resende

Bordini

et al. 2015

RSA

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RESUMOO experimento foi conduzido com o objetivo avaliar as características morfofisiológicas do tomateiro quando submetido a diferentes níveis de déficit hídrico e, com base nesses resultados, indicar os melhores caracteres para seleção de plantas com maior resistência ao déficit hídrico. O delineamento experimental foi em blocos casualizados, com quatro repetições, no esquema de parcelas subdivididas, em que os tratamentos principais (parcelas) foram constituídos por duas linhagens (TOM-684 e M-82) e as subparcelas por quatro níveis de umidade do solo (100 %, 75 %, 50 % e 25 % da capacidade de campo). Foram avaliados os seguintes caracteres: produção de frutos, massa fresca e seca das folhas, caule e sistema radicular, diâmetro do caule, altura das plantas, número de folhas, fotossíntese, transpiração, temperatura foliar, umidade intercelular, dióxido de carbono intercelular, condutância estomática, condutância de CO 2 intercelular e condutância total. Com a redução da umidade do solo houve redução do número de folhas, altura das plantas, massa fresca e seca das folhas, caule e sistema radicular, transpiração, taxa fotossintética, produção de frutos e aumento da temperatura foliar. A condutância estomática diferiu entre as duas linhagens, com maiores valores para a cultivar TOM-684, que reduziu a condutância estomática de 0,70 para 0,25 mol m -2 s -1 entre os níveis de 100 e 25 % da capacidade de campo. A altura das plantas e o número de folhas podem ser utilizadas em programas de melhoramento como ferramenta para seleção de plantas com maior resistência ao déficit hídrico.Palavras-chave: Solanum lycopersicum; Tolerância a seca; Déficit hídrico; Eficiência do uso da água. ABSTRACTThe experiment was conducted to evaluate the morphological/physiological characteristics of tomato plants when submitted to different levels of water deficit and, based on these results, indicate the best characters for the selection of plants with more tolerance to water deficit. The experimental delineation was in randomized complete block design, with four replications, arranged in splitplot, in which the main treatments (plots) were composed by two strains (TOM-684 and M-82) and the subplots, by four levels of soil moisture (100 %, 75 %, 50 % and 25 % of the field capacity). The following parameters were evaluated: fruit production, leaf, stem and root system fresh and dry mass, , stem diameter, plant height, number of leaves, photosynthesis, transpiration, foliar temperature, intracellular moisture, intracellular carbon dioxide, stomatal conductance, conductance of intracellular CO 2 and total conductance. With the reduction of soil moisture occurred reduction in the number of leaves, plant height and leaf, stem and root system fresh and dry mass, transpiration, photosynthetic rate, fruit production and increase of foliar temperature The stomatal conductance differed between both strains, with higher values for the TOM-684 strain, which reduced stomatal conductance from 0,70 to 0,25 mol m -2 s -1 between levels of 100 and 25 % of...

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“…Water supply is a major constraint to crop production in the Mediterranean region of Turkey. The precise determination of irrigation water requirement is an important prerequisite for high irrigation water use efficiency (Kochler et al, 2007).…”

Section: Introductionmentioning

confidence: 99%