Stomatal responsiveness to leaf water status in common bean (<i>Phaseolus vulgaris</i> L.) is a function of time of day

Mencuccini, Maurizio; Mambelli, Stefania; Comstock, Jonathan P.

doi:10.1046/j.1365-3040.2000.00617.x

Cited by 64 publications

(50 citation statements)

References 47 publications

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“…Moreover, the paraheliotropic soybean leaf movement and stomatal closure acted in parallel, beginning at approximately -0.4MPa (Berg & Heuchelin, 1990). On the other hand, even under constant environmental conditions the daily oscillations of many physiological processes were observed, as in photosynthesis (Dodd et al, 2005), or in stomatal opening and assimilation rate (Mencuccini et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

Heliotropic responses of soybean cultivars at three phenological stages and under two water regimes

Rakocevic

Neumaier

Oliveira

et al. 2010

Pesq. agropec. bras.

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-The objectives of this work were to determine the heliotropic movements of the upper trifoliates for two soybean cultivars, BR 16 and Embrapa 48, during a daily cycle, in three phenological stages and two water regimes, and to estimate the impact of irrigation and daily leaflet movements on agronomic characteristics and grain yield. Heliotropic movements were studied in three phenological stages: V4-V6, V7-V10, and R5 in irrigated and non-irrigated plots. For each stage, the leaflet elevation and azimuth were measured hourly. Under a low (V4-V6 stage) and mid (V7-V10 stage) leaf area index (LAI) the diaheliotropism was slightly more frequent and intensive in non-irrigated than in irrigated plants, only at early morning and late afternoon hours. At R5 stage (high LAI) the paraheliotropism of superior trifoliates was predominant and more intensive in non-irrigated plants. The heliotropic movements are correlated to carbon gain, but not to environment (light intensity or temperature), for measurements at 11h. 'Embrapa 48' expresses greater paraheliotropism than 'BR 16' at high LAI, while 'BR 16' displays lower heliotropic plasticity under irrigation. In spite of significant heliotropic differences, genotype and water availability treatments did not influence the final grain yield.Index terms: Glycine max, diaheliotropism, irrigation, leaf area index, paraheliotropism. Respostas heliotrópicas de cultivares de soja em três estádios fenológicos e dois regimes hídricosResumo -Os objetivos deste trabalho foram determinar o movimento heliotrópico dos trifólios superiores de duas cultivares de soja, BR 16 e Embrapa 48, durante o dia, em três estádios fenológicos e em dois regimes hídricos e determinar o impacto da irrigação e do movimento foliar diário nas características agronômicas e na produção de grãos. Movimentos heliotrópicos foram determinados a cada hora, em três estádios fenológicos: V4-V6, V7-V10 e R5, em parcelas irrigadas e não irrigadas. Para cada estágio, a elevação do folíolo e o azimute foram medidos por hora. Em índices de área foliar (IAF) baixo e médio (V4-V6 e V7-V10), o diaheliotropismo foi levemente mais intenso e frequente nas plantas sem irrigação do que nas irrigadas, e somente nas primeiras horas matinais e últimas horas da tarde. Em R5 (alto IAF), o paraheliotropismo dos trifólios superiores foi predominante e mais intenso em plantas não irrigadas. Os movimentos heliotrópicos se correlacionaram com o ganho de carbono mas não com o ambiente (intensidade de luz ou temperatura), para medidas às 11 horas. 'Embrapa 48' apresenta maior paraheliotropismo do que 'BR 16', em plantas com alto IAF enquanto 'BR 16' apresenta menor plasticidade nas respostas heliotrópicas nas parcelas irrigadas. Apesar de diferenças no heliotropismo, o genótipo e disponibilidade de água não influenciaram a produção de grãos.Termos para indexação: Glycine max, cosseno, diaheliotropismo, irrigação, índice de área foliar, paraheliotropismo.

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Section: Resultsmentioning

confidence: 99%

Heliotropic responses of soybean cultivars at three phenological stages and under two water regimes

Rakocevic

Neumaier

Oliveira

et al. 2010

Pesq. agropec. bras.

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“…Using a steady-state model, a sinusoidal pattern of light will result in a similar symmetrical pattern of g s , which, when measured under these conditions, may not be the case, as observed in Figure 1. Over the diurnal period, a number of species display a decrease in g s and A that is not driven by decreases in light intensity or the temporal response of g s (Mott and Parkhurst, 1991;Allen and Pearcy, 2000;Mencuccini et al, 2000;Moriana et al, 2002;Dodd et al, 2006;de Dios et al, 2012), but the exact mechanism for this requires further investigation. As discussed earlier, sugar accumulation due to high A is believed to provide a long-term photosynthetic feedback on g s (Lu et al, 1995(Lu et al, , 1997Outlaw, 2003;Kang et al, 2007;Kelly et al, 2013), which also needs to be taken into account when considering the incorporation of temporal responses into models of stomatal behavior.…”

Section: Diurnal Impact On Stomatal Behavior and Implications For Futmentioning

confidence: 99%

Diurnal Variation in Gas Exchange: The Balance between Carbon Fixation and Water Loss

2017

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Stomatal control of transpiration is critical for maintaining important processes, such as plant water status, leaf temperature, as well as permitting sufficient CO 2 diffusion into the leaf to maintain photosynthetic rates (A). Stomatal conductance often closely correlates with A and is thought to control the balance between water loss and carbon gain. It has been suggested that a mesophyll-driven signal coordinates A and stomatal conductance responses to maintain this relationship; however, the signal has yet to be fully elucidated. Despite this correlation under stable environmental conditions, the responses of both parameters vary spatially and temporally and are dependent on species, environment, and plant water status. Most current models neglect these aspects of gas exchange, although it is clear that they play a vital role in the balance of carbon fixation and water loss. Future efforts should consider the dynamic nature of whole-plant gas exchange and how it represents much more than the sum of its individual leaf-level components, and they should take into consideration the long-term effect on gas exchange over time.As the waxy surface of most leaves makes them virtually impermeable to CO 2 and water, nearly all CO 2 absorbed by the plant and water lost pass through the stomatal pores (Cowan and Troughton, 1971;Caird et al., 2007;Jones, 2013). Although these pores represent only a small fraction of the leaf surface, stomatal behavior has major consequences for photosynthetic CO 2 fixation and water loss from leaf to canopy levels, influencing carbon and hydrological cycles at global scales (Hetherington and Woodward, 2003;Keenan et al., 2013). Guard cells that surround the stomatal pore open and close in response to environmental stimuli, controlling the flux of gas between the leaf interior and the bulk atmosphere. Stomatal conductance (g s ) appears to be closely linked with mesophyll demands for CO 2 , and a strong correlation between photosynthetic rate (A) and g s is often observed (Wong et al., 1979;Farquhar and Sharkey, 1982;Mansfield et al., 1990;Buckley and Mott, 2013), and although conserved, it is not always constant (Lawson and Morison, 2004;Bonan et al., 2014). However, the A and properties of each leaf may not be identical and depend on acclimation to the surrounding microclimatic conditions; therefore, each leaf could be considered unique (Niinemets, 2016).In order to maintain an appropriate water status, plants must balance water loss between leaves with different properties depending on the availability of soil water, which raises the question about the regulation of g s at the whole-plant level. Early experiments by Meinzer and Grantz (1990) showed that the balance between water loss and water transport capacity enables the maintenance of a constant leaf water status over a wide range of plant sizes and growing conditions. Therefore, plants regulate the transpiration of each leaf independently in response to variations in microclimate by constantly adjusting stomatal aperture. The sto...

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“…there is evidence to suggest that the rapidity of stomatal responses may change at different 122 times of day (Mencuccini et al, 2000;Tallman, 2004). Additionally, changes in g s to…”

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confidence: 99%

“…fluctuations in water status have been shown to restrict A depending on the time of day and 124 stomata have been reported to be more responsive to ABA in the morning compared with 125 the afternoon (Mencuccini et al, 2000). It has been recognized that the circadian clock at 126 least in part controls these diurnal modifications in A and g s responses over the diurnal 127 period (e.g.…”

mentioning

confidence: 99%

Acclimation to Fluctuating Light Impacts the Rapidity of Response and Diurnal Rhythm of Stomatal Conductance

2018

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Stomatal responsiveness to leaf water status in common bean (Phaseolus vulgaris L.) is a function of time of day

Cited by 64 publications

References 47 publications

Heliotropic responses of soybean cultivars at three phenological stages and under two water regimes

Heliotropic responses of soybean cultivars at three phenological stages and under two water regimes

Diurnal Variation in Gas Exchange: The Balance between Carbon Fixation and Water Loss

Acclimation to Fluctuating Light Impacts the Rapidity of Response and Diurnal Rhythm of Stomatal Conductance

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