Gas Exchange and Chlorophyll Fluorescence Response to Simulated Rainfall in Hedysarum fruticosum var. mongolicum

Niu, Shuli; Li, L.H.; Jiang, Gaoming; Gao, Lian‐Ming; Li, Y.G.; Peng, Yu; Liu, M.Z.

doi:10.1023/b:phot.0000040562.34339.b3

Cited by 13 publications

(10 citation statements)

References 25 publications

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“…Auge et al (1998) observed the foliar dehydration tolerance and Liu et al (2003) measured, among other factors, stomatal conductance and leaf water potential in sand rice (Agriphyllum squarrosum) using a WAM, and observed that the increase in soil water content significantly affected the physiological traits analyzed, while the change in the photosynthesis was delayed as compared to changes in water potential. Starting the current trend for the use of WAM, Niu et al (2004) studied other aspects such as gas exchange and chlorophyll fluorescence response to simulated rainfall in plants under water stress by measuring leaf water potential. Other authors such as YuBing et al (2007), Xu and Zhou (2008), and Li et al (2010) used WAM in their research, but the suitability of the use of this type of TCP in the field has not been verified.…”

Section: Measurement Of Leaf Water Potentialmentioning

confidence: 99%

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Martínez¹,

Cancela²,

García³

et al. 1970

Span. j. agric. res.

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For years, one of the major concerns of agronomists has been the study of how variations in the crop environment can affect proper crop development. A variety of factors must be considered, including factors such as plant genetics, climatic conditions or soil, and factors directly dependent on man such as technology or labour. In the search for sustainable development, all these factors must coexist in perfect harmony in order AbstractThe determination of leaf water potential is useful in the establishment of irrigation guidelines for agricultural crop management practices and requires the use of various methods, among which thermocouple psychrometers (TCP). TCP have been widely used for this purpose. However, the psychrometric technique is complex and difficult to understand and the instrumentation required is difficult to handle. For this reason, a profound knowledge of the different aspects involved in the technique -which have not been clearly explained in the literature-is required. This paper reviews a number of research areas of TCP and focuses on three very specific fields: a) main applications of phsychrometry in field studies; b) determination of the measurement accuracy of psychrometric equipment, accuracy per se and accuracy tested against alternative methods; c) main errors and handling difficulties of TCP in the field. Research in these areas provides an updated overview of TCP as a method for determining water relations in plant material that will contribute criteria to select the most suitable technique according to the type of plant material and the purpose of the research and will highlight the types of instruments, accuracies and errors that have detrimental effects on measurements.Additional key words: hygrometric technique; irrigation; isopiestic technique; pressure chamber; psychrometric technique. ResumenRevisión. Aplicación de la psicrometría en campo a material vegetal: precisión y dificultades de manejo La determinación del potencial hídrico foliar es muy útil en el establecimiento de directrices de riego en las prácti-cas de manejo agrícola de los cultivos, requiriéndose del uso de diferentes métodos como los psicrómetros termopar (TCP). Los TCP han sido ampliamente utilizados. Sin embargo, se trata de una técnica compleja de difícil manejo. Por lo tanto, se requiere un profundo conocimiento de los diferentes aspectos involucrados en la técnica, que no han sido claramente explicados en los diferentes estudios publicados. Este artículo revisa una serie de líneas de investigación de los TCP. Estas áreas de investigación se han centrado en tres campos muy específicos: a) principales actuaciones en campo empleando la psicrometría; b) especificación de la precisión de los equipos, per se y frente a otras metodologías alternativas; c) principales errores y dificultades de manejo en campo de los psicrómetros. La investigación en esta área permitirá aportar una visión actualizada sobre los TCP como método de determinación de relaciones hídricas en material vegetal, aportando criterios de sele...

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Section: Measurement Of Leaf Water Potentialmentioning

confidence: 99%

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Martínez¹,

Cancela²,

García³

et al. 1970

Span. j. agric. res.

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“…High xylem hydraulic conductivity enables better hydration of transpiring leaves that supports high stomatal conductance and potentially high photosynthetic efficiency (Santiago et al, ; Zhang & Cao, ; Hao et al, ). Previous studies showed that H. fruticosum has photosynthetic traits comparable with that of the C 4 plants, such as high light saturation point, low dark respiration rate, and low intercellular CO 2 concentrations (Niu et al, , ). The potentially fast growth of H. fruticosum facilitated by high hydraulic efficiency and photosynthetic capacity has likely been made possible by a relatively high soil water availability at the early stage of sand dune fixation.…”

Section: Discussionmentioning

confidence: 99%

“…Both shrub species are generally regarded as drought tolerant and well adapted to the sand dune environments. H. fruticosum is a fast‐growing pioneer species that can quickly obtain relatively large biomass and occupy a dominant position within around 3 years after planted (Niu et al, ). However, C. microphylla performs better after the fixation of the dunes and takes over the dominant position later on.…”

Section: Introductionmentioning

confidence: 99%

Switching of dominant positions between two sand‐fixing shrub species during the dune revegetation process is underlain by their contrasting xylem hydraulics and water‐use strategies

et al. 2020

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Differences in key physiological characteristics between plant species can result in their contrasting performances in vegetation restoration projects, but ecophysiological comparative studies in close relation to ecological restoration projects are scarce. Hedysarum fruticosum Pall. and Caragana microphylla Lam. are two leguminous shrub species widely used in combination for fixation of active sand dunes in semiarid regions of northern China, but they clearly differ in fitness at different stages of dune vegetation development; that is, H. fruticosum quickly gains a community dominance at the initial stage but yields to C. microphylla in a few years after the fixation of dunes. To reveal the underlying mechanism of such a pattern, key physiological characteristics related to xylem water transport, leaf water use, and drought tolerance were compared between these two species at a typical site of sand dune fixation project in Inner Mongolia. Compared with C. microphylla, H. fruticosum shows an acquisitive and risky water management strategy with substantially higher hydraulic efficiency and photosynthetic capability but reduced resistance to drought‐induced xylem embolism, which endows it an advantage under conditions of relatively high soil water availability at the early stage of dune fixation. In contrast, C. microphylla exhibits more conservative water use and characteristics of greater drought tolerance, which results in greater dominance under the more drought‐stressed conditions of the later stage of dune fixation. Our study for the first time provides a potential mechanistic explanation for the clear switching of dominant positions between the two important sand‐fixing shrub species during the sand dune revegetation process.

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“…The measurements were made between 9:00 and 11:00 h. The following parameters were determined and calculated: the rate of net photosynthesis (PN) and transpiration (E), stomatal conductance (gs), and internal CO2 concentration (Ci). Apparent carboxylation efficiency (PN/Ci) was calculated according to Niu et al (2004), instantaneous (WUE, PN/E), and intrinsic water-use efficiencies (WUEi, PN/gs) according to Medrano et al (2015). The measurements included ten replicates per each treatment.…”

Section: Methodsmentioning

confidence: 99%

Photosynthetic activity of common buckwheat (Fagopyrum esculentum Moench) exposed to thermal stress

Hornyák¹,

Płażek²,

Kopeć³

et al. 2020

Photosynt.

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The aim of the work was to investigate thermal stress effect on photosynthetic activity of common buckwheat. Seedlings of common buckwheat were exposed to 20°C (control) and 30°C (thermal stress). The research involved the Polish cultivar 'Panda' and strain PA15 and determined kinetics of chlorophyll a fluorescence (Chlf), leaf gas exchange, soluble carbohydrate (SC) content in donor leaves, electrolyte leakage as a parameter of cell membrane permeability, and amount of abscisic acid and jasmonates. In 'Panda' and PA15 plants grown at 30°C, most of Chlf parameters improved. 'Panda' plants grown at 30°C demonstrated a higher increase in net photosynthetic rate, lower transpiration rate, and smaller SC reduction than those of PA15 strain. At this temperature, 'Panda' leaves accumulated greater amounts of jasmonates than that of the control. We concluded that studied genotypes demonstrated disparate responses to thermal stress, but for both, 30°C is more favourable temperature for vegetative growth than 20°C.

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Gas Exchange and Chlorophyll Fluorescence Response to Simulated Rainfall in Hedysarum fruticosum var. mongolicum

Cited by 13 publications

References 25 publications

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Switching of dominant positions between two sand‐fixing shrub species during the dune revegetation process is underlain by their contrasting xylem hydraulics and water‐use strategies

Photosynthetic activity of common buckwheat (Fagopyrum esculentum Moench) exposed to thermal stress

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