Assessing Spatial Variability of Grape Skin Flavonoids at the Vineyard Scale Based on Plant Water Status Mapping

Proximal sensing is used in vineyards to precisely monitor and manage spatial and temporal variability while reducing laborious and repetitive measurements. Soil electrical conductivity (EC) and canopy vegetation indexes are two frequently assessed variables with off-the-shelf sensors. In this study, the ecophysiological variability of a commercial vineyard comprising three varieties in three blocks, Cabernet-Sauvignon (CS), Cabernet franc (CF), and Petit Verdot (PV), was investigated. Random sampling was used to continuously assess spatial variability in plant physiology and berry composition. Soil EC and NDVI were also continuously monitored throughout the season. There was a noticeable spatial pattern in the normalised differential vegetation index (NDVI) in the vineyard and soil EC. The spatial pattern of NDVI can be partially elucidated by the season-long stem water potential (Ψstem), which was lowest in the CS block. However, leaf photosynthesis did not match this spatial pattern. The spatial distribution of NDVI and soil EC did not satisfactorily explain the spatial variations in yield components and berry chemistry. Principal component analyses (PCA) were performed resulting in a clear discrimination of each of the three cultivars. Soil EC showed a significant relationship with Ψstem integrals, total skin anthocyanins and tri- to di-hydroxylated flavonoids. In each cultivar block, soil EC showed some capability to be related to plant water status, and NDVI showed a relationship with yield. Overall, this study provided evidence of the spatial variability of grapevine physiology in a commercial vineyard with three cultivars. Also, it showed that the cultivar effect and uniform crop level management can diminish the efficiency of proximal sensing, thus weakening the relationship of soil and canopy indexes with plant physiology and berry chemistry. Nonetheless, our study showed that it is possible to apply temporal proximal sensing methods when assessing plant water status, primary metabolism, yield and berry secondary metabolism, which give an indication of the possibility of managing the spatial variability of both plant physiology and berry chemistry.

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Temporal and Spatial Variability of Plant Water Status and Leaf Gas Exchange

Ecological Studies - Arid Dune Ecosystems ◽

10.1007/978-3-540-75498-5_25 ◽

2008 ◽

pp. 367-375

Author(s):

M. Veste

Keyword(s):

Gas Exchange ◽

Spatial Variability ◽

Leaf Gas Exchange ◽

Water Status ◽

Plant Water Status ◽

Plant Water ◽

Temporal And Spatial Variability ◽

Temporal And Spatial

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Is it possible to assess the spatial variability of vine water status?

OENO One ◽

10.20870/oeno-one.2008.42.4.811 ◽

2008 ◽

Vol 42 (4) ◽

pp. 203 ◽

Cited By ~ 9

Author(s):

César Acevedo-Opazo ◽

Bruno Tisseyre ◽

Hernán Ojeda ◽

Samuel Ortega-Farias ◽

Serge Guillaume

Keyword(s):

Spatial Variability ◽

Water Status ◽

Auxiliary Information ◽

Growth Cycle ◽

Plant Water Status ◽

Plant Water ◽

Conceptual Approach ◽

Direct Measurements ◽

Local Reference ◽

Status Assessment

Aims: Plant water status monitoring during the vineyard growth cycle constitutes a basic parameter for both harvest quality and vineyard management. Unfortunately, the plant water status measurement requires skills and heavy devices which drastically limit the number of repetitions either in space or in time. Moreover, due to the significant spatial variability in viticulture, extrapolation of one local measurement to a larger scale, vine field or vineyard, is difficult. Therefore, the design of tools and methods to characterize and to assess the spatial variability of plant water status constitutes a big challenge. The aim of this paper is to propose an approach allowing the spatial variability of the plant water status to be assessed.Methods and results: This work proposes a complete literature review of previous works using different approaches to assess the vine water status. Based on this review, it leads to a conceptual approach considering the Spatial (S) and Temporal (T) variability of the plant water status assessment at a whole vineyard scale. This paper is divided into three sections: (i) description of plant water status reference methods based on direct measurements on the plant, (ii) plant water status assessment methods based on auxiliary information (i.e. weather, soil and plant vegetative expression), and finally (iii) a proposal for combining local reference measurement and auxiliary information to characterize the spatial variability of the vine water status at the vineyard scale.Conclusion: Taking into account restrictive assumptions, this paper points out the possibility to provide relevant spatial assessment of the vine water status. This possibility is illustrated with a simple example.Significance and impact of the results: This work gives an answer to the significant problem of vine water status assessment over space. It proposes an approach based on high spatial resolution auxiliary information to extrapolate a measurement (PLWP or SWP) made at a given time on a reference site. This proposal determines the different steps for further investigations aiming at proposing a spatial model of vine water status.

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The Method of Plant Water Status Measurement in Sweet Potato (Ipomoea Batatas (L) Lam.)

Beccariana Botanical Research Bulletin ◽

10.30862/bbrp.v7i1.274 ◽

2010 ◽

Vol 7 (1) ◽

Author(s):

Saraswati Prabawardani

Keyword(s):

Water Content ◽

Sweet Potato ◽

Relative Water Content ◽

Water Status ◽

Plant Water Status ◽

Equilibration Time ◽

Plant Water ◽

Font Size ◽

Potato Leaf ◽

Relative Water

The measurement of plant water status such as leaf water potential (LWP) and leaf relative water content (RWC) is important part of understanding plant physiology and biomass production. Preliminary study was made to determine the optimum amount of leaf abrasion and equilibration time of sweet potato leaf inside the thermocouple psychrometer chambers. Based on the trial, the standard equilibration time curve of a Peltier thermocouple for sweet potato leaf was between 2 and 3 hours. To increase the water vapour conductance across the leaf epidermis the waxy leaf cuticle should be removed or broken by abrasion. The result showed that 4 times leaf rubbings was accepted as the most effective way to increase leaf vapour conductance of sweet potato in the psychrometer chambers. In calculating the leaf relative water content, unstressed water of sweet potato leaves require 4 hours imbibition, whereas water stressed of sweet potato leaves require 5 to 6 hours to reach the saturation time. Either leaf water potential or relative water content can be used as a parameter for plant water status in sweet potato.

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Plant Water Status in Relation to Clouds 1

Agronomy Journal ◽

10.2134/agronj1973.00021962006500040045x ◽

1973 ◽

Vol 65 (4) ◽

pp. 677-678 ◽

Cited By ~ 15

Author(s):

J. R. Stansell ◽

Betty Klepper ◽

V. Douglas Browning ◽

H. M. Taylor

Keyword(s):

Water Status ◽

Plant Water Status ◽

Plant Water

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White Clover Seed Production: II. Soil and Plant Water Status on Yield and Yield Components

Crop Science ◽

10.2135/cropsci1994.0011183x003400030030x ◽

1994 ◽

Vol 34 (3) ◽

pp. 768-774 ◽

Cited By ~ 10

Author(s):

R. N. Oliva ◽

J. J. Steiner ◽

W. C. Young

Keyword(s):

Seed Production ◽

White Clover ◽

Yield Components ◽

Water Status ◽

Plant Water Status ◽

Plant Water ◽

Yield And Yield Components ◽

Clover Seed

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Capability of leaf water content and its threshold values in reflection of soil–plant water status in maize during prolonged drought

Ecological Indicators ◽

10.1016/j.ecolind.2021.107395 ◽

2021 ◽

Vol 124 ◽

pp. 107395

Author(s):

Huailin Zhou ◽

Guangsheng Zhou ◽

Qijin He ◽

Li Zhou ◽

Yuhe Ji ◽

...

Keyword(s):

Water Content ◽

Water Status ◽

Leaf Water ◽

Plant Water Status ◽

Leaf Water Content ◽

Plant Water ◽

Threshold Values ◽

Prolonged Drought

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Visual estimation of plant water status in cereals

The Journal of Agricultural Science ◽

10.1017/s0021859600060524 ◽

1979 ◽

Vol 92 (1) ◽

pp. 83-89 ◽

Cited By ~ 13

Author(s):

H. G. Jones

Keyword(s):

Spring Wheat ◽

Water Status ◽

Plant Morphology ◽

Leaf Water ◽

Plant Water Status ◽

Plant Water ◽

Visual Estimation ◽

Leaf Water Status ◽

Visual Scoring ◽

Breeding Programmes

SummaryThe potential offered for plant breeding programmes by visual scoring techniques for plant water status was investigated in rice and spring wheat. It was found that differing plant morphology could seriously bias visual estimates of leaf water potential, particularly in spring wheat. In spite of this problem, it was found that at least for rice, this type of approach may have potential in future breeding programmes where an estimate of leaf water status is required, such as those for drought tolerance, so long as a high intensity of selection is not necessary.

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