Comparing vegetation indices for remote chlorophyll measurement of white poplar and Chinese elm leaves with different adaxial and abaxial surfaces

Lu, Shouxiang; Lu, Xiaobin; Zhao, Wenli; Liu, Yü; Wang, Zheyi; Omasa, Kenji

doi:10.1093/jxb/erv270

Cited by 62 publications

(53 citation statements)

References 44 publications

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“…Leaf chlorophyll content is the key parameter for characterization of the physiological performance of plants, including the determination of vegetation indices with woody species (Lu et al, 2015). Under greenhouse conditions, leaves of the tetraploid plants contained significantly greater concentrations of chlorophylls and carotenoids than the diploid plants (Table III).…”

Section: Phenotyping Green Shoot Surface Area During Early Growth Of mentioning

confidence: 99%

Response of Organ Structure and Physiology to Autotetraploidization in Early Development of Energy Willow Salix viminalis

et al. 2016

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The biomass productivity of the energy willow Salix viminalis as a short-rotation woody crop depends on organ structure and functions that are under the control of genome size. Colchicine treatment of axillary buds resulted in a set of autotetraploid S. viminalis var. Energo genotypes (polyploid Energo [PP-E]; 2n = 4x = 76) with variation in the green pixel-based shoot surface area. In cases where increased shoot biomass was observed, it was primarily derived from larger leaf size and wider stem diameter. Autotetraploidy slowed primary growth and increased shoot diameter (a parameter of secondary growth). The duplicated genome size enlarged bark and wood layers in twigs sampled in the field. The PP-E plants developed wider leaves with thicker midrib and enlarged palisade parenchyma cells. Autotetraploid leaves contained significantly increased amounts of active gibberellins, cytokinins, salicylic acid, and jasmonate compared with diploid individuals. Greater net photosynthetic CO 2 uptake was detected in leaves of PP-E plants with increased chlorophyll and carotenoid contents. Improved photosynthetic functions in tetraploids were also shown by more efficient electron transport rates of photosystems I and II. Autotetraploidization increased the biomass of the root system of PP-E plants relative to diploids. Sections of tetraploid roots showed thickening with enlarged cortex cells. Elevated amounts of indole acetic acid, active cytokinins, active gibberellin, and salicylic acid were detected in the root tips of these plants. The presented variation in traits of tetraploid willow genotypes provides a basis to use autopolyploidization as a chromosome engineering technique to alter the organ development of energy plants in order to improve biomass productivity.

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Section: Phenotyping Green Shoot Surface Area During Early Growth Of mentioning

confidence: 99%

Response of Organ Structure and Physiology to Autotetraploidization in Early Development of Energy Willow Salix viminalis

et al. 2016

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“…This index showed a very strong ability to relate LCC in the different viewing angle datasets for all plant species and had a relatively good relationship with the dataset for each plant species. The MDatt performed better than the other spectral indices because the ratio of the difference between spectral reflection at different wavelengths was insensitive to leaf surface structure variations in the different plant species (Datt, , ; Lu et al, , ; Sims & Gamon, ).…”

Section: Resultsmentioning

confidence: 99%

“…We also evaluated the MDatt index using published results from other datasets, which were measured using leaf clips (Lu et al, ; Lu et al, ). The statistical results of all leaf sample chlorophyll contents are shown in Table S3, and the seven plant species examined are as follows: Elaeagnus angustifolia L. (Ela), Populus alba (Poa), Rhus typhina (Rhy), Ulmus pumila var.…”

Section: Resultsmentioning

confidence: 99%

“…The method of a modified Datt index (MDatt), which was proposed in our recent study (Lu et al, 2015), was also used in this study. Based on a semiempirical model of leaf reflection (Baret et al, 1988), the specular reflection from a leaf surface, which is assumed to be spectrally flat, can be reduced by the difference between two wavelengths (Datt, 1999;Penuelas et al, 1995;Sims & Gamon, 2002).…”

Section: Spectral Indicesmentioning

confidence: 99%

“…Spectral indices have been developed to estimate LCC using the reflection at different wavelengths (Carter & Knapp, 2001;Datt, 1999;Gates, Keegan, Schleter, & Weidner, 1965;Gitelson, Keydan, & Merzlyak, 2006;Richardson et al, 2002;Sims & Gamon, 2002;Tucker, 1979), and most previous studies on the estimation of LCC were performed using a spectrophotometer with an integrating sphere, in which the angular reflection is ignorable, because light reflected from various angle is integrated (Gitelson et al, 2003;Penuelas et al, 1995), using a leaf clip, in which the optic fibre was held at a fixed angle and was slightly off (Lu et al, 2015;Sims & Gamon, 2002) or using the reflection measured in one specific direction with different viewing and incident geometry (Datt, 1999;Filella & Penuelas, 1994;Vogelmann, Rock, & Moss, 1993). However, if these spectral indices are used in the field, it is needed to consider the angular reflection properties of leaves because the plant leaves have various angles.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the leaf chlorophyll content using multiangular spectral reflectance factor

Sun

et al. 2019

Plant Cell & Environment

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Chlorophyll is one of the primary pigments of plant leaves, and changes in its content can be used to characterize the physiological status of plants. Spectral indices have been devised and validated for estimating leaf chlorophyll content (LCC). However, most of the existing spectral indices do not consider the influence of angular reflection on the accuracy of the LCC estimation. In this study, the spectral reflectance factors of leaves from three plant species were measured from several observations in the principal plane. The relationship between the existing spectral indices and the LCC from different directions suggests that the directional reflection of a leaf surface impacts the accuracy of its LCC estimation. Subsequently, the ratio of reflectance differences, that is, the modified Datt index, was tested to reduce the directional reflection effect when predicting LCC. Our results indicated that the modified Datt index not only estimated LCC with high accuracy for all observation directions and plant species but also consistently predicted the LCC of each species in individual observation directions. Our method opens the possibility for optical detection of LCC using multiangular spectral reflection, which is convenient for plant science studies focused on the variation in LCC.

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Plant Photosynthetic Pigments: Methods and Tricks for Correct Quantification and Identification

Fernández‐Marín

Garcı́a-Plazaola

Hernández

et al. 2018

Advances in Plant Ecophysiology Techniques

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Comparing vegetation indices for remote chlorophyll measurement of white poplar and Chinese elm leaves with different adaxial and abaxial surfaces

Abstract: HighlightA new vegetation index insensitive to adaxial and abaxial leaf surfaces was proposed in this paper to accurately estimate leaf chlorophyll content.

Cited by 62 publications

References 44 publications

Response of Organ Structure and Physiology to Autotetraploidization in Early Development of Energy Willow Salix viminalis

Response of Organ Structure and Physiology to Autotetraploidization in Early Development of Energy Willow Salix viminalis

Estimation of the leaf chlorophyll content using multiangular spectral reflectance factor

Plant Photosynthetic Pigments: Methods and Tricks for Correct Quantification and Identification

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