Ratio analysis of reflectance spectra (RARS): An algorithm for the remote estimation of the concentrations of chlorophyll A, chlorophyll B, and carotenoids in soybean leaves

Chappelle, Emmett W.; Kim, Moon S.; McMurtrey, J. E.

doi:10.1016/0034-4257(92)90089-3

Cited by 706 publications

(371 citation statements)

References 13 publications

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“…Because clones 3 and 6 probably had a lower competitive capacity (for nutrient uptake), they exhibited lower chlorophyll concentrations than clone 4 (which grew more). In addition, several studies have highlighted that the amount of chlorophylls is directly related to the photosynthetic rate and consequently, plant growth and dry biomass production (Porra et al, 1989;Chappelle and Kim, 1992;Ripullone et al, 2003). Therefore, the present results (Tables 1 to 6) indicate that clones 3 and 6 suffered more from weed competition, whereas clones 1 and 4 were more tolerant of weed coexistence.…”

Section: Discussionsupporting

confidence: 54%

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Colmanetti¹,

Bacha²,

Braga³

et al. 2017

Aust J Crop Sci

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Weeds play a strong pressure on the eucalyptus early growth, leading to a delay in their development. Therefore, many studies have tried to identify eucalyptus clones that are more tolerant to weed competition to supply information to producers, genetic improvement programs and the scientific community. The objective of this study was evaluate the interference of signal grass (Urochloa decumbens) and guinea grass (Panicum maximum) in the early growth of six clones of Eucalyptus urograndis, as well as the reciprocal effect. The experiment was conducted in an open and semi-controlled area in 8-L pots using a completely randomized experimental design with a 3 x 6 factorial scheme (U. decumbens, P. maximum and weed-free control and six eucalyptus clones). After ninety days of planting, the following variables were measured: eucalyptus stem diameter, height, total chlorophyll concentration, chlorophyll fluorescence (Fv/Fm), net assimilation rate and eucalyptus and weed dry biomass. In coexistence with Guinea grass (Panicum maximum), clone 3 (ms 709 H) exhibited a 78.2% reduction in dry biomass compared to clone 4 (C 219 H), which obtained the highest dry biomass. In coexistence with signal grass (Urochloa decumbens), clone 6 (ms 686 H) was the most negatively affected by weed competition, with an 80.7% lower dry biomass than clone 4. In general, clones 1 (ms 710 H), 2 (H 1069) and 4 were more resistant, and clones 3 and 6 were more sensitive to weed interference. Both weeds were affected by eucalyptus, but Guinea grass was more sensitive than signal grass.

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Section: Discussionsupporting

confidence: 54%

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Colmanetti¹,

Bacha²,

Braga³

et al. 2017

Aust J Crop Sci

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“…The 524 and 576 nm bands are located beside the green peak. The band at 576 nm coincides with one of the absorption bands of chlorophyll a (Chappelle et al, 1993). The 1 510 nm band is dominated by absorption features due to N-H bond stretching (Curran, 1989).…”

Section: Physical Meanings Of the Selected Wavebandsmentioning

confidence: 65%

Optimal waveband identification for estimation of leaf area index of paddy rice

Wang

Huang

Zhou

et al. 2008

J. Zhejiang Univ. Sci. B

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Abstract:The objectives of the study were to select suitable wavebands for rice leaf area index (LAI) estimation using the data acquired over a whole growing season, and to test the efficiency of the selected wavebands by comparing them with feature positions of rice canopy spectra. In this study, the field experiment in 2002 growing season was conducted at the experimental farm of Zhejiang University, Hangzhou, China. Measurements of hyperspectral reflectance (350~2500 nm) and corresponding LAI were made for a paddy rice canopy throughout the growing season. And three methods were employed to identify the optimal wavebands for paddy rice LAI estimation: correlation coefficient-based method, vegetation index-based method, and stepwise regression method. This research selected 15 wavebands in the region of 350~2 500 nm, which appeared to be the optimal wavebands for the paddy rice LAI estimation. Of the selected wavebands, the most frequently occurring wavebands were centered around 554, 675, 723, and 1 633 nm. They were followed by 444, 524, 576, 594, 804, 849, 974, 1 074, 1 219, 1 510, and 2 194 nm. Most of them made physical sense and had their counterparts in spectral known feature positions, which indicates the promising potential of the 15 selected wavebands for the retrieval of paddy rice LAI.

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“…These samples were individually extracted in 10 ml of dimethyl sulfoxide solvent incubated at 55-60°C for 4-5 h or till tissue became colorless. The absorbance of the extracts was measured with a UV/visible spectrophotometer (Model Cary-50, Varian Inc., Palo Alto, California, USA) at 664, 648 and 470 nm, and the concentrations of Chl a, Chl b and carotenoids were calculated, respectively (Chappelle et al 1992). …”

Section: Pigments Contentmentioning

confidence: 99%

Temperature response of photosynthesis in different drug and fiber varieties of Cannabis sativa L.

Chandra

Lata

Khan

et al. 2011

Physiol Mol Biol Plants

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The temperature response on gas and water vapour exchange characteristics of three medicinal drug type (HP Mexican, MX and W1) and four industrial fiber type (Felinq 34, Kompolty, Zolo 11 and Zolo 15) varieties of Cannabis sativa, originally from different agro-climatic zones worldwide, were studied. Among the drug type varieties, optimum temperature for photosynthesis (T opt ) was observed in the range of 30-35°C in high potency Mexican HPM whereas, it was in the range of 25-30°C in W1. A comparatively lower value (25°C) for T opt was observed in MX. Among fiber type varieties, T opt was around 30°C in Zolo 11 and Zolo 15 whereas, it was near 25°C in Felinq 34 and Kompolty. Varieties having higher maximum photosynthesis (P N max ) had higher chlorophyll content as compared to those having lower P N max . Differences in water use efficiency (WUE) were also observed within and among the drug and fiber type plants. However, differences became less pronounced at higher temperatures. Both stomatal and mesophyll components seem to be responsible for the temperature dependence of photosynthesis (P N ) in this species, however, their magnitude varied with the variety. In general, a two fold increase in dark respiration with increase in temperature (from 20°C to 40°C) was observed in all the varieties. However, a greater increase was associated with the variety having higher rate of photosynthesis, indicating a strong association between photosynthetic and respiratory rates. The results provide a valuable indication regarding variations in temperature dependence of P N in different varieties of Cannabis sativa L.

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Ratio analysis of reflectance spectra (RARS): An algorithm for the remote estimation of the concentrations of chlorophyll A, chlorophyll B, and carotenoids in soybean leaves

Cited by 706 publications

References 13 publications

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Optimal waveband identification for estimation of leaf area index of paddy rice

Temperature response of photosynthesis in different drug and fiber varieties of Cannabis sativa L.

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