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Open AccessArticle

Assessment of Photosynthetic Pigment and Water Contents in Intact Sunflower Plants from Spectral Indices

Agrarian Sciences Department, Campus Sete Lagoas, Federal University of São João del-Rei, Rodovia MG 424, km 47, Sete Lagoas, 35701-970 Minas Gerais, Brazil
Author to whom correspondence should be addressed.
Academic Editor: Mohammad Valipour
Agriculture 2017, 7(2), 8;
Received: 13 December 2016 / Accepted: 2 February 2017 / Published: 6 February 2017
(This article belongs to the Special Issue Innovative Approaches to Agricultural Water Management)
Under water-limited conditions, monitoring water and chlorophyll status is essential to avoid restrictions in crop growth and yield. This study was carried out to assess water and chlorophyll contents from spectral indices in sunflower plants. The hybrid Sunbright Supreme was cultivated inside a non-acclimatized greenhouse until the start of the flowering stage, and later was maintained in a growth chamber with the purpose of submitting the plants to a slow and progressive dehydration rate for 12 consecutive days. Spectral (reflectance and transmittance), leaf masses (fresh and dry), and total chlorophyll measurements were accomplished in sunflower plants. The water stress caused a reduction in the water and chlorophyll contents, resulting in linear and nonlinear decreases for the spectral indicators Water Index (WI) and Chlorophyll Content Index (CCI), respectively. The low scattering of the average values around the fitted models indicates that WI and CCI were effective in representing changes in water and chlorophyll status for sunflowers (R2 = 0.912 and R2 = 0.905). The benefits of using hand-held optical meters for reflectance and transmittance are that they enable rapid, accurate, and nondestructive assessments of water and chlorophyll contents in sunflower plants from radiometric indicators. View Full-Text
Keywords: Helianthus annuus L.; reflectance; transmittance; chlorophyll; water stress Helianthus annuus L.; reflectance; transmittance; chlorophyll; water stress
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Steidle Neto, A.J.; Lopes, D.D.C.; Borges Júnior, J.C.F. Assessment of Photosynthetic Pigment and Water Contents in Intact Sunflower Plants from Spectral Indices. Agriculture 2017, 7, 8.

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