Title:
Light Spectrum Effect on Stomatal Characteristics of Okra Leaves - Relationship Between NDVI and Leaf Area Index
Author(s):
Yao, Y.H., Degni, B.F., Canale, L., Dupuis, P., Haba, C.T., Zissis, G.
Document(s):
Paper
Poster
Abstract:
Light quality plays a crucial role in the physiological responses of plants, particularly in stomatal behavior and canopy development. This study investigated the effects of different light spectra blue (B, 445 nm), red (R, 660 nm), and an alternating red-blue cycle every three days (R3B3) on okra (Abelmoschus esculentus), compared to natural light conditions in greenhouse and outdoor environments. The results showed that both blue light and natural sunlight significantly increased stomatal length, width, and density. Blue light also promoted a higher Leaf Area Index (LAI) after 37 days of growth, while natural light treatments resulted in the overall highest LAI. A strong positive correlation (Rē = 0.85) was observed between the Normalized Difference Vegetation Index (NDVI), calculated from Infragram images, and LAI across all treatments. The red LED treatment exhibited the highest predictability (Rē = 0.95), confirming that NDVI is a reliable, non-destructive indicator for monitoring leaf development in okra. These findings highlight the potential of blue LED lighting to enhance stomatal morphology and leaf surface development, and support the integration of low-cost NDVI imaging into precision agriculture practices for okra production.
Keywords:
NDVI, light spectrum, okra leaf, stomata, LAI
Topic:
Sustainable Resources for Decarbonising the Economy
Subtopic:
Sustainable integrated agricultural management practices
Event:
33rd European Biomass Conference and Exhibition
Session:
1DV.5.9
Pages:
224 - 230
ISBN:
978-88-89407-25-7
Paper DOI:
10.5071/33rdEUBCE2025-1DV.5.9
Price:
FREE
