UAV multispectral phenotyping data of an M₂ sesame (Sesamum indicum L.) mutagenesis population under contrasting irrigation regimes (Larissa, Greece, 2025)

Plot-level multi-temporal UAV phenotyping data for 578 sesame genotypes (554 M₂ progeny rows from γ-irradiation of 23 elite parental lines + 24 unmutagenised parental controls) evaluated under two irrigation regimes (full irrigation, ~40 % reduced irrigation) at the Institute of Industrial and Forage Crops, ELGO-DIMITRA, Larissa, Greece, during the 2025 growing season. The dataset contains 4,312 plot × date × environment records covering four UAV phenotyping campaigns (11 July, 22 July, 6 August, 1 September 2025) at three flight altitudes (40, 80, 120 m AGL), four spectral reflectance indices (NDVI, NDRE, GNDVI, LCI) derived from 40 m AGL multispectral imagery (DJI Phantom 4 Multispectral), and ground-measured plant height. See README.md for the full data dictionary, acquisition protocol, and radiometric calibration chain.