Application of non-destructive imaging techniques to evaluate cold tolerance in French marigold (Tagetes patula) genotypes

EDIGA  AMALA; KANWAR PAL  SINGH; SAPNA  PANWAR; NAMITA; SUDHIR  KUMAR; SANJAY K  SINGH; LOKENDRA  SINGH; MUDE RAMYA  SREE; PANCHAL  SANGMESH; PAVNESH KUMAR  VERMA

doi:10.56093/ijas.v95i9.156579

Authors

EDIGA AMALA ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
KANWAR PAL SINGH ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
SAPNA PANWAR ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
NAMITA ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
SUDHIR KUMAR ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
SANJAY K SINGH ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
LOKENDRA SINGH ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
MUDE RAMYA SREE ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
PANCHAL SANGMESH ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
PAVNESH KUMAR VERMA ICAR-Indian Agricultural Research Institute, New Delhi 110012, India

https://doi.org/10.56093/ijas.v95i9.156579

Keywords:

Cold tolerance, French marigold, High throughput phenotyping, Infrared imaging, Near-infrared, Red-Green-Blue spectra

Abstract

Climate change-induced erratic weather patterns necessitate the development of cold-tolerant marigold cultivars for sustainable floricultural production. The present study was carried out during winter (rabi) season 2021–22 and 2022–23 at ICAR-Indian Agricultural Research Institute, New Delhi to evaluate the efficacy of high-throughput, non-destructive image-based phenotyping techniques, including Red-Green-Blue (RGB), Near-Infrared (NIR), and Infrared (IR) imaging, for quantitative assessment of essential plant traits such as plant area, greenness, water content, and temperature. Ten French marigold (Tagetes patula L.) genotypes (Pusa Deep, Pusa Arpita, Dainty Marietta, Valencia Yellow, Orange Winner, Hisar Beauty, Hisar Jafri, Gulzafri Orange, Fr./W-20, Fr./W-21) were evaluated. The experiment was laid out in a complete randomized design (CRD) with two factors (genotype and environment) and three replications, with 18 plants/environment and 6 plants/replication. Technologies were applied to assess cold tolerance during the early reproductive phase of French marigold genotypes, grown under contrasting environments: Controlled conditions (polyhouse, 30.1°-33.7°C/3.4°-3.7°C) and cold stress (open field, 26.4°-28°C/0.8°-1.2°C) during winter season. Comparative analysis revealed that cold stress significantly impacted morpho-physiological parameters: Plant area decreased by 1.38-fold, caliper length by 1.07-fold, and compactness by 2.10-fold compared to the polyhouse environment. Convex hull area and circumference were reduced by 1.22-fold and 1.05-fold, respectively. Additionally, greenness and plant temperature decreased by approximately 1.03-fold, roundness by 2.07-fold, and plant water content by 1.44-fold. Statistical analysis revealed that open field conditions significantly decreased all measured morpho-physiological parameters, with plant compactness showing the greatest reduction compared to controlled conditions. Notably, genotypes including ‘Hisar Beauty’ and ‘Hisar Jafri ’ exhibited superior cold tolerance, demonstrating the least reductions in measured parameters under cold stress, while maintaining higher water content (NIR reflectance, 140.98%) and lower plant surface temperatures (19.06°C) compared to other genotypes. These findings underscore the potential of non-destructive image-based phenotyping as an efficient tool in screening for cold tolerance in marigold breeding programmes, offering a viable and precise alternative to traditional screening methods for accelerated cultivar development.

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