Performance of finger millet genotypes under terminal heat stress as influenced by plant growth regulators

Résumé fourni par la source

Terminal heat stress is an important constraint to finger millet productivity, particularly during reproductive and grain-filling stages. The present study was conducted to evaluate the response of diverse finger millet genotypes to terminal heat stress and to assess the effectiveness of plant growth regulators (PGRs) in improving growth and yield performance. Fifteen finger millet genotypes were evaluated under terminal heat stress with salicylic acid (SA) @ 100 mg L⁻¹, gibberellic acid (GA₃) @ 100 mg L⁻¹ and an untreated control. Pooled analysis revealed significant genotypic variation for plant stand establishment, plant height, seed yield, biological yield and harvest index. G7 (SKMFM3014) recorded the maximum plant stand establishment (24.37 plants m⁻²), followed by G5 (KMR708) (23.68 plants m⁻²), whereas G13 (WWN35) recorded the minimum (17.95 plants m⁻²). G1 (IIMRFM3996) recorded the maximum plant height at harvest (92.09 cm), while G7 (SKMFM3014) recorded the minimum (72.43 cm). The highest seed yield was recorded in G10 (CFMV-1) (5306.89 kg ha⁻¹), which was at par with G1 (IIMRFM3996) (5208.88 kg ha⁻¹), whereas G7 recorded the lowest seed yield (4131.72 kg ha⁻¹). G1 recorded the maximum biological yield (16177.99 kg ha⁻¹), while G7 recorded the minimum (12359.02 kg ha⁻¹). G3 (WN1585) recorded the highest harvest index (33.68%), followed by G8 (VL376) (32.65%) and G7 (SKMFM3014) (32.27%). Among PGR treatments, GA₃ @ 100 mg L⁻¹ recorded the maximum plant height (86.64 cm), seed yield (5117.71 kg ha⁻¹), biological yield (15874.31 kg ha⁻¹) and harvest index (36.91%), followed by SA @ 100 mg L⁻¹ with seed yield of 4780.80 kg ha⁻¹, biological yield of 14781.40 kg ha⁻¹ and harvest index of 32.56%. The untreated control recorded the minimum seed yield (4303.54 kg ha⁻¹), biological yield (13382.10 kg ha⁻¹) and harvest index (26.45%). Overall, G10 (CFMV-1) and G1 (IIMRFM3996) demonstrated superior productivity under terminal heat stress, while GA₃ @ 100 mg L⁻¹ was the most effective PGR for improving growth, biomass production, grain yield and harvest efficiency.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.