Salinity is a major abiotic stress factor that significantly hampers agricultural productivity worldwide, particularly in arid and semi-arid regions. Okra (Abelmoschus esculentus L.), a widely cultivated vegetable crop, is moderately sensitive to salt stress, which adversely affects its growth, yield, and quality. A research gap found in previous studies is the limited evaluation of genotype-specific responses to varying salinity levels on okra growth and yield. A pot experiment was conducted to assess the effects of different salt stress levels on the development and yield of three okra varieties, including Super Shomy (V1), BARI Dherosh-2 (V2), and Green Finger (V3). Thirty-days-old seedlings were exposed to the following salinity treatments: T0 (control), T1 (100 mM NaCl), T2 (70 mM NaCl), and T3 (40 mM NaCl). The results revealed significant variations in growth and yield among salt treatments and varieties. The highest plant height (68.59 cm), leaf number plant− 1 (8.92), leaf length (9.98 cm), leaf width (12.90 cm), leaf area (128.66 cm² plant− 1), branches plant− 1 (2.13), early flowering (21.49 DAS), early fruiting (24.88 DAS), number of fruits plant− 1 (13), individual fruits weight (14.35 g) and yield plant− 1 (187.51 g) were recorded in the control (T0) with Super Shomy (V1). Conversely, the lowest values for these parameters were obtained from the T1 treatment with BARI Dherosh-2 (V2). Under high salt stress (T1), V1 (Super Shomy) exhibited comparatively superior performance compared to V2 and V3, maintaining plant height (50.40 cm), leaf number plant− 1(7.47), leaf area (91 cm² plant− 1), branch number plant− 1 (1.93), early flowering (32.49 DAS), early fruiting (37.54 DAS), fruits plant− 1 (5.33), individual fruits weight (8.35 g) and yield plant− 1 (43.96 g). The results of the study demonstrate that increasing salinity levels negatively impact growth and yield, with the most severe effects were observed at 100 mM NaCl (T1). Among the genotypes, Super Shomy (V1) displayed the highest salt tolerance, making it a promising candidate for cultivation in saline environments. Future studies should investigate the physiological and molecular mechanisms of salt tolerance in these okra genotypes to improve their adaptation in saline conditions and enhance genetic improvement of salt-tolerant okra.

Evaluation of okra genotypes under varied salt stress conditions

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2026年4月16日

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Abdullah Al Kafi,
Md. Ashaduzzaman Siddikee,
Shaila Sharmin,
Md. Nazmul Hasan Arfin,
Dipeeka Roy,
Maxim Chakma,
Probir Kumar Mittra,
M. Abdul Karim,
Md Abdul Halim,
Swapan Kumar Roy

摘要

Salinity is a major abiotic stress factor that significantly hampers agricultural productivity worldwide, particularly in arid and semi-arid regions. Okra (Abelmoschus esculentus L.), a widely cultivated vegetable crop, is moderately sensitive to salt stress, which adversely affects its growth, yield, and quality. A research gap found in previous studies is the limited evaluation of genotype-specific responses to varying salinity levels on okra growth and yield. A pot experiment was conducted to assess the effects of different salt stress levels on the development and yield of three okra varieties, including Super Shomy (V₁), BARI Dherosh-2 (V₂), and Green Finger (V₃). Thirty-days-old seedlings were exposed to the following salinity treatments: T₀ (control), T₁ (100 mM NaCl), T₂ (70 mM NaCl), and T₃ (40 mM NaCl). The results revealed significant variations in growth and yield among salt treatments and varieties. The highest plant height (68.59 cm), leaf number plant^− 1 (8.92), leaf length (9.98 cm), leaf width (12.90 cm), leaf area (128.66 cm² plant^− 1), branches plant^− 1 (2.13), early flowering (21.49 DAS), early fruiting (24.88 DAS), number of fruits plant^− 1 (13), individual fruits weight (14.35 g) and yield plant^− 1 (187.51 g) were recorded in the control (T₀) with Super Shomy (V₁). Conversely, the lowest values for these parameters were obtained from the T₁ treatment with BARI Dherosh-2 (V₂). Under high salt stress (T₁), V₁ (Super Shomy) exhibited comparatively superior performance compared to V₂ and V₃, maintaining plant height (50.40 cm), leaf number plant^− 1(7.47), leaf area (91 cm² plant^− 1), branch number plant^− 1 (1.93), early flowering (32.49 DAS), early fruiting (37.54 DAS), fruits plant^− 1 (5.33), individual fruits weight (8.35 g) and yield plant^− 1 (43.96 g). The results of the study demonstrate that increasing salinity levels negatively impact growth and yield, with the most severe effects were observed at 100 mM NaCl (T₁). Among the genotypes, Super Shomy (V₁) displayed the highest salt tolerance, making it a promising candidate for cultivation in saline environments. Future studies should investigate the physiological and molecular mechanisms of salt tolerance in these okra genotypes to improve their adaptation in saline conditions and enhance genetic improvement of salt-tolerant okra.