Assessment of genetic architecture of cotton germplasm for drought tolerance: A focus on morpho-physiological and biochemical attributes
Cotton (Gossypium hirsutum) is a vital fiber and cash crop, but water scarcity significantly impacts its development and production. The drought tolerance of 15 genotypes was evaluated at the seedling stage under three water regimes: control, 40%, and 20% field capacity. Significant variations in s...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AcademicPres
2025-06-01
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| Series: | Notulae Botanicae Horti Agrobotanici Cluj-Napoca |
| Subjects: | |
| Online Access: | https://www.notulaebotanicae.ro/index.php/nbha/article/view/14205 |
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| Summary: | Cotton (Gossypium hirsutum) is a vital fiber and cash crop, but water scarcity significantly impacts its development and production. The drought tolerance of 15 genotypes was evaluated at the seedling stage under three water regimes: control, 40%, and 20% field capacity. Significant variations in sodium ions (Na+) were observed across all morphological and physiological traits. Key traits like fresh root weight, shoot length, total chlorophyll, hydrogen peroxide (H2O2), K+/Na+, and potassium ions (K+) showed strong interactions between drought stress and genotype (D × G). Excised leaf water loss (ELWL) was positively correlated with shoot length (SL) under both control and drought conditions, while negatively associated with fresh root weight. Shoot length had a positive correlation with all attributes except Na+. Fresh root weight was negatively correlated with H2O2 but positively with other traits. Potassium ions were positively associated with SL, fresh root weight, and chlorophyll content. Genotypic correlations showed positive relationships for all biochemical traits except H2O2. Traits like root length, shoot length, ELWL, relative water content, proline, peroxidase (POD), H2O2, and K+/Na+ can differentiate drought-tolerant genotypes. Genotypes RH-622, FH-144, CIM-608, and MNH-886 showed potential for developing drought-resistant cotton cultivars.
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| ISSN: | 0255-965X 1842-4309 |