Genotypic Varıabılıty and Assocıatıon between Seed Traıts and Seedlıng Vıgor in Upland Cotton
Genotypic Varıabılıty and Assocıatıon between Seed Traıts and Seedlıng Vıgor in Upland Cotton
Muhammad Iqbal1, Sami Ul-Allah2*, Muhammad Naeem1, Muhammad Ijaz2 and Muhammad Qadir Ahmad3
ABSTRACT
Physical attributes of seed play a prime role in seedling establishment. Present study was conducted to investigate genotypic variability and correlations among upland cotton (Gossypium hirsutum) cultivars for some physical (seed weight, seed surface area and seed density) and biochemical (seed oil contents) seed traits. The study determined the effects of water stress on genetic variability of root and shoot traits and association of the seed traits with seedling vigor. 15 cotton cultivars were studied at two levels of irrigation during 2014-15. Results showed highly significant (p≤0.05) genotypic differences for seed and root‒shoot traits. Reduction in fresh weight of different cultivars due to water stress ranged 14.74 to 29.81% and reduction in dry weight due to water stress range 12.52 to 43.30%. Whereas increase in root-shoot ratio was observed due to water stress and it ranged from 11.19 to 54.05% for different genotypes. Cultivar into irrigation interaction was significant and genotypic variability declined under water stress conditions relative to irrigated conditions. Fresh and dry shoot weights were positively correlated with all seed traits. The highest correlation (0.94) was observed between seed weight and fresh shoot weight under irrigated condition followed by correlation of dry shoot weight with seed weight (0.89) under irrigated conditions. Correlation of all the studied traits decreased under water stress conditions. Correlation of root-shoot ratio with seed weight (0.19), seed surface area (0.49) and seed density (0.17) was positive under irrigated conditions but changes to negative (-0.41, -0.28, -0.39 respectively) under water stress conditions. A highly significant correlation between seed physical traits and seedling vigor showed possibility of quick selection for plant breeders on the basis of seed traits.
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