Characterization of Cotton (Gossypium hirsutum) Germplasm for Drought Tolerance using Seedling Traits and Molecular Markers

Abstract

, 2015. Characterization of cotton (Gossypium hirsutum) germplasm for drought tolerance using seedling traits and molecular markers. AbstractDrought tolerance is the major area of thrust nowadays, due to the water scarcity and climate change scenario, around the globe. Looking for the novel cotton germplasm tolerant to drought is an import ant breeding objective of the major breeding programs. On the basis of these grounds, 42 cotton varieties were evaluated for their genetic potential to perform under limited water conditions (60% field capacity). The germplasm was subjected to the seedling stage drought stress, to observe genetic variation within germplasm for various traits related with drought stress viz. shoot length (cm), root length (cm), excise leaf water loss (ELWL) and relative water contents (RWC). These traits were used as stress indicators and significant variation was observed for these estimates. Among the seven tolerant accessions, DPL-26 and 149F were identified as the highly tolerant due to their least SSI estimates for most of the characters studied. Likewise among the susceptible lines, FH-1000 and NF-801 were identified as highly susceptible. Our studies showed the presence of genetic variability for the trait of interest and it exhibits its potential for exploitation in the future breeding for drought tolerance.

Dissection of Drought Tolerance in Upland Cotton Through Morpho-Physiological and Biochemical Traits at Seedling Stage

“…seedlings were watered accordingly. The experiment continued until the fourth main stem leaf, and at this stage, young plants were uprooted for the measurement of morpho-physiological parameters (Hassan et al, 2015).…”

“…The readings were taken from the third leaf of every replicate of a particular genotype (Singh et al, 2018). RWC and leaf water loss are the physiological parameters as described by Hassan et al (2015).…”

Screening for drought tolerance in cotton (Gossypium hirsutum L.) using in vitro technique

“…Water stress sensitive genotypes show more reduction in root growth, whereas drought stress tolerant genotypes appeared to be relatively less affected under moisture stress condition in cotton. The longer root length of tolerant varieties might be due to higher osmotic adjustment and retention of more water content in cotton plant (Hassan et al, 2015).…”

“…These interactions revealed LINE 17, LINE 30, SAMCOT 9 and CL-07 recorded higher root fresh weight, CL-07 recorded longest root length, while SAMCOT 8 recorded higher number of root compared to the other lines under 15 g/L PEG. Among the drought related morphological traits, root length has been reported to be one of the most important trait for drought tolerance and thus, may be used to measure the level of tolerance of cotton varieties at seedling phase (Basal et al, 2005;Hassan et al, 2015). Amandeep and Rashpal (2020) also reported interactions for root fresh weight and root length in wheat.…”

Breeding Potential of Upland Cotton for Water Stress Tolerance

“…Reduction in number of bolls were observed under water stress (Pettigrew 2004). Genetic basis of drought tolerance in cotton has been elaborated by several researchers (Javaid et al, 2014;Hassan et al, 2015). Additive and non-additive type of gene action were involved in the inheritance of various plant characters involved in water stress tolerance.…”