Development of a Screening Method for Drought Tolerance in Cotton Seedlings

Longenberger, P. S.; Smith, C. Wayne; Thaxton, P. M.; McMichael, B. L.

doi:10.2135/cropsci2006.01.0026

Cited by 34 publications

(27 citation statements)

References 25 publications

(27 reference statements)

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“…The phenotypic evaluation is an important resource in the hands of breeders because of their high throughput and cost economical nature. It has been identified earlier that seedling stage is the most sensitive stage of plant growth, and thus Where ±SD= Standard deviation, RL=Root length, SL=shoot length, RWC=Relative water content, ELWL=Excise Leaf Water Loss, SSI=Stress susceptibility index N=Normal water supply and D= Water deficit condition screening for stress tolerance at this stage has been targeted in various crops like wheat (Gesimba et al, 2004;Farshadfar et al, 2012), sorghum (Ali et al, 2011;Bibi et al, 2012) and cotton (Cook, 1989;Longenberger et al, 2006;Ahmad et al, 2009;Iqbal et al, 2011). Present studies were also based on the model used by these researchers.…”

Section: Discussionmentioning

confidence: 99%

“…Selection for morpho-physiological components of drought, at the seedling stage, is of great importance because tolerance, at this critical growth stage, contributes to high yield of seed cotton (Longenberger et al, 2006;Iqbal et al, 2010). It is particularly true when the breeding program is targeting the water stress tolerance (Khan et al, 2008;Jajarmi, 2009;Qayyum et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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

Hassan¹,

Azhar²,

Khan³

et al. 2015

IJAB

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, 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.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Hassan¹,

Azhar²,

Khan³

et al. 2015

IJAB

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“…The relatively more drought-resistant cultivars had the greatest values for all the four variables. A seedling drought-tolerance protocol was developed as a new method to select drought-tolerant individuals from various genotypes subjected to sequential drought cycles (Longenberger et al, 2006). Iqbal et al (2010) have studied shoot and root traits under normal water and water stress conditions, and they concluded that the existence of variability in cotton germplasm suggests that genetic improvement can be achieved through selection and breeding provided that the variability is affected by genetic components.…”

Section: Methodsmentioning

confidence: 99%

Genotypic variability for root/shoot parameters under water stress in some advanced lines of cotton (Gossypium hirsutum L.)

Riaz¹,

Farooq²,

Sakhawat³

et al. 2013

Genet. Mol. Res.

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ABSTRACT. Research pertaining to genetic variability parameters, heritability, and genotypic, phenotypic, simple, and environmental correlations for various seedling traits in five elite advanced cotton (Gossypium hirsutum L.) lines (FH-113, FH-114, FH-941, FH-942, and FH-2015) and one check (CIM-496) was carried out during October and November 2010 under greenhouse conditions at the Cotton Research Institute (Faisalabad, Pakistan). Material was raised in plastic tubes with a randomized complete block design replicated three times. Three drought shocks were applied by withholding water from the tube-sown plants for 8-, 10-, and 12-day intervals. After 60 days of sowing, data on root/shoot traits like root length (cm), shoot length (cm), root weight (g), shoot fresh weight (g), lateral root number, root dry weight (g) shoot dry weight (g), and total plant weight (g) were recorded. Considerable genotypic variations existed between genotypes for all seedling characters. Higher broad-sense heritability estimates were found for all traits studied. Maximum broad- Genotypic variability of Gossypium hirsutum sense heritability coupled with high genetic advance in root length (0.99, 17.34), lateral root number (0.91, 2.89), and shoot length (0.90, 4.35) suggested a potential for genetic improvement through breeding and selection. The correlation coefficients among root length, shoot length, root dry weight, fresh shoot weight, and total plant weight were positively and significantly correlated; thus, they can be selected simultaneously as drought tolerance selection indexes owing to the absence of undesired relationships. Genotypes FH-942 and FH-113 had the lowest excised leaf water loss during the first 4 h and also for the next 4 h. Therefore, these two advanced lines with high initial water content and lower excised leaf water loss had better adaptation to water stress.

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“…In addition, selection criteria should be easy, rapid and capable of evaluating plant performance at a critical developmental stage in both small and large populations. Selection of suitable Abbreviations: LRD, lateral root density; NLR, lateral root number; R%, recovery percent; RL, root length; R:S, root-to-shoot ratio; RW, root weight; SL, shoot length; SW, shoot weight; W 1 , optimum moisture level; W 2 , lowmoisture level; WRI, wilting rate index genotypes on the basis of seedling traits has been considered a reliable technique for evaluating a large number of genotypes for drought tolerance (Tomar and Kumar 2004;Basal et al 2005;Longenberger et al 2006).…”

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confidence: 99%

Effect of moisture regimes on combining ability variations of seedling traits in sunflower (Helianthus annuus L.)

Rauf¹,

Sadaqat²,

Khan³

2008

Can. J. Plant Sci.

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. 2008. Effect of moisture regimes on combining ability variations of seedling traits in sunflower (Helianthus annuus L.). Can. J. Plant Sci. 88: 323Á329. Seedlings traits provide a reliable and rapid technique for evaluating large numbers of genotypes for abiotic stresses. Experiments on sunflower were carried out under two moisture regimes in controlled conditions to study their modifying effect on phenotypic expression and combining ability of seedling traits such as root length (RL), shoot length (SL), root weight (RW), shoot weight (SW), root-to-shoot ratio (R:S), lateral root number (NLR), lateral root density (LRD), wilting rate index and recovery percent (R%), and their genotypic correlation with achene yield. Variation among breeding lines for relative decrease in the seedling traits under the moisture stress regime indicated their differences in moisture sensitivity. Genetic variation for all seedling traits was low over environments, but high within environments. Moisture regimes modified phenotype, ranking among parents, and combining ability of seedling traits. Relative contribution of specific combining ability to total variation decreased under the moisture stress regime for all root-based traits, with a corresponding increase in general combining ability due to either female, male or both. The moisture stress regime was favourable for the expression of additive genetic variability. All seedling traits except SL showed significant correlation with achene yield, which also signified their importance for improving achene yield under drought regimes. From the breeding point of view, R% and RW were more useful traits for evaluating genotypes for drought tolerance.Key words: Sunflower, seedling traits, genetic variability, drought tolerance Rauf, S., Sadaqat, H. A. et Khan, I. A. 2008. Incidence de l'humidite´sur la variation des aptitudes a`la combinaison des caracte`res de la plantule chez le tournesol (Helianthus annuus L.). Can. J. Plant Sci. 88: 323Á329. Les caracte`res de la plantule permettent d'e´valuer rapidement et de manie`re fiable un grand nombre de ge´notypes en fonction des stress abiotiques. Les auteurs ont proce´de´a`des expe´riences sur le tournesol en milieu controˆle´, sous deux re´gimes hygrome´triques, en vue de pre´ciser l'incidence de l'humidite´sur l'expression phe´notypique et la combinaison de divers caracte`res tels la longueur des racines, la longueur des pousses, le poids des racines, le poids des pousses, le ratio entre racines et pousses, le nombre de pousses late´rales, la densite´des pousses late´rales, l'indice de fle´trissement et de re´cupe´ration ainsi que leur corre´lation ge´notypique avec le rendement en ake`nes. La variation des ligne´es au niveau de l'affaiblissement relatif des caracte`res de la plantule conse´cutivement a`un stress hygrome´trique re´ve`le leur sensibilite´al 'humidite´. La variation ge´ne´tique des caracte`res de la plantule demeure faible d'un milieu a`l'autre, mais est e´leve´e au sein d'un meˆme environnement. Le re´gime hygrome´trique mo...

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Development of a Screening Method for Drought Tolerance in Cotton Seedlings

Cited by 34 publications

References 25 publications

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

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

Genotypic variability for root/shoot parameters under water stress in some advanced lines of cotton (Gossypium hirsutum L.)

Effect of moisture regimes on combining ability variations of seedling traits in sunflower (Helianthus annuus L.)

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