Evaluation of Some Indirect Traits and Indices to Identify Drought Tolerance in Bread Wheat (Triticum aestivum L.)

Zarei, Leila; Farshadfar, Ezatollah; Haghparast, Reza; Rajabi, Rahman; Badieh, Marjan Mohammadi Sarab

doi:10.3923/ajps.2007.1204.1210

Cited by 23 publications

(9 citation statements)

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“…Crops with improved tolerance level to drought stress appear to be crucial in areas where dry seasons are common (Andrew et al, 2000). Drought tolerance is not a unique and easily quantifiable plant attribute; it is a complex character that can be evaluated with relative water content (RWC), relative water loss, chlorophyll fluorescence, stomatal resistance, cell membrane stability, free prolin accumulation and many other characters (Zarei et al, 2007). Among the traits used for evaluating plant waterstatus, RWC gives best measure of the level of the water deficit in the plant at a specific time-point.…”

Section: Introductionmentioning

confidence: 99%

Identification of quantitative trait loci for relative water content and chlorophyll concentration traits in recombinant inbred lines of sunflower (Helianthus annuus L.) under well-watered and water-stressed conditions

Abdi

Darvishzadeh

Maleki

et al. 2013

Zemdirbyste-Agriculture

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The goal of the present research work was to identify quantitative trait loci (QTLs) involved in the genetic variation of relative water content and chlorophyll concentration in sunflower (Helianthus annuus L.) under well-watered and water-stressed conditions. 70 recombinant inbred lines (RILs) out of 123 from the cross PAC2 × RHA266 and their parental lines were evaluated in a rectangular 8 × 9 lattice design with two replications under well-watered and water-stressed conditions. High genetic variability and transgressive segregation was observed among RILs for evaluated traits in both water treatment conditions. QTLs were mapped using an updated high-density simple sequence repeat (SSR) and single nucleotide polymorphism (SNP) linkage map. The map consisted of 210 SSR and 11 genes placed in 17 linkage groups. The total map length is 1,653.1 cM (centimorgan) with a mean density of 1 marker per 7.44 cM. Under well-watered state, 3 and 6 QTLs were identified for chlorophyll concentration and relative water content, respectively. In water-stressed condition 7 and 2 QTLs were identified. The percentage of phenotypic variance (R 2 ) explained by QTLs ranged from 0.39% to 52.48%. QTLs for chlorophyll concentration and relative water content on linkage group 10 and 16 were overlapped. Common QTLs for different traits in both water treatment conditions on linkage groups 10 seem to be more important as it gives a constitutive performance for the traits without being affected by water treatment.

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Section: Introductionmentioning

confidence: 99%

Identification of quantitative trait loci for relative water content and chlorophyll concentration traits in recombinant inbred lines of sunflower (Helianthus annuus L.) under well-watered and water-stressed conditions

Abdi

Darvishzadeh

Maleki

et al. 2013

Zemdirbyste-Agriculture

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“…PI and GSI indicate the drought‐tolerance and increase in these indices supporting the concept that bacterial inoculation helped wheat seeds to withstand and germinate under stress. In wheat and triticale, seeds with higher GSI and PI show higher drought tolerance (Mohammadi et al, 2003; Zarei et al, 2007) as both indices are quantitative measurements to characterize drought tolerance (Razzaq et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Seed inoculation of desert‐plant growth‐promoting rhizobacteria induce biochemical alterations and develop resistance against water stress in wheat

Zia

Nawaz

Yousaf

et al. 2021

Physiologia Plantarum

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Water shortage limits agricultural productivity, so strategies to get higher yields in dry agricultural systems is vital to circumvent the effect of climate change and landshortage. The plant rhizosphere harbors beneficial bacteria able to confer biotic/abiotic tolerance along with a positive impact on plant growth. Herein, three bacterial strains, Proteus mirabilis R2, Pseudomonas balearica RF-2 and Cronobacter sakazakii RF-4 (accessions: LS975374, LS975373, LS975370, respectively) isolated from native desertweeds were investigated for their response to improve wheat growth under drought stress. The bacteria showed drought tolerance up to 20% polyethylene glycol (PEG; −0.6 MPa), and salt (65-97 g l −1 ), 1-aminocyclopropane-1-carboxylate (ACC)-deaminase activity, P/Zn/K-solubilization, calcite degradation, IAA, and siderophore production. The plant growth-promoting rhizobacteria (PGPR) were evaluated on wheat under water stress. The P. balearica strain RF-2 primed seeds showed a maximum promptness index and germination index under PEG-stress, that is, 68% and 100%, respectively. Inoculation significantly improved plant growth, leaf area, and biomass under water stress. P. mirabilis R2 inoculated plant leaves showed the highest water contents as compared to the plants inoculated with other strains. C. sakazakii RF-4 inoculated plants showed minimum cell injury, electrolyte leakage, and maximum cell membrane stability at PEG stress. After 13 days exposure to drought, C. sakazakii RF-4 treated plants showed an overall higher expression of cytosolic ascorbate peroxidase (cAPX) and ribulose-bisphosphate carboxylase (rbcL) genes. The activity of stressinduced catalase and polyphenol oxidase was reduced, while that of peroxidase and superoxide dismutase increased after inoculation but the response was temporal.Taken together, this data explains that different PGPR (especially C. sakazakii RF-4) modulate differential responses in wheat that eventually leads towards drought tolerance, hence, it has the potential to enhance crop production in arid regions. | INTRODUCTIONThe last few decades have shown alarming evidence of climate change (Fischer & Knutti, 2015) on the entire planet. The world population is projected to hit 9.8 billion by 2050 (UN World Population Rabisa Zia and Muhammad Shoib Nawaz contributed equally to this study.

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“…Crop drought tolerance is a complex and not easily quantifiable plant trait (Zarei et al, 2007). Compared with other traits, such as chlorophyll fluorescence, relative water loss, free proline accumulation, cell membrane stability, and many other characteristics used for evaluating the plant water status, the LRWC is more appropriate for determining the plant water deficit level at a specific time-point.…”

Section: Lrwc Is An Important Indicator Of Plant Water Deficit Tolerancementioning

confidence: 99%

Bulk analysis by resequencing and RNA‐seq identifies candidate genes for maintaining leaf water content under water deficit in maize

Zhang

et al. 2021

Physiologia Plantarum

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Drought is one of the main abiotic stresses adversely affecting maize growth and grain yield. Identifying drought tolerance-related genes and breeding varieties with enhanced tolerance are effective strategies for minimizing the effects of drought stress. In this study, the leaf relative water content (LRWC) was used for evaluating drought tolerance. QTL-seq analysis of 419 F 2 individuals from a cross between ZhengT22 (the drought-tolerant line with high LRWC) and ZhengA88 (the drought-sensitive line with low LRWC) revealed four LRWC-related QTLs (qLRWC2, qLRWC10a, qLRWC10b, and qLRWC10c) in maize seedlings under water deficit. Of these QTLs, qLRWC2 was located in a 2.03-Mb interval on chromosome 2, whereas qLRWC10a, qLRWC10b, and qLRWC10c were located in 2.85-, 3.99-, and 2.05-Mb intervals, respectively, on chromosome 10, and the 93 genes contained the variation loci locating in the four QTLs regions. To identify the candidate genes within the QTLs, an RNA-seq analysis was performed for the parents exposed to water deficit. Seven genes with effective variation loci showed significant difference in expression either in ZhengA88 or ZhengT22 in response to water deficit. Moreover, among the genes, ZmPrx64, ZmCIPK, HSP90, and ABCG34 have all been shown to be related to water stress in the previous studies. Thus, they are primary considered as the potential candidate genes controlling LRWC under water deficit at the seeding stage of maize in this study. These findings will help clarify the molecular basis of drought tolerance in maize seedlings and may be relevant for future functional analysis and for breeding drought-tolerant maize varieties. | INTRODUCTIONDrought is a main abiotic constraint to crop growth and grain yield, accounting for approximately 70% potential yield loss for major crops worldwide (Ghatak et al., 2017;Wu et al., 2017). According to meteorologists estimation, the rates of grain yield reduction due to drought stress for the major crops will obviously increase and is expected to be nearly 90% in 2100 (Li et al., 2009). Hence, enhancing crop tolerance to drought is critical for sustainable production (Khan et al., 2020).Maize (Zea mays L.) is one of the most widely cultivated crops, offering feed for animals, food for humans, materials for industry, Fengqi Zhang and Jun Zhang contributed equally to this work.

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Evaluation of Some Indirect Traits and Indices to Identify Drought Tolerance in Bread Wheat (Triticum aestivum L.)

Cited by 23 publications

References 1 publication

Identification of quantitative trait loci for relative water content and chlorophyll concentration traits in recombinant inbred lines of sunflower (Helianthus annuus L.) under well-watered and water-stressed conditions

Identification of quantitative trait loci for relative water content and chlorophyll concentration traits in recombinant inbred lines of sunflower (Helianthus annuus L.) under well-watered and water-stressed conditions

Seed inoculation of desert‐plant growth‐promoting rhizobacteria induce biochemical alterations and develop resistance against water stress in wheat

Bulk analysis by resequencing and RNA‐seq identifies candidate genes for maintaining leaf water content under water deficit in maize

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