Genotypic differences in leaf secondary metabolism, plant hormones and yield under alone and combined stress of drought and salinity in cotton genotypes

Ibrahim, Wasim; Zhu, Ya-Ming; Chen, Yu; Qiu, Cheng‐Wei; Zhu, Shuijin; Wu, Feibo

doi:10.1111/ppl.12862

Cited by 90 publications

(43 citation statements)

References 61 publications

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“…GWAS analyses of BNPP are relatively rare, especially under salt stress. Our studies showed that salt stress can lead to a significant decrease in boll number per plant, which was consistent with previous reports [40,50], indicating that boll number is the first limiting factor for increasing cotton lint yield under stress environments. We also found that the number of repeated QTLs associated with BNPP was low under different salt conditions, implying a complex regulatory mechanism for BNPP.…”

Section: Discussionsupporting

confidence: 93%

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Genome-wide association reveals genetic variation of lint yield components under salty field conditions in cotton (Gossypium hirsutum L.)

et al. 2020

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Background: Salinity is one of the most significant environmental factors limiting the productivity of cotton. However, the key genetic components responsible for the reduction in cotton yield in saline-alkali soils are still unclear. Results: Here, we evaluated three main components of lint yield, single boll weight (SBW), lint percentage (LP) and boll number per plant (BNPP), across 316 G. hirsutum accessions under four salt conditions over two years. Phenotypic analysis indicated that LP was unchanged under different salt conditions, however BNPP decreased significantly and SBW increased slightly under high salt conditions. Based on 57,413 high-quality single nucleotide polymorphisms (SNPs) and genome-wide association study (GWAS) analysis, a total of 42, 91 and 25 stable quantitative trait loci (QTLs) were identified for SBW, LP and BNPP, respectively. Phenotypic and QTL analysis suggested that there was little correlation among the three traits. For LP, 8 stable QTLs were detected simultaneously in four different salt conditions, while fewer repeated QTLs for SBW or BNPP were identified. Gene Ontology (GO) analysis indicated that their regulatory mechanisms were also quite different. Via transcriptome profile data, we detected that 10 genes from the 8 stable LP QTLs were predominantly expressed during fiber development. Further, haplotype analyses found that a MYB gene (GhMYB103), with the two SNP variations in cis-regulatory and coding regions, was significantly correlated with lint percentage, implying a crucial role in lint yield. We also identified that 40 candidate genes from BNPP QTLs were salt-inducible. Genes related to carbohydrate metabolism and cell structure maintenance were rich in plants grown in high salt conditions, while genes related to ion transport were active in plants grown in low salt conditions, implying different regulatory mechanisms for BNPP at high and low salt conditions. Conclusions: This study provides a foundation for elucidating cotton salt tolerance mechanisms and contributes gene resources for developing upland cotton varieties with high yields and salt stress tolerance.

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Section: Discussionsupporting

confidence: 93%

“…Cotton yield decreases under salt stress. Previous studies have reported that SBW, LP and BNPP are remarkably decreased under salt stress conditions [40][41][42]. In the present study, we selected four different field soil salt environments with two year replicates to investigate the lint yield components of cotton accessions.…”

Section: Discussionmentioning

confidence: 99%

Genome-wide association reveals genetic variation of lint yield components under salty field conditions in cotton (Gossypium hirsutum L.)

et al. 2020

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“…GWAS analysis on BNPP are relatively rare, especially under salt stress. Our studies showed that salt stress can lead to a significant decrease in boll number per plant which was consistent with previous reports [46,52], indicating that boll number is the first limiting factor for increasing cotton lint yield under stress environments. We also found the overlapped QTLs associated with BNPP was few under different salt conditions, implying a complex regulatory mechanism for BNPP production.…”

Section: Discussionsupporting

confidence: 93%

“…Excavating elite alleles that can Cotton yield decreases under salt stress. The previous studies reported that SBW, LP and BNPP remarkably decreased under salt stress [46][47][48]. In present study, we selected four different field soil salt environments with two year replicates to investigate the lint yield components of cotton accessions.…”

Section: Discussionmentioning

confidence: 97%

Genome-wide association study reveals genetic variation and candidate genes of lint yield components under salt field conditions in cotton (Gossypium hirsutum L.)

Zhu¹,

Gao²,

Song³

et al. 2019

Preprint

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Background Salinity is one of the most decisive environmental factors limiting the productivity of cotton. However, the key genetic components leading to the reduction of cotton yield in saline-alkali soils are still unclear. Results Here, we evaluated three main components of lint yield across 316 G. hirsutum accessions, including single boll weight (SBW), lint percentage (LP) and boll number per plant (BNPP), under four salt conditions for two years. Phenotypic analysis indicated that LP showed no change under different salt conditions, however BNPP decreased significantly while SBW increased slightly under high salt condition. Based on 57,413 high-quality single nucleotide polymorphisms (SNPs) and genome-wide association studies (GWAS) analysis, a total of 42, 91 and 25 stable quantitative trait loci (QTLs) were identified for SBW, LP and BNPP, respectively. Few overlapped QTLs and no significant phenotypic correlation among the three traits was observed. Gene Ontology (GO) analysis indicated that their regulatory mechanisms were also quite different. There were 8 overlapped QTLs for LP while fewer for SBW and BNPP identified by comparing different salt conditions. We detected that 10 genes from the 8 stable LP QTLs were predominantly expressed during fiber development. Further, haplotype analyses found that a MYB gene ( GhMYB103 ) with the two SNP variations in cis-regulatory and coding regions, was significantly correlated with lint percentage, implying the crucial role in lint yield. With transcriptome analysis, we identified that 40 candidate genes from BNPP QTLs were salt-inducible. However, these genes exhibited different regulation pattern. Genes related to carbohydrate metabolism and cell structure maintenance were rich in high salt condition, while genes related to ion transport were active in low salt condition. Conclusions This study provides a foundation for elucidating cotton salt tolerance mechanism and contributes gene resources for developing varieties with high yield and salt stress tolerance in upland cotton.

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“…Salt stress causes cellular water loss and produces ROS, which disrupt biochemical reactions [48, 49]. Chitinase is generally a useful target related to plant reactions against salt stress, and its increased expression level confers a higher salt resistance to plants [50, 51]. Similarly, increased expression of phospholipase D1 decreases osmotic stress [52].…”

Section: Discussionmentioning

confidence: 99%

Heterogeneous root zone salinity mitigates salt injury to Sorghum bicolor (L.) Moench in a split-root system

Zhang

Wang

et al. 2019

PLoS ONE

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The heterogeneous distribution of soil salinity across the rhizosphere can moderate salt injury and improve sorghum growth. However, the essential molecular mechanisms used by sorghum to adapt to such environmental conditions remain uncharacterized. The present study evaluated physiological parameters such as the photosynthetic rate, antioxidative enzyme activities, leaf Na+ and K+ contents, and osmolyte contents and investigated gene expression patterns via RNA sequencing (RNA-seq) analysis under various conditions of nonuniformly distributed salt. Totals of 5691 and 2047 differentially expressed genes (DEGs) in the leaves and roots, respectively, were identified by RNA-seq under nonuniform (NaCl-free and 200 mmol·L-1 NaCl) and uniform (100 mmol·L-1 and 100 mmol·L-1 NaCl) salinity conditions. The expression of genes related to photosynthesis, Na+ compartmentalization, phytohormone metabolism, antioxidative enzymes, and transcription factors (TFs) was enhanced in leaves under nonuniform salinity stress compared with uniform salinity stress. Similarly, the expression of the majority of aquaporins and essential mineral transporters was upregulated in the NaCl-free root side in the nonuniform salinity treatment, whereas abscisic acid (ABA)-related and salt stress-responsive TF transcripts were more abundant in the high-saline root side in the nonuniform salinity treatment. In contrast, the expression of the DEGs identified in the nonuniform salinity treatment remained virtually unaffected and was even downregulated in the uniform salinity treatment. The transcriptome findings might be supportive of the increased photosynthetic rate, reduced Na+ levels, increased antioxidative capability in the leaves and, consequently, the growth recovery of sorghum under nonuniform salinity stress as well as the inhibited sorghum growth under uniform salinity conditions. The increased expression of salt resistance genes activated in response to the nonuniform salinity distribution implied that the cross-talk between the nonsaline and high-saline sides of the roots exposed to nonuniform salt stress is potentially regulated.

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Genotypic differences in leaf secondary metabolism, plant hormones and yield under alone and combined stress of drought and salinity in cotton genotypes

Cited by 90 publications

References 61 publications

Genome-wide association reveals genetic variation of lint yield components under salty field conditions in cotton (Gossypium hirsutum L.)

Genome-wide association reveals genetic variation of lint yield components under salty field conditions in cotton (Gossypium hirsutum L.)

Genome-wide association study reveals genetic variation and candidate genes of lint yield components under salt field conditions in cotton (Gossypium hirsutum L.)

Heterogeneous root zone salinity mitigates salt injury to Sorghum bicolor (L.) Moench in a split-root system

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