Responses to Oxygen Deprivation and Potential for Enhanced Flooding Tolerance in Maize

Subbaiah, Chalivendra C.; Sachs, Martin M.

doi:10.1007/978-0-387-79418-1_17

Cited by 4 publications

(4 citation statements)

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“…Longterm plant survival requires continuation of protein synthesis even under anoxic conditions. 37,38 It is possible that Hb Fe(II) NO is an intermediate in the production of a further reduced nitrogen oxide, which could lead to the ammonia needed for protein synthesis in the absence of O 2 .…”

Section: ' Resultsmentioning

confidence: 99%

“…However, Hb Fe(II) NO formed in the reaction would inhibit catalytic nitrite reduction, and there would need to be either a mechanism in vivo for its removal prior to Hb binding, or Hb Fe(II) NO must react further to regenerate free Hb. Long-term plant survival requires continuation of protein synthesis even under anoxic conditions. , It is possible that Hb Fe(II) NO is an intermediate in the production of a further reduced nitrogen oxide, which could lead to the ammonia needed for protein synthesis in the absence of O 2 .…”

Section: Discussionmentioning

confidence: 99%

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Plant and Cyanobacterial Hemoglobins Reduce Nitrite to Nitric Oxide under Anoxic Conditions

2011

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The ability of ferrous hemoglobins to reduce nitrite to form nitric oxide has been demonstrated for hemoglobins from animals, including myoglobin, blood cell hemoglobin, neuroglobin, and cytoglobin. In all cases, the rate constants for the bimolecular reactions with nitrite are relatively slow, with maximal values of ~5 M(-1) s(-1) at pH 7. Combined with the relatively low concentrations of nitrite found in animal blood plasma (normally no greater than 13 μM), these slow reaction rates are unlikely to contribute significantly to hemoglobin oxidation, nitrite reduction, or NO production. Plants and cyanobacteria, however, must contend with much higher (millimolar) nitrite concentrations necessitated by assimilatory nitrogen metabolism during hypoxic growth, such as the conditions commonly found during flooding or in waterlogged soil. Here we report rate constants for nitrite reduction by a ferrous plant hemoglobin (rice nonsymbiotic hemoglobin 1) and a ferrous cyanobacterial hemoglobin from Synechocystis that are more than 10 times faster than those observed for animal hemoglobins. These rate constants, along with the relatively high concentrations of nitrite present during hypoxia, suggest that plant and cyanobacterial hemoglobins could serve as anaerobic nitrite reductases in vivo.

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Section: ' Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Plant and Cyanobacterial Hemoglobins Reduce Nitrite to Nitric Oxide under Anoxic Conditions

2011

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“…Researchers have conducted numerous studies, extensively exploring these biotic stresses in the field [88][89][90][91]. Abiotic stresses, on the other hand, encompass adverse environmental conditions such as drought, heat, chilling, flooding, and salinity [92][93][94][95][96][97]. These stresses not only hinder plant growth and development but also impact nutritional composition, ultimately influencing maize grain quality.…”

Section: Factors Affecting Maize Productionmentioning

confidence: 99%

Advancements and Prospects of Genome-Wide Association Studies (GWAS) in Maize

Sahito,

Zhang,

Gishkori

et al. 2024

IJMS

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Genome-wide association studies (GWAS) have emerged as a powerful tool for unraveling intricate genotype–phenotype association across various species. Maize (Zea mays L.), renowned for its extensive genetic diversity and rapid linkage disequilibrium (LD), stands as an exemplary candidate for GWAS. In maize, GWAS has made significant advancements by pinpointing numerous genetic loci and potential genes associated with complex traits, including responses to both abiotic and biotic stress. These discoveries hold the promise of enhancing adaptability and yield through effective breeding strategies. Nevertheless, the impact of environmental stress on crop growth and yield is evident in various agronomic traits. Therefore, understanding the complex genetic basis of these traits becomes paramount. This review delves into current and future prospectives aimed at yield, quality, and environmental stress resilience in maize and also addresses the challenges encountered during genomic selection and molecular breeding, all facilitated by the utilization of GWAS. Furthermore, the integration of omics, including genomics, transcriptomics, proteomics, metabolomics, epigenomics, and phenomics has enriched our understanding of intricate traits in maize, thereby enhancing environmental stress tolerance and boosting maize production. Collectively, these insights not only advance our understanding of the genetic mechanism regulating complex traits but also propel the utilization of marker-assisted selection in maize molecular breeding programs, where GWAS plays a pivotal role. Therefore, GWAS provides robust support for delving into the genetic mechanism underlying complex traits in maize and enhancing breeding strategies.

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“…The main stresses that affect maize plant in the field are being extensively studied. They include drought [4,5], heat [6], chilling [7][8][9], flood [10], fungi and viruses [11,12], parasitic plants [13], insects [14], pesticides [15], herbicides [16,17], heavy metals [18,19], poor nutrients [20,21], soil salinity [22] and soil acidity [23,24]. Ongoing climate change is expected to aggravate this burden.…”

Section: Introductionmentioning

confidence: 99%

Genetic Approaches to Enhance Multiple Stress Tolerance in Maize

Malenica

Dunić

Vukadinović

et al. 2021

Genes

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The multiple-stress effects on plant physiology and gene expression are being intensively studied lately, primarily in model plants such as Arabidopsis, where the effects of six stressors have simultaneously been documented. In maize, double and triple stress responses are obtaining more attention, such as simultaneous drought and heat or heavy metal exposure, or drought in combination with insect and fungal infestation. To keep up with these challenges, maize natural variation and genetic engineering are exploited. On one hand, quantitative trait loci (QTL) associated with multiple-stress tolerance are being identified by molecular breeding and genome-wide association studies (GWAS), which then could be utilized for future breeding programs of more resilient maize varieties. On the other hand, transgenic approaches in maize have already resulted in the creation of many commercial double or triple stress resistant varieties, predominantly weed-tolerant/insect-resistant and, additionally, also drought-resistant varieties. It is expected that first generation gene-editing techniques, as well as recently developed base and prime editing applications, in combination with the routine haploid induction in maize, will pave the way to pyramiding more stress tolerant alleles in elite lines/varieties on time.

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Responses to Oxygen Deprivation and Potential for Enhanced Flooding Tolerance in Maize

Cited by 4 publications

References 113 publications

Plant and Cyanobacterial Hemoglobins Reduce Nitrite to Nitric Oxide under Anoxic Conditions

Plant and Cyanobacterial Hemoglobins Reduce Nitrite to Nitric Oxide under Anoxic Conditions

Advancements and Prospects of Genome-Wide Association Studies (GWAS) in Maize

Genetic Approaches to Enhance Multiple Stress Tolerance in Maize

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