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Title: Characterization and Regulation of Aquaporin Genes of Sorghum [Sorghum bicolor (L.) Moench] in Response to Waterlogging Stress

Journal Article · · Frontiers in Plant Science
 [1];  [2];  [1];  [1];  [3];  [4];  [1]
  1. Univ. of Missouri, Columbia, MO (United States). Division of Plant Sciences
  2. Univ. of Florida, Gainesville, FL (United States)
  3. Univ. of Florida, Gainesville, FL (United States). Inst. of Food Agricultural Sciences, Univ. of Florida Genetics Inst.
  4. Univ. of Missouri, Columbia, MO (United States). Center for Agroforestry

Waterlogging is a significant environmental constraint to crop production, and a better understanding of plant responses is critical for the improvement of crop tolerance to waterlogged soils. Aquaporins (AQPs) are a class of channel-forming proteins that play an important role in water transport in plants. This study aimed to examine the regulation of AQP genes under waterlogging stress and to characterize the genetic variability of AQP genes in sorghum (Sorghum bicolor). Transcriptional profiling of AQP genes in response to waterlogging stress in nodal root tips and nodal root basal regions of two tolerant and two sensitive sorghum genotypes at 18 and 96 h after waterlogging stress imposition revealed significant gene-specific pattern with regard to genotype, root tissue sample, and time point. For some tissue sample and time point combinations, PIP2-6, PIP2-7, TIP2-2, TIP4-4, and TIP5-1 expression was differentially regulated in tolerant compared to sensitive genotypes. The differential response of these AQP genes suggests that they may play a tissue specific role in mitigating waterlogging stress. Genetic analysis of sorghum revealed that AQP genes were clustered into the same four subfamilies as in maize (Zea mays) and rice (Oryza sativa) and that residues determining the AQP channel specificity were largely conserved across species. Single nucleotide polymorphism (SNP) data from 50 sorghum accessions were used to build an AQP gene-based phylogeny of the haplotypes. Phylogenetic analysis based on single nucleotide polymorphisms of sorghum AQP genes placed the tolerant and sensitive genotypes used for the expression study in distinct groups. Expression analyses suggested that selected AQPs may play a pivotal role in sorghum tolerance to water logging stress. Further experimentation is needed to verify their role and to leverage phylogenetic analyses and AQP expression data to improve waterlogging tolerance in sorghum.

Research Organization:
Univ. of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office; USDOE Office of International Affairs (IA)
Grant/Contract Number:
PI0000031
OSTI ID:
1389270
Alternate ID(s):
OSTI ID: 1767994
Journal Information:
Frontiers in Plant Science, Vol. 8; ISSN 1664-462X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Waterlogging affects plant morphology and the expression of key genes in tef ( Eragrostis tef ) journal April 2018
Effects of mycorrhizas on physiological performance and root TIPs expression in trifoliate orange under salt stress journal April 2019
The leaf-air temperature difference reflects the variation in water status and photosynthesis of sorghum under waterlogged conditions journal July 2019
Waterlogging affects plant morphology and the expression of key genes in tef ( Eragrostis tef ) text January 2018