Impacts of barley root cortical aerenchyma on growth, physiology, yield components, and grain quality under field waterlogging conditions

Manik, S. M. Nuruzzaman; Quamruzzaman, Md.; Livermore, Mark; Zhao, Chenchen; Johnson, Peter; Hunt, I. V.; Shabala, Sergey; Zhou, Meixue

doi:10.1016/j.fcr.2022.108461

Cited by 12 publications

(17 citation statements)

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“…The formation of AR and RCA under waterlogging conditions has been reported for many crops, such as maize, soybean, tomato, and a deep-water rice [ 9 , 13 , 50 , 51 , 52 ]. Our previous experiments identified that AR and RCA formation are some of the most important traits associated with waterlogging tolerance in barley [ 9 , 18 ]. The introgression of a single major RCA-QTL into commercial barley varieties can increase the waterlogging tolerance without significant negative effects on yield and quality [ 18 ].…”

Section: Discussionmentioning

confidence: 99%

“…Our previous experiments identified that AR and RCA formation are some of the most important traits associated with waterlogging tolerance in barley [ 9 , 18 ]. The introgression of a single major RCA-QTL into commercial barley varieties can increase the waterlogging tolerance without significant negative effects on yield and quality [ 18 ].…”

Section: Discussionmentioning

confidence: 99%

“…Adventitious root scoring was also scored 1 to 10 after terminating two-month waterlogging treatment ( Figure 1 ). Redox potential (Eh) was measured with redox probe, according to the method in our previous report [ 18 ]. Mean soil Eh value was significantly lower in the waterlogged treatments (−406 mV) than that in the well-drained control (+212 mV), indicating highly saturated and hypoxic conditions under waterlogging.…”

Section: Methodsmentioning

confidence: 99%

“…Root cortical aerenchyma (RCA) formation in adventitious roots is another feature that enables plant adaptation to waterlogging conditions [ 17 , 18 ] by enhancing the internal diffusion of atmospheric and photosynthetic oxygen from the aerial parts to the waterlogged roots, allowing the roots to maintain aerobic respiration [ 19 ]. Aerenchyma formation increases the porosity of roots above the usual levels promoted by intercellular spaces [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…AR and RCA formation are most directly related to a plant’s superior ability to adapt to anoxic/toxic conditions [ 25 ]. Our previous study identified that those genotypes with higher proportion of AR and RCA formation provided substantial tolerance to prolonged waterlogging conditions and improved grain yield [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

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Genome-Wide Association Study Reveals Marker Trait Associations (MTA) for Waterlogging-Triggered Adventitious Roots and Aerenchyma Formation in Barley

Manik

Quamruzzaman

Zhao

et al. 2022

IJMS

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Waterlogging is an environmental stress, which severely affects barley growth and development. Limited availability of oxygen in the root zone negatively affects the metabolism of the whole plant. Adventitious roots (AR) and root cortical aerenchyma (RCA) formation are the most important adaptive traits that contribute to a plant’s ability to survive in waterlogged soil conditions. This study used a genome-wide association (GWAS) approach using 18,132 single nucleotide polymorphisms (SNPs) in a panel of 697 barley genotypes to reveal marker trait associations (MTA) conferring the above adaptive traits. Experiments were conducted over two consecutive years in tanks filled with soil and then validated in field experiments. GWAS analysis was conducted using general linear models (GLM), mixed linear models (MLM), and fixed and random model circulating probability unification models (FarmCPU model), with the FarmCPU showing to be the best suited model. Six and five significant (approximately −log10 (p) ≥ 5.5) MTA were identified for AR and RCA formation under waterlogged conditions, respectively. The highest −log10 (p) MTA for adventitious root and aerenchyma formation were approximately 9 and 8 on chromosome 2H and 4H, respectively. The combination of different MTA showed to be more effective in forming RCA and producing more AR under waterlogging stress. Genes from major facilitator superfamily (MFS) transporter and leucine-rich repeat (LRR) families for AR formation, and ethylene responsive factor (ERF) family genes and potassium transporter family genes for RCA formation were the potential candidate genes involved under waterlogging conditions. Several genotypes, which performed consistently well under different conditions, can be used in breeding programs to develop waterlogging-tolerant varieties.

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