Rhizosheath formation and involvement in foxtail millet (<i>Setaria italica</i>) root growth under drought stress

Liu, Tie Yuan; Ye, Nenghui; Song, Tao; Cao, Yunying; Gao, Bei; Zhang, Di; Zhu, Feng; Chen, Moxian; Zhang, Yingjiao; Xu, Weifeng; Zhang, Jianhua

doi:10.1111/jipb.12716

Cited by 60 publications

(50 citation statements)

References 50 publications

(63 reference statements)

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“…In this experiment, the amount of transpiration from heading to harvest and the dehydration tolerance tended to be consistent ( Table 3). The amount of transpiration from heading to harvest of two species of Setaria was higher than that of two species of Panicum, and it was thought that the fine roots were densely developed as reported previously (Liu et al, 2019;Matsuura et al, 2012). The amount of transpiration after heading was clearly higher than that before heading, and it decreased greatly by water deficit treatment.…”

Section: Factors In Relation To Water Use Affecting Dehydration Tolersupporting

confidence: 63%

“…Foxtail millet (Setaria italica) is an annual crop that originated from S. viridis. S. italica is one of the most important food and foliage crops in semi-arid areas (Wen et al, 2012) because of thick cell walls, a dense root structure, small leaf area (Liu et al, 2019). The mean grain yield of S. italica is approximately 0.150 kg m −2 and is mainly cultured as a healthy food on the hilly and mountainous areas in Japan.…”

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confidence: 99%

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Factors related water and dry matter during pre- and post- heading in four millet species under severe water deficit

Matsuura

2019

Plant Production Science

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The objectives of this study are to clarify the relative importance of sink and related factors of dry matter and water use pre-and post-heading in four millet species under severe water deficit. Panicum miliaceum, Panicum sumatrense, Setaria glauca., and S. italica were used. Water deficit (20% soil water content) was imposed from 25 d after sowing until harvest, with 40% soil water as a control. At the heading, half of the leaf area or all leaves on each plant were removed in both the control and the water deficit treatment (Source manipulation). Water deficit treatment markedly decreased the leaf water potential of all species from −2.02 MPa (S. italica) to −1.72MPa (P. miliaceum). The grain yields of water deficit treatment in S. italica, P. miliaceum, S. glauca and P. sumatrense decreased to 62, 48, 31, and 24% of the control, respectively. Four millet species were divided to dehydration-tolerant millet (S. italica and P. miliaceum) and dehydration-susceptible millet (S. glauca and P. sumatrense) by calculating drought susceptibility index. The interspecific difference in dehydration tolerance was accounted for by the number of grains per panicle and the harvest index. The source operation showed that the sink was more important than the source. In conclusion, under severe soil drying, it was considered that S. italica and P. miliaceum showed strong dehydration tolerance because they maintained the number of grains per panicle and did not reduce dry matter production and the partitioning of dry matter to the panicle after heading. Abbreviations: CLA0: all leaves were removed at heading in the control; CLA0.5: half of the leaf area per plant was removed at heading in the control; DAS: days after sowing; DLA0: all leaves were removed at heading in the dehydration treatment; DLA0.5: half of the leaf area was removed at heading in the dry treatment; DSI: drought susceptibility index; NSC: nonstructural carbohydrate; OA: osmotic adjustment; WUE: water use efficiency.

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Section: Factors In Relation To Water Use Affecting Dehydration Tolersupporting

confidence: 63%

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confidence: 99%

Factors related water and dry matter during pre- and post- heading in four millet species under severe water deficit

Matsuura

2019

Plant Production Science

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“…These maize lines also show enhanced stomatal conductance, shoot photosynthesis, and biomass (van Oosterom et al, 2016;Gao and Lynch, 2016). Similar effects have been found in Setaria, wild Zea mays (teosinte), rice, and soybean (Sebastian et al, 2016;Lynch, 2018;Liu et al, 2018;Henry et al, 2011;Catolos et al, 2017;Ye et al, 2018). Further supporting this, a maize mutant unable to form nodal roots (rtcs) maintains better plant water status than the wild-type line (Sebastian et al, 2016).…”

Section: Modification Of Root System Architecturesupporting

confidence: 58%

Crop Biotechnology for Improving Drought Tolerance: Targets, Approaches, and Outcomes

Chater

Covarrubias

Acosta‐Maspons

2019

Annual Plant Reviews Online

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Human population growth and climate change threaten our food and water security. The increasing frequency of extreme drought events will cause major crop yield losses. To mitigate this threat to global food security, we need to rapidly select and/or develop new 'climate-ready' crop varieties that can withstand and flourish under water deficit, enabling the sustained and sustainable production of higher yields to support human life on Earth. In this article, we identify the current targets for crop plant improvement under drought, working from the ground up, with modifications in rooting, shoot, stomatal, and photosynthetic systems, and finally nutrient transport and sink strength. We argue that by using a holistic approach to crop development, prudently incorporating the natural variation available in crop wild relatives and cultivars with cutting-edge tools, such as molecular breeding and transgenics, we may be able to produce high-yielding crops under a range of conditions to meet our needs in a changing world.

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“…Factors involved in the maintenance of rhizosheaths may increase soil quality in general by increasing water flow, and thus nutrient flow and soil aeration through more frequent pores (Tisdall and Oades, 1982;Benard et al, 2019). During periods of drought, some grasses can increase the thickness of their rhizosheath, potentially in an effort to secure water uptake (Watt et al, 1994;Rabbi et al, 2018;Liu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Cereal root exudates contain highly structurally complex polysaccharides with soil‐binding properties

et al. 2020

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Summary Rhizosheaths function in plant−soil interactions, and are proposed to form due to a mix of soil particle entanglement in root hairs and the action of adhesive root exudates. The soil‐binding factors released into rhizospheres to form rhizosheaths have not been characterised. Analysis of the high‐molecular‐weight (HMW) root exudates of both wheat and maize plants indicate the presence of complex, highly branched polysaccharide components with a wide range of galactosyl, glucosyl and mannosyl linkages that do not directly reflect cereal root cell wall polysaccharide structures. Periodate oxidation indicates that it is the carbohydrate components of the HMW exudates that have soil‐binding properties. The root exudates contain xyloglucan (LM25), heteroxylan (LM11/LM27) and arabinogalactan‐protein (LM2) epitopes, and sandwich‐ELISA evidence indicates that, in wheat particularly, these can be interlinked in multi‐polysaccharide complexes. Using wheat as a model, exudate‐binding monoclonal antibodies have enabled the tracking of polysaccharide release along root axes of young seedlings, and their presence at root hair surfaces and in rhizosheaths. The observations indicate that specific root exudate polysaccharides, distinct from cell wall polysaccharides, are adhesive factors secreted by root axes, and that they contribute to the formation and stabilisation of cereal rhizosheaths.

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Rhizosheath formation and involvement in foxtail millet (Setaria italica) root growth under drought stress

Cited by 60 publications

References 50 publications

Factors related water and dry matter during pre- and post- heading in four millet species under severe water deficit

Factors related water and dry matter during pre- and post- heading in four millet species under severe water deficit

Crop Biotechnology for Improving Drought Tolerance: Targets, Approaches, and Outcomes

Cereal root exudates contain highly structurally complex polysaccharides with soil‐binding properties

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