Maize drought tolerance: Potential improvements through arbuscular mycorrhizal symbiosis?

Boomsma, Christopher R.; Vyn, Tony J.

doi:10.1016/j.fcr.2008.03.002

Cited by 126 publications

(83 citation statements)

References 116 publications

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“…Most studies have shown positive effects of AMF on host plant growth and development under conditions of low soil fertility (Jeffries and Rhodes 1987). Several studies have also indicated that AMF can help plants survive freezing and drought conditions (Klironomos et al 2001;Liu et al 2007;Boomsma and Vyn 2008). Therefore, AMF may make an important contribution to the productivity of oats grown in Qinghai province where the climate is characterized by low temperatures and arid conditions.…”

Section: Introductionmentioning

confidence: 99%

Geographical and plant genotype effects on the formation of arbuscular mycorrhiza in Avena sativa and Avena nuda at different soil depths

Yang

Zhang

et al. 2010

Biol Fertil Soils

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We have examined the influence of host plant genotype and geographical characters on the vertical distribution pattern of arbuscular mycorrhiza associated with Avena. The degree of colonization of oat roots at different soil depths (0-10, 10-20, 20-30, 30-40, 40-50 cm) was compared among three habitats from lower to higher altitude and six different cultivars in one specific habitat. Altitude had no impact on the percentage of root length colonized by mycorrhiza. However, oats growing at the higher altitudes formed more abundant arbuscules and vesicles within their roots. Plant genotype showed a significant influence on the percentage of root length colonized and abundance of arbuscules and vesicles, and there was much greater colonization of naked oat than of husk oat (common oat). The vertical distribution pattern of mycorrhizal root length was similar in terms of geographical and genotypic aspects, with the most extensive root colonization occurring in the topsoil and decreasing with increasing soil depth. However, the percentage of root length colonized by arbuscular mycorrhizal fungi (AMF) remained at about 20% colonization at a depth of 40-50 cm. Intraradical structures also showed a decreasing trend with increasing soil depth. The results suggest that an AMF "gene bank" may persist in the subsoil, and this may facilitate the ecological restoration of degraded agricultural areas.

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Section: Introductionmentioning

confidence: 99%

Geographical and plant genotype effects on the formation of arbuscular mycorrhiza in Avena sativa and Avena nuda at different soil depths

Yang

Zhang

et al. 2010

Biol Fertil Soils

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“…Drought stress often occurs in parallel during rapid growth and grain filling period, which lead to about 10% loss in total grain output worldwide (Farooq et al, 2009;Celebi et al, 2010), and this situation seems to deteriorate in recent years, due to human disturbances and climate changes (Gong et al, 2013). Cereal plants have specific complex adaptation strategies to cope with drought stress, these mechanisms involve changes at cellular and whole-plant levels (Boomsma and Vyn, 2008;Farooq et al, 2014). However, only limited studies have been done on the development of physiological approaches for improving drought tolerance of minor cereals in arid and semi-arid areas.…”

Section: Introductionmentioning

confidence: 99%

Dark Septate Endophyte Improves Drought Tolerance in Sorghum

Zhang¹,

Gong²,

Yuan³

et al. 2017

IJAB

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Dark septate endophytes (DSE) protect host plants against a variety of environmental stresses, however our knowledge about the roles of DSE in improving drought tolerance of crops is poor. In this study, sorghum (Sorghum bicolor L. Moench) was inoculated with a DSE strain (Exophiala pisciphila GM25) under two different soil water conditions (well-watered (WW), -0.11 MPa; drought-stressed (DS), -0.69 MPa) for one month. At the end of this experiment, sorghum roots were obviously colonized by DSE with 50.5%-62.5% colonization rate. When compared with non-inoculated seedlings under both WW and DS conditions, E. pisciphila-inoculated sorghum had greater plant height, collar diameter, shoot dry weight, net photosynthetic rate (Pn), stomatal conductance (g s ), transpiration rate (E), maximal photochemical efficiency of PSII photochemistry (Fv/Fm) and actual quantum yield (PSII), and lower intercellular CO 2 concentration (Ci). In addition, in comparison to noninoculation under DS conditions, E. pisciphila inoculation also improved the root dry weight, non-photochemical quenching values (NPQ), photochemical quenching values (qP), increased the content of related secondary metabolites including anthocyanin, polyphenol and flavonoid and enhanced the enzymatic activities related to secondary metabolism, such as cinnamyl alcohol dehydrogenase (CAD), phenylalanine ammonia-lyase (PAL), guaiacol peroxidase (G-POD) in sorghum seedlings. Our results demonstrated that the drought resistance of sorghum seedlings were positively improved by E. pisciphila inoculation with better plant growth, gas exchange, photosynthesis, chlorophyll fluorescence, secondary metabolites and enzyme activities related to secondary metabolism. Inoculation with E. pisciphila is an efficient strategy to survive for sorghum in drought environment.

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“…As obligate symbionts, AM fungi rely on carbon provided by their plant hosts to complete their life cycle. In exchange, the fungi not only improve the mineral nutrition (particularly phosphate) of the partner but also enhance protection against pathogens as well as drought tolerance (Boomsma and Vyn, 2008;Smith and Read, 2008;Hao et al, 2012;Jung et al, 2012).…”

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confidence: 99%

Abscisic Acid Promotion of Arbuscular Mycorrhizal Colonization Requires a Component of the PROTEIN PHOSPHATASE 2A Complex

et al. 2014

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Noble Foundation, Ardmore, Oklahoma 73401 (J.W., K.S.M.)Legumes can establish intracellular interactions with symbiotic microbes to enhance their fitness, including the interaction with arbuscular mycorrhizal (AM) fungi. AM fungi colonize root epidermal cells to gain access to the root cortex, and this requires the recognition by the host plant of fungus-made mycorrhizal factors. Genetic dissection has revealed the symbiosis signaling pathway that allows the recognition of AM fungi, but the downstream processes that are required to promote fungal infection are poorly understood. Abscisic acid (ABA) has been shown to promote arbuscule formation in tomato (Solanum lycopersicum). Here, we show that ABA modulates the establishment of the AM symbiosis in Medicago truncatula by promoting fungal colonization at low concentrations and impairing it at high concentrations. We show that the positive regulation of AM colonization via ABA requires a PROTEIN PHOSPHATASE 2A (PP2A) holoenzyme subunit, PP2AB91. Mutations in PP2AB91 cause reduced levels of AM colonization that cannot be rescued with permissive ABA application. The action of PP2AB91 in response to ABA is unlinked to the generation of calcium oscillations, as the pp2aB91 mutant displays a normal calcium response. This contrasts with the application of high concentrations of ABA that impairs mycorrhizal factorinduced calcium oscillations, suggesting different modes of action of ABA on the AM symbiosis. Our work reveals that ABA functions at multiple levels to regulate the AM symbiosis and that a PP2A phosphatase is required for the ABA promotion of AM colonization.

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Maize drought tolerance: Potential improvements through arbuscular mycorrhizal symbiosis?

Cited by 126 publications

References 116 publications

Geographical and plant genotype effects on the formation of arbuscular mycorrhiza in Avena sativa and Avena nuda at different soil depths

Geographical and plant genotype effects on the formation of arbuscular mycorrhiza in Avena sativa and Avena nuda at different soil depths

Dark Septate Endophyte Improves Drought Tolerance in Sorghum

Abscisic Acid Promotion of Arbuscular Mycorrhizal Colonization Requires a Component of the PROTEIN PHOSPHATASE 2A Complex

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