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Mycorrhizal status and host genotype interact to shape plant nutrition in field grown maize (Zea mays ssp. mays)

Journal Article · · Mycorrhiza
 [1];  [1];  [2];  [3];  [4];  [5];  [5];  [4];  [1]
  1. The Pennsylvania State University, State College, PA (United States)
  2. Centro de Investigación y de Estudios Avanzados (CINVESTAV-IPN), Irapuato, Guanajuato (México); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Centro de Investigación y de Estudios Avanzados (CINVESTAV-IPN), Irapuato, Guanajuato (México); Colegio de Postgraduados, Montecillo, Texcoco (México)
  4. Centro de Investigación y de Estudios Avanzados (CINVESTAV-IPN), Irapuato, Guanajuato (México)
  5. Donald Danforth Plant Science Center, St. Louis, MO (United States)
Arbuscular mycorrhizal fungi (AMF) establish symbioses with the major cereal crops, providing plants with increased access to nutrients while enhancing their tolerance to toxic heavy metals. However, not all plant varieties benefit equally from this association. In this study, we used quantitative trait loci (QTL) mapping to evaluate the combined effect of host genotypic variation (G) and AMF across 141 genotypes on the concentration of 20 mineral elements in the leaves and grain of field grown maize (Zea mays spp. mays). Our mapping design included selective incorporation of a castor AMF-incompatibility mutation, allowing estimation of AMF, QTL and QTLxAMF effects by comparison of mycorrhizal and non-mycorrhizal plants. Overall, AMF compatibility was associated with higher concentrations of boron (B), copper (Cu), molybdenum (Mo), phosphorus (P), selenium (Se) and zinc (Zn) and lower concentrations of arsenic (As), iron (Fe), magnesium (Mg), manganese (Mn), potassium (K) and strontium (Sr). In addition to effects on individual elements, pairwise correlation matrices for element concentration differed between mycorrhizal and non-mycorrhizal plants. We mapped 22 element QTLs, including 18 associated with QTLxAMF effects that indicate plant genotype-specific differences in the impact of AMF on the host ionome. Although there is considerable interest in AMF as biofertilizers, it remains challenging to estimate the impact of AMF in the field. Our design illustrates an effective approach for field evaluation of AMF effects. Furthermore, we demonstrate the capacity of the ionome to reveal host genotype-specific variation in the impact of AMF on plant nutrition.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDA; USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2471452
Journal Information:
Mycorrhiza, Journal Name: Mycorrhiza Journal Issue: 5-6 Vol. 33; ISSN 0940-6360
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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