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Mycorrhiza response and phosphorus acquisition efficiency of sorghum cultivars differing in strigolactone composition

  • Tilal Abdelhalim
  • Ramia Jannoura
  • Rainer Georg JoergensenEmail author
Regular Article
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Abstract

Aims

The function of strigolactone isomers in sorghum phosphorus acquisition efficiency (PAE) is still a matter of speculation. Therefore, the objective of this study was to investigate the effects of cultivar-specific strigolactone composition on sorghum growth indices, responsiveness of arbuscular mycorrhizal fungi (AMF), and PAE.

Methods

Two Striga-resistant (orobanchol-producing) and two Striga-susceptible (5-deoxystrigol-producing) sorghum (Sorghum bicolor (L.) Moench) cultivars were planted with and without AMF inoculation as well as with and without P fertilization. Growth indices and AMF colonization were measured 30 days after sowing from pot trial plants in a growth chamber.

Results

AMF colonization was highest in Tetron and lowest in IS9830, both Striga-resistant cultivars. Conversely, PAE was lowest in Tetron and highest in IS9830 and revealed strong positive relationships with root length, leaf area and shoot DW.

Conclusions

Although the strigolactone composition had no clear general effects on the growth indices of the four different sorghum cultivars, breeders should consider it for combining efficient AM symbiosis and high PAE values.

Keywords

Sorghum Arbuscular mycorrhizal fungi Strigolactones Orobanchol 5-deoxystrigol P acquisition efficiency 

Notes

Acknowledgements

We would like to thank Gabriele Dormann and Larissa Krause for their excellent laboratory assistance as well as Benjamin Bayerle and Leonard Theisgen for help with the experiment. This project was supported by the Volkswagen foundation providing a grant to Tilal Abdelhalim.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Soil Biology and Plant NutritionUniversity of KasselWitzenhausenGermany
  2. 2.White Nile Research StationAgricultural Research CorporationKostiSudan

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