Research articles
ScienceAsia 49 (2023):ID 311-319 |doi:
10.2306/scienceasia1513-1874.2023.006
Improvement of growth and phosphorus utilization efficiency
in Thai rice (Oryza sativa L. ssp indica cv. Chaew Khing) by
inoculation of arbuscular mycorrhizal fungi under high
phosphorus supply
Thanin Chantarachota
, Lompong Klinnaweeb,c,*
ABSTRACT: Arbuscular mycorrhizal fungi (AMF) provide benefits to host plants mainly by improving nutrition. In rice,
as in other plants, AMF colonization is promoted under phosphorus (P) deficiency, and the symbiosis can lead to an
improvement in P uptake and plant biomass. While there is economic potential for the fungi to substitute chemical
fertilizers for sustainable rice production, the current dogma holds that their benefits are nullified when used in fertile
soil. Here we show that inoculation of an AMF mixture in non-sterilized lowland paddy soil with high P availability
increased the degree of fungal colonization and the development of arbuscular mycorrhizal structures in ?Chaew Khing?
rice seedlings. The increase in AMF colonization was correlated with higher shoot growth in the AMF-inoculated
plants. Analysis of plant nutrient status indicated that the AMF treatment caused a reduction in the total P and Fe
concentrations in the shoot tissues and a reduction in the total N concentration in the root tissues of the mycorrhizal
plants. Nevertheless, the enhanced mycorrhizal colonization led to an increase in P utilization efficiency as well as N:P
and C:P ratios in the AMF-inoculated seedlings. These results indicate that, under high P supply, AMF can benefit the
host plant by enhancing more efficient use of P, rather than improving its uptake. This work highlights the potential
benefit of AMF inoculation for rice cultivation under high P availability.
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a |
Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science,
Chulalongkorn University, Bangkok 10330 Thailand |
b |
Division of Biological Science, Faculty of Science, Prince of Songkla University, Songkhla 90110 Thailand |
c |
Plant Cell and Physiology for Sustainable Agriculture Research Unit, Faculty of Science,
Prince of Songkla University, Songkhla 90110 Thailand |
* Corresponding author, E-mail: lompong.k@psu.ac.th
Received 5 Feb 2022, Accepted 24 Nov 2022
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