Arbuscular Mycorrhizal Fungi Inoculation and Water Regime Effects on Seedling P Uptake by Rice and Pearl Millet

Phoura Y and Akihiko Kamoshita ()
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Phoura Y: Asian Research Center for Bioresource and Environmental Sciences (ARC-BRES), Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Midoricho Nishitokyo, Tokyo 188-0002, Japan
Akihiko Kamoshita: Asian Research Center for Bioresource and Environmental Sciences (ARC-BRES), Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Midoricho Nishitokyo, Tokyo 188-0002, Japan

Agriculture, 2025, vol. 15, issue 7, 1-17

Abstract: Mycorrhizal-mediated seedling establishment may reduce dependency on chemical fertilizers, but the effectiveness of infection for growth may differ depending on species with different eco-physiological adaptations. The infection of arbuscular mycorrhizal fungi (AMF) and P uptake were compared between rice ( Oryza sativa L.) (Koshihikari (rice k ), Togo4 (rice t )), and pearl millet ( Pennisetum glaucum (L.) R. Br.) (ICMB89111 (millet 891 ), ICMB95444 (millet 954 )) seedlings (i) in response to three different commercial AMF inoculants of Rhizoglomus irregulare (popular inoculant Dr. Kinkon (I 1 ); two new inoculants Rootella P (I 2 ) and Rootella F (I 3 )) in comparison with indigenous AMF from Andosol upland and paddy topsoils (Exp. 1–2 as the inoculant experiments) and (ii) across different water regimes from upland to flooded lowland conditions for I 1 inoculant (Exp. 3–4 as the water regime experiments). The new inoculants I 2 and I 3 with higher propagule numbers showed a higher infection rate than the control seedlings in both rice and pearl millet, with a tendency for slower leaf development and no seedling growth enhancement. I 1 inoculant had more significant positive effects on the root transversal area and shoot growth parameters than the control. The infection rates of all three inoculants were lower than the indigenous AMF from upland Andosol in rice and pearl millet, in which a higher infection rate led to higher P uptake found in millet 954 . I 1 inoculant increased the infection rate in pearl millet and rice but had no clear indication of interaction with water regimes. A higher infection rate led to higher P uptake and shoot dry weight in pearl millet but not in rice with higher root length density. This study provided the significance of inoculants for seedling establishment and highlighted more mycorrhizal-mediated P uptake in pearl millet than in rice.

Keywords: arbuscular mycorrhizal fungi; inoculation; pearl millet ( Pennisetum glaucum (L.) R. Br.); rice ( Oryza sativa L.); water regime (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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