Effects of Molybdenum on Growth and Nitrogen Uptake/Utilization of <i>Malus sieversii</i> Seedlings

XIA Ying; CAO Hongjian; DING Li; WANG Long; JIANG Yinglin; TIAN Ge; JIANG Yuanmao

doi:10.19303/j.issn.1008-0384.2022.005.010

Volume 37 Issue 5

May 2022

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Article Navigation > Fujian Journal of Agricultural Sciences > 2022 > 37(5): 626-631

XIA Y, CAO H J, DING L, et al. Effects of Molybdenum on Growth and Nitrogen Uptake/Utilization of Malus sieversii Seedlings [J]. Fujian Journal of Agricultural Sciences，2022，37（5）：626−631 doi: 10.19303/j.issn.1008-0384.2022.005.010

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XIA Y, CAO H J, DING L, et al. Effects of Molybdenum on Growth and Nitrogen Uptake/Utilization of Malus sieversii Seedlings [J]. Fujian Journal of Agricultural Sciences，2022，37（5）：626−631 doi: 10.19303/j.issn.1008-0384.2022.005.010

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Effects of Molybdenum on Growth and Nitrogen Uptake/Utilization of Malus sieversii Seedlings

doi: 10.19303/j.issn.1008-0384.2022.005.010

1.
Weihai Academy of Agricultural Sciences, Weihai, Shandong　264200, China
2.
College of Horticulture Science and Engineering, Shandong Agricultural University, Taian, Shandong　271018, China

Received Date: 2021-12-23
Rev Recd Date: 2022-04-19
Publish Date: 2022-05-28

Abstract

Abstract

Objectives Effects of molybdenum (Mo) on the growth and nitrogen uptake/utilization of Malus sieversii seedlings were studied for the cultivation and crop production improvements. Methods M. sieversii seedlings were grown under 5 levels of Mo supply equivalent to 0.00 (CK), 0.25 (M1), 0.50 (M2), 1.50 (M3), and 3.00 μmol·L⁻¹ (M4) H₂MoO₄·H₂O. The ¹⁵N utilization and Ndff (i.e., rate of ¹⁵N absorbed by a plant organ from ¹⁵N in fertilizer to total nitrogen in the organ) were determined using the ¹⁵N labeled tracer method. The growth, root morphology, and nitrate reductase (NR) activity in leaves of the seedlings were monitored. Results The Mo applications significantly altered the biomass and ¹⁵N utilization rate of seedlings in an increasing pattern with increasing Mo to peak at M2 (the ¹⁵N utilization rate was 123% of that of CK), then followed by a decline. From 0 to 0.5 μmol Mo·L⁻¹, the length, surface area, number of tips and activities of the seedling roots, the NR in the leaves, and the Ndff of all organs significantly increased. But further increasing Mo from 1.5 to 3.0 μmol·L⁻¹ caused significant decreases on all indicators to become not significantly different from those under the M1 treatment. Conclusions By treating potato rootstocks with Mo at 0.5 μmol·L⁻¹, the seedling growth, root formation, and plant nitrogen absorption were enhanced. The seedling ¹⁵N utilization rate was maximized by the treatment that effectively promoted nitrogen reduction due to the increased nitrate reductase activity.
- Malus sieversii,
- molybdenum,
- root,
- nitrogen,
- ¹⁵N utilization

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References(31)

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