Improved phosphorus (P) use efficiency for crop production is needed given the depleting phosphorus ore deposits and increasing ecological concerns about its excessive use. Root system architecture (RSA) is important in efficiently capturing immobile P in soils, while agronomically, localized P application near the roots is a potential approach to address this issue. However, the interaction between genetic traits of RSA and localized P application has been little understood. Near-isogenic lines (NILs) and their parent of rice (qsor1-NIL, Dro1-NIL, and IR64, with shallow, deep, and intermediate root growth angles (RGA), respectively) were grown in flooded pots after placing P near the roots at transplanting (P-dipping). The experiment identified that the P-dipping created an available P hotspot at the soil surface; the qsor1-NIL had the greatest root biomass and root surface area in the 0–3 cm soil layer despite no genotype differences in total values; the qsor1-NIL had significantly greater biomass and P uptake than the other genotypes in the P-dipping. The superior surface root development of qsor1-NIL could have facilitated P uptakes from the P hotspot, implying that P-use efficiency in crop production can be further increased by combining genetic traits of RSA and localized P application.
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Posted 05 Jan, 2021
On 05 Mar, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
Invitations sent on 08 Feb, 2021
On 02 Feb, 2021
On 31 Dec, 2020
On 30 Dec, 2020
On 30 Dec, 2020
Posted 05 Jan, 2021
On 05 Mar, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
Received 17 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
On 08 Feb, 2021
Invitations sent on 08 Feb, 2021
On 02 Feb, 2021
On 31 Dec, 2020
On 30 Dec, 2020
On 30 Dec, 2020
Improved phosphorus (P) use efficiency for crop production is needed given the depleting phosphorus ore deposits and increasing ecological concerns about its excessive use. Root system architecture (RSA) is important in efficiently capturing immobile P in soils, while agronomically, localized P application near the roots is a potential approach to address this issue. However, the interaction between genetic traits of RSA and localized P application has been little understood. Near-isogenic lines (NILs) and their parent of rice (qsor1-NIL, Dro1-NIL, and IR64, with shallow, deep, and intermediate root growth angles (RGA), respectively) were grown in flooded pots after placing P near the roots at transplanting (P-dipping). The experiment identified that the P-dipping created an available P hotspot at the soil surface; the qsor1-NIL had the greatest root biomass and root surface area in the 0–3 cm soil layer despite no genotype differences in total values; the qsor1-NIL had significantly greater biomass and P uptake than the other genotypes in the P-dipping. The superior surface root development of qsor1-NIL could have facilitated P uptakes from the P hotspot, implying that P-use efficiency in crop production can be further increased by combining genetic traits of RSA and localized P application.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
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