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Landrace of japonica rice,Akamai exhibits enhanced root growth and efficient leaf phosphorus remobilization in response to limited phosphorus availability
Authors:Dissanayaka  D. M. S. B.  Maruyama  Hayato  Nishida  Sho  Tawaraya  Keitaro  Wasaki  Jun
Affiliation:1.Graduate School of Biosphere Science, Hiroshima University, Kagamiyama 1-7-1, Higashihiroshima, 739-8521, Japan
;2.Faculty of Agriculture, University of Peradeniya, Peradeniya, 20400, Sri Lanka
;4.Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
;5.Faculty of Agriculture, Yamagata University, Wakaba-machi 1-23, Tsuruoka, 997-8555, Japan
;
Abstract:Aims

Phosphorus (P) acquisition through extensive root growth and P allocation to different plant organs through efficient remobilization are important for acclimation of crop plants to P-limited environments. This study elucidated changes in rice root growth and leaf P-remobilization and their influence on grain yield under P deficiency.

Methods

Two pot experiments were conducted with (P100) and without (P0) inorganic P supply using two Japanese rice cultivars: Akamai (Yamagata) and Koshihikari. Multiple harvests were made until the panicle initiation stage. Root and shoot growth response, P acquisition, and temporal leaf P-remobilization efficiency were measured. A separate experiment ascertained the final yield and grain P status.

Results

The Akamai rice cultivar showed enhanced root growth and more acquired soil P. The Akamai root dry weight was 66% greater than that of Koshihikari under P0. Confronting P deficiency, Akamai remobilized some P from its lower mature leaves to upper younger leaves starting from early growth. The remobilized P fraction increased to 72% at panicle initiation under P0. Under P0, Akamai exhibited two-fold higher leaf P-remobilization efficiency than under P100.

Conclusions

Enhanced root growth that facilitates acquisition of more soil P through better soil exploration coupled with efficient leaf P remobilization from the early growth stage improves adaptation of Akamai rice cultivar to P-limited environments. Nevertheless, P-starvation responses did not facilitate higher grain yields in P-limited conditions.

Keywords:
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