| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Densely branched lateral roots (DBLRs) in Sesbania cannabina are formed in response to patchily distributed phosphorus (P). DBLR formation is one of the P-acquisition strategies of S. cannabina. DBLRs were produced with secondary to quaternary lateral roots after primary roots passed near P fertilizer. Pi content per DBLR increased as DBLRs develop, resulting in higher shoot growth. Under P-deficient conditions, the activity of PEPC and APase increased in non-DBLR roots, but these activities were significantly lower in DBLRs in the same plants. AMF inoculation changed the root system architecture by significantly decreasing the numbers of DBLRs and AMF colonization was lower in DBLR formation compared to normal roots. Our results indicate that DBLR formation is one of the P-coacquisition strategies of S. cannabina. The traits of roots that form DBLR are clearly different in morphological, biochemical response and AMF symbiosis from non-DBLR roots.
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