| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Research Abstract |
Needles water status on the top of flatted crown in Pinus luchuensis at Miyakojma Island, Okinawa, the subtropical region was on the verge of wilting. We addressed the flat canopy formation in P.luchuensis from the standpoint of water relations. Judging from climate and geology of Miyakojima Island, P.luchuensis constantly suffered from sever water stress. Further, Miyakojima Island often is attacked by huge typhoons. Microscopic study showed that many wounds were made by mutually rushed branch. As a result of dye solution perfusion test, water conducting area of wounded part of branch was restricted to 1/2 of that of sound ones. Reducing the hydraulic conductivity in branch due to wounds induced lethal water deficit. Any further shoot growth induces a shoot die back due to wilting. This seems to cause to flattening of the upper canopy.
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