| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
Two aquatic Potamogeton plants, amphibious P. wrightii and obligate submerged P. perfoliatus, are closely related but ecologically diverse. By the exogenous abscisic acid (ABA) treatment, both plants produced stomatal leaves and could survive on land. However, under salinity or low temperature treatments, which promote ABA biosynthesis, stomatal leaves underwater were formed only in P. wrightii. The expression of key enzyme genes in ABA biosynthesis was consistently up-regulated in P. wrightii, but only temporarily in P. perfoliatus under salinity stress. These results suggest that the two Potamogeton species have an innate morphogenetic ability to grow on land, but the actual production of shoot with stomatal leaves depends on ABA-mediated stress responses specific to each species and habitat.
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