Growth and reproduction of asexual konjak plants (Amorphophalus konjac K. koch) |
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Authors: | Yota Yokoi Makoto Kimura Nobuo Nomoto |
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Institution: | (1) Biological Laboratory, College of Liberal Arts and Sciences, Kitasato University, Sagamihara, 228 Kanagawa;(2) Department of Biology, Faculty of Science, Tokyo Metropolitan University, Hachioji, 192-03 Tokyo;(3) Department of Biology, Faculty of Science, Ibaraki University, Mito, 310 Ibaraki |
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Abstract: | To examine the differences of the growth and reproduction of different-aged plants, 0-, 1-, and 2-year plants ofAmorphophalus konjac were investigated. RGR and daily net production per unit productive part, relative net-production rate (α′), of the 0-year
plant were largest, although NAR was highest in the 2-year plant. This was due to the large LAR of the 0-year plant, owing
to its large SLA. With increase in age, LAR decreased and NAR increased. Thus, it appeared that the age of plant exerts two
opposite effects on dry-matter production. Since these effects cancel each other out, differences in RGR and α′ between the
two older plants were not significant. We estimated that plant size appears to be primarily responsible for these effects.
The 0-year plant showed the least distribution ratio of net production into reproductive (storage) organs, and the highest
productivity of the reproductive part. The ratio of the production of corm to total reproductive-part production, the D-reproduction
index, was independent of age, and critical size in vegetative propagation could not be detected. |
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Keywords: | Age effect Amorphophalus konjac Dry-matter production Growth Reproduction Size effect |
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