| Project/Area Number |
02556005
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
園芸・造園学
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| Research Institution | Ishikawa Agricultural College |
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Principal Investigator |
KANO Yasutaka Ishikawa Agric. Coll. Associated Prof., 農学部, 助教授 (80115823)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUOKA Nobuyuki Ishikawa Sand Dune Agric.Stn. Engineer, 技師 (40199196)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1992: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1991: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1990: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Hollowing / Intercellular air space / Proliferation of parenchymatous cell / High soil temperature / Auxin / Lignin / CPPU / Planting density / 源助ダイコン / 空洞発生 / 木部柔細胞 / 道管群 / 離反速度 / 高地温処理 / オ-キシン処理 / 道管の数 |
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| Research Abstract |
The Japanese radish cv.Gensuke has been largely cultivated in Ishikawa Prefecture for its flavor. When sown in July, however, it often develops a longitudinal hollow gap in the central style, thus lowering t he quality of the root. This study aimed to produce 'Gensuke' root of high quality under summer-sown culture.
1. Under high soil temperature lignin formation was recognized on parenchymatous cells abutting on the intercellular air space in the central region of the root, and hollowing was clearly observed developing.
2. When the plant was treated with high soil temperature and auxin during the middle growing stage intercellular air spaces coalesce into a large hollowing for want of proliferation of large parenchymatous c ells, which prevents the cells intruding into the air space as a result of active lignin formation on parenchymatous cells abutting on the air space.
3. Lignin formation and hollowing development was repressed by the treatment of a kind of cytokinins, CPPU {N-(2-chloro-4-pyridyl)-N'-phenylurea} due to active proliferation of parenchymatous cells in the central region of the root even under high soil temperature.
4. When plants were grown under low plating density, root growth was accelerated and hollowing developed in the root. When plants were grown under high planting density, root growth was sup-pressed and no hollowing developed.
Therefore, genesis of intercellular air space in the central region of the root and lignin formation in the walls of parenchymatous cells abutting on the space are necessary for the development of hollowing in the root. From these results, it is reasonable to consider that foliar spraying of CPPU is one of the most practical means to produce 'Gensuke' root of high quality under summer-sown culture.
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