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Isoda Laboratory |
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Improvement of productivity in leguminous crops
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Improvement of productivity in leguminous crops
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Leguminous crops, including soybean and peanut, are important resources for plant proteins and oils. However, the leguminous crops generally have lower yields than the cereals, i.e., rice or wheat.My major objective is to improve productivity in soybean and peanut as well as cereal crops, such as wheat and rice. When a breeder intends to breed a new genotype with high-yielding, he must figure out a genotype with desirable characteristics as concerning to high-yielding, which is called as an ideo-type. I am trying to describe an ideo-type (ideal crop) of soybean and peanut for high-yielding, in terms of canopy structure, way of dry matter distribution, sink-source relationship (ratio of seeds and leaf) and reactions to climatic conditions.In 2002, 2003 and 2004, very high yields of soybean were obtained, being more than 8000kg/ha !, in Xinjiang, China. I hope that these high yields must be a breakthrough for high-yielding in the leguminous crops. |
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Soybean |
Peanut* |
Rice |
| Japan |
1610
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2326
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6336
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| World |
2292
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2149
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4112
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| Average yields of soybean, peanut and rice（Unit：kg/ha， FAO yearbook 2006 *with shell) |
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| Soybean（Glycine max (L.) Merill） |
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Soybean is the most popular leguminous crop, originated in China. However, the degree of self-sufficiency of soybean in Japan is only 5% in 2000. One of our objectives is to establish an easy cultivation method for 4000kg/ha in Japan, and also to improve yield potentialities in arid area. |
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The field obtained more than 8000kg/ha（upper left), Comparison of Japanese and Chinese cultivars（upper right), |
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| One of promising strains (lower left), more than 150 pods per one plant! (lower right) |
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| Peanut（Arachis hypogaea L.) |
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Peanut originally comes from South America, and one of the most important leguminous oilseed crops following soybean. In Japan, Chiba prefecture has the largest cultivation area for peanut. Peanut is one of the principal agricultural products of this prefecture, although the production area is recently decreasing. Recently, I started the experiments to control sink-source relationship by using growth regulator (an inhibitor of endogenous gibberellin), comparative experiments of Chinese and Japanese cultivars with high-yieldings. |
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| The right side was treated by the growth regulator, turned to dark green and dwarfed |
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The upper left is the control, the others were treated by the growth regulator |
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Desirable Chinese cultivars， Luhua 11 (left), Huayu (right) |
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Phone : +81-47-308-8814 |
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| Graduate School of Horticulture, Chiba University |
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| E-mail : isoda@ |
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Dr. Akihiro Isoda |
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| Please attach 'faculty.chiba-u.jp' after '@' |
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