Astragalus mongholicus BUNGE根の生育に及ぼす土壌環境の影響

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Astragalus mongholicus Bunge, which is one of the original plants of the crude drug "Huangqi (黄耆)" is not cultivated in Japan. The plant cultivated on trial in a field in Japan by direct planting developed a considerable amount of lateral roots when compared with those produced in China and those on the market. In order to clarify the causes of this vigorous emergence of lateral roots, the plant was cultivated in a root box (25 cm length × 2 cm width × 40 cm depth) to which 48-h water-logging treatment was applied 1, 2 and 4 weeks after sowing. The plant was also cultivated in the root box containing compound fertilizer (N : P : K = 12 : 8 : 10) layers at 5 and 20 cm depths from soil surface as a basal dressing. The root growth of the plant was studied to assess the effects of fertilizer layers and water-logging treatment. The water-logging treatment at weeks 1 and 2 after sowing significantly inhibited the tap root growth. In all the plots treated with water-logging, thick 1st order lateral roots, showing the same anatomical characteristics as tap roots, emerged at almost the same position of the tap root where water-logging treatments had been done. On the other hand, apparently, no obvious relationship was observed between the position of compound fertilizer layers and the developed position of thick 1st order lateral roots on the tap root. From these findings, we concluded that frequent development of thick 1st order lateral roots in direct planting may be closely related to the drainage condition and the depth of water level in the field in the early growth stage of plants.
日本生薬学会の論文
1995-12-20

Astragalus mongholicus BUNGE根の生育に及ぼす土壌環境の影響

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