テンサイ根腐病による根冠部のアミノ態窒素含量の変化

日本作物学会紀事

中司 啓二¹  岡崎 和之¹  高橋 宙之¹  大潟 直樹¹  田口 和憲¹ 

[1] 農業・生物系特定産業技術研究機構北海道農業研究センター

关键词: Amino nitrogen;    アミノ態窒素;    Rhizoctonia root rot resistance;    根腐病抵抗性;    Sucrose;    根中糖分;    Sugar beet;    テンサイ;    Sugar quality;    製糖品質;   

DOI  :  10.1626/jcs.74.357

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The α-amino nitrogen (A-N) contained in the roots and crowns of sugar beet is one of the harmful non-sugars that deteriorate the quality of sugar beet roots. This research was conducted to investigate the amount and distribution of the A-N and sucrose in the crown roots of the O-type (maintainer of male-sterile lines) sugar beets, which were suffered from root rot caused by artificial field inoculation with the fungus Rhizoctonia solani. The amount of A-N in all lines examined was increased by the infection with the fungus irrespective of the resistance to the disease. In the uninfected field, however, all the resistant lines contained a large amount of A-N, over 2 meq⁄100g, in the crown root than the susceptible one. On the other hand, the sucrose content of the crown roots was decreased by the infection with the fungus; the degree of decrease was less in resistant lines than in the susceptible ones. In the diseased plants, distribution pattern of A-N in the roots was different from that in healthy plants. The concentration of A-N was higher in the center of vascular bundles and lower in the epidermal region of the roots in the diseased plants. In conclusion, Rhizoctonia root rot deteriorated the quality of sugar beet root by decreasing the sucrose content and increasing the A-N amount of the roots. Although the A-N deteriorates the quality of sugar beet, O-type sugar beet that is resistant to Rhizoctonia root rot contained a large amount of A-N. This makes it difficult to breed high-quality sugar beets with high resistance to Rhizoctonia root rot.

【 授权许可】

Unknown