Symptoms of Abnormally Early Ripening in a Wheat Cultivar “Minaminokaori” Grown in Kumamoto Prefecture and the Causative Factors

日本作物学会紀事

Araki^1¹  Keisuke Mizuta^2²  Mitsuru Toma^6³  Ken-Ichi Tanno^7⁴  Tadashi Takahashi^8⁵  Kouichi Hatta^3⁶  Kazuhiro Nakamura^4⁷  Hitoshi Matsunaka^5⁸ 

[1] Grad. Sch. of Tech. for Innov., Yamaguchi Univ.^1;Grad. Sch. of Tech. for Innov., Yamaguchi Univ.^2;Grad. Sch. of Tech. for Innov., Yamaguchi Univ.^6;Grad. Sch. of Tech. for Innov., Yamaguchi Univ.^7;Grad. Sch. of Tech. for Innov., Yamaguchi Univ.^8;Hokkaido Agricultural Research Center, NARO^3;Kyushu Okinawa Agricultural Research Center, NARO^4;Kyushu Okinawa Agricultural Research Center, NARO^5

关键词: Abnormally early ripening;    Nitrogen content;    Nitrogen fertilizing;    Mineral fertilizers;    Wheat cultivar for bread;    Minaminokaori;    Leaf greenness;   

DOI  :  10.1626/jcs.87.21

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Abnormally early ripening, locally called “Kareure”, induces early senescence of leaves and poor grain filling. The objectives of this study were to find the cause of Kareure. Kareure occurred in trial fields in 2001/12 and 2012/13 where mineral or nitrogen fertilizers or both were additionally applied. Thousand grain weight in the trail fields was 15% and 30% lower in 2011/12 and 2012/13, respectively, than in fields where plants ripened normally (control). The mineral fertilizers rich in silicate, calcium and iron did not influence the thousand grain weight. In 2012/13, omitting of the top-dressed nitrogen made the symptoms worse and increase of top-dressed nitrogen after heading did not influence the symptoms. However, increase of basal nitrogen reduced the symptoms in 2012/13. Excision of spikes significantly alleviated early fall in greenness and relative water content of flag leaves. Cultivars that have been evaluated as susceptible to Kareure in other regions were also susceptible in this region. We discussed the possibility that Kareure might be induced by nitrogen deficiency that might also induce early decline of water uptake and senescence during grain filling.

【 授权许可】

CC BY