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Sato M.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn | Sato M.,Iwate University | Igarashi T.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn | Sakurai M.,Hokkaido Research Organization Central Agriculture Exp Statn | And 3 more authors.
Japanese Journal of Crop Science | Year: 2011

A simple method for predicting the grain protein content (GPC) of spring wheat from plant characters at heading in the field was developed by using the field data for growth diagnosis at Hokkaido Kamikawa Agric. Exp Station and at neighboring farmer's fields for 3-4 years in Hokkaido, the northern part of Japan. GPC at maturity was strongly correlated with grain yield at plant nitrogen content (PNC) every 2 g m-2 from 8 to 14 g m-2 (r= 0.871~0.937, P <0.01). The PCN was correlated with "plant height×color value of the second leaf'" at heading time (r= 0.872, P < 0.01). The grain yield was correlated with "plant height×color value of the second leaf×number of ears" at heading time (r=0.826, P<0.01). These results indicate that a simple prediction of GPC is possible by using plant characters generally used for growth diagnosis at heading time. This prediction is useful to decide the amount of supplemental application of nitrogen at heading time.


Nakamichi K.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn | Igarashi T.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn | Takamatsu S.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn | Sato M.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn | Yanagihara T.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn
Japanese Journal of Crop Science | Year: 2014

The wheat cultivar "Kitahonami" was seeded and grown for 2 years in the northern region of Hokkaido, Japan, and the correlation of the number of leaves on the main stem (leaf number) and that of tillers per plant (tiller number) with the effective cumulative temperature were examined. The tiller number increased exponentially with increase in the leaf number. The leaf number and tiller number before wintering were estimated from the effective cumulative temperature using logistic curves with maximum number 7 for leaf number and 14 for tiller number. © 2014 by The Crop Science Society of Japan.


Nakamichi K.,Hokkaido Research Organization Kitami Agriculture Exp Statn | Ashikaga N.,Hokkaido Research Organization Kitami Agriculture Exp Statn | Kurushima M.,Hokkaido Research Organization Kitami Agriculture Exp Statn | Sato M.,Hokkaido Research Organization Kamikawa Agriculture Exp Statn | Yoshimura Y.,Hokkaido Research Organization Kitami Agriculture Exp Statn
Japanese Journal of Crop Science | Year: 2013

The hard spring wheat cultivars "Harukirari" and "Haruyokoi" were cultivated at the Kamikawa Agricultural Experiment Station, Hokkaido, for 3 years and their grain protein content, wheat ash content, flour protein content, flour ash content, ratio of break flour to middling flour (BM), dough water absorption, gluten index, and loaf volume were evaluated. The flour sifted from "Harukirari" had lower protein and ash contents than the flour sifted from "Haruyokoi". BM increased with the increase in the grain protein content, and was higher in "Harukirari" than in "Haruyokoi". As the flour protein content increased, dough water absorption and loaf volume increased, while the gluten index decreased. Dough water absorption and gluten index were lower in "Harukirari" than in "Haruyokoi", and loaf volume was larger in "Harukirari" than in "Haruyokoi", while the flour protein content was similar. Size-exclusion high-performance liquid chromatography revealed that the extractable polymeric protein content (EPP), extractable monomeric protein content (EMP), and unextractable monomeric protein content were positively correlated with the flour protein content. EMP, which mainly consists of gliadins, increased with the increase in flour protein content. When the flour protein content was the same, EPP and EMP were higher in "Harukirari" than in "Haruyokoi". However, the unextractable polymeric protein content was lower in "Harukirari" than in "Haruyokoi".

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