Influence of Moderately High Temperatures during Grain Filling on Glassy Grain Rate of Six-rowed Barley Variety ‘Shunrai’

日本作物学会紀事

article

岡村 夏海¹  澤田 寛子¹  平 将人²  新庄 莉奈³  岡村 昌樹¹  島崎 由美¹  関 昌子¹  池田 達哉⁴ 

[1] 農研機構中日本農業研究センター;農研機構九州沖縄農業研究センター;名古屋大学大学院生命農学研究科;農研機構西日本農業研究センター

关键词: Barley;    Glassy grain rate;    Grain filling;    High temperature;    Protein content;   

DOI  :  10.1626/jcs.92.19

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

For barley pearling in Japan, glassy grain rate is an important quality factor. However, the relationship between glassy grain rate and temperature has not been clarified. We investigated the effects of moderately high daytime and nighttime temperatures during the ripening period on the glassy grain rate of barley using phytotrons. The barley variety ‘Shunrai’ was tested under three conditions: high daytime temperature (HD: 25°C / 9°C), high nighttime temperature (HN: 20°C / 14°C), and control (CT: 20°C / 9°C) in 2016/2017 and 2017/2018. The HD group showed an increase in the glassy grain rate. This was possibly due to the decrease in grain weight and increase in grain protein content. The HN group did not show any decrease in grain weight or increase in grain protein content, and the glassy grain rate was similar to that in the CT group. Based on these results, we investigated the trends of starch, soluble sugars, N, and C content in the seed during the ripening process in the HD and CT groups in 2019/2020. Accumulation of starch and N was accelerated during the first half of ripening in the HD group, but the final starch synthesis per individual plant was reduced because the ripening period was shortened. The ratio of change in N content to C content (ΔN/ΔC) from flowering to physiological maturity increased. Protein content per grain increased in the HD group. Furthermore, electron microscopic observation of the endosperm in the HD group revealed that large starch granules became larger while small starch granules became smaller. These results suggest that the increase in glassy grain rate due to high daytime temperatures is mainly due to changes in the accumulation pattern of starch and cytoplasmic proteins in the endosperm and the accumulation of more cytoplasmic proteins. This study may serve as a stepping stone to understanding the factors that increase the glassy grain rate in barley production sites.

【 授权许可】

CC BY