Adaptive mechanisms for Fe deficiency based on optimization of primary metabolism in barley

2015 Fiscal Year Final Research Report

• Project/Area Number: 25292038
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Plant nutrition/Soil science
• Research Institution: Tokyo University of Agriculture
• Principal Investigator: Higuchi Kyoko 東京農業大学, 応用生物科学部, 教授 (60339091)
• Co-Investigator(Kenkyū-buntansha): SUZUI Nobuo 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門・量子ビーム応用研究センター, 研究副主幹 (20391287)
• Co-Investigator(Renkei-kenkyūsha): SAITO Akihiro 東京農業大学, 応用生物科学部, 助教 (10610355)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 鉄欠乏 / オオムギ / 一次代謝 / SnRK1 / 転流

Outline of Final Research Achievements

Newly emerged chlorotic leaves are heterotrophic, and older leaves simultaneously conduct photosynthesis, catabolism, and translocation of C and N to chlorotic leaves in Fe-deficient barley. We have focused on SnRK1 which promotes catabolism and suppresses anabolism under stress conditions generally. mRNA accumulation, in vitro activity, and in vivo activity of SnRK1 increased in chlorotic leaves of Ehimehadaka No.1, but not in chlorotic leaves of Shirohadaka, an Fe-deficiency susceptible cultivar. The balance of energy metabolism may contribute to the slow but steady growth of new leaves under the Fe-deficient condition. We have reported that the allocation of assimilates from older leaves to the roots and younger leaves contributes to the adaptation of barley to Fe deficiency that accompanies early senescence in older leaves. Fe-deficient barley may translocate metabolites derived from the catabolism of organic compounds that have been assimilated in older leaves.

Free Research Field

植物栄養学