Identification of leaf-derived signal for inducing the secondary aerenchyma formation in soybean

2014 Fiscal Year Final Research Report

• Project/Area Number: 25660003
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Science in genetics and breeding
• Research Institution: Nagoya University
• Principal Investigator: NAKAZONO Mikio 名古屋大学, 生命農学研究科, 教授 (70282697)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: ダイズ / 二次通気組織 / 耐湿性 / 葉由来シグナル

Outline of Final Research Achievements

Under waterlogged conditions, soybean forms secondary aerenchyma (SA) in the hypocotyl. In this study, I used 2 cultivars, Asoaogari and Enrei. The SA formation is 1-2 days earlier in Asoaogari than in Enrei. The grafting of the 2 cultivars showed that the SA formation-promoting factors of Asoaogari exist in the hypocotyl, but not in leaves. On the other hand, I found that the SA formation was inhibited in the darkness or CO2 deficiency even under waterlogged conditions. The SA formation was inhibited under waterlogged conditions when we cut seedlings above the epicotyl, but sucrose loading to the cut surface recovered its formation. In the heat-girdled seedling under waterlogged conditions, the SA was formed only above the heat-girdled position. Moreover, sucrose was highly accumulated in the hypocotyl under waterlogged conditions. These results suggest that sucrose transport from leaves is important for the SA formation in soybean hypocotyls under waterlogged conditions.

Free Research Field

植物分子遺伝学