2013 Fiscal Year Final Research Report

Investigation of dynamics in water infiltration in water absorption process of soybean seed

Research Project

Project/Area Number	24658013
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Single-year Grants
Research Field	Crop science/Weed science
Research Institution	Hokkaido University
Principal Investigator	JITSUYAMA Yutaka 北海道大学, (連合)農学研究科(研究院), 講師 (90322841)
Project Period (FY)	2012-04-01 – 2014-03-31
Keywords	耐湿性 / 種子 / 冠水害 / 発芽 / 吸水 / 受動 / 能動 / 微細構造
Research Abstract	Dried soybean seeds are prone to suffer waterlogging injury just after seeding if they are exposed to excess moisture. After 3 hr of waterlogging treatment, significant differences in seed survival were detected among cultivars. In addition, the passive imbibition during 10 - 30 min of waterlogging, and the capillary imbibition during 0 - 10 min of flooding were caused by significant differences in the imbibition rate among cultivars. Although neither imbibition showed a significant correlation with the survival directly, the ratio between the passive and the capillary imbibition rate was significantly correlated with survival. Factors affecting imbibition included the hydraulic conductivity of the seed coat and seed osmolarity, which were significantly correlated with the passive and the capillary imbibition rate, respectively.