Mechanisms of root elongaion under high pH condition

2014 Fiscal Year Final Research Report

• Project/Area Number: 25660048
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• 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)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 根伸長 / オオムギ / トマト / 細胞周期 / Ｐ-ＡＴＰａｓｅ

Outline of Final Research Achievements

Plant cells elongate well under acidic condition, thus the ability to elongate root against external high pH will be advantageous for survival on alkaline soil. We found that some plant species promote root elongation in alkaline nutrient solution. Barley facilitated cell proliferation and elongation in root apex under pH8 condition based on data from microscopy, the expression of cell cycle-related genes, and plasma membrane H+-ATPase activity. Then root growth of barley was maintained in pH8 nutrient solution. In contrast, we could not observed evidence of promotion of cell proliferation and elongation in tomato root apex when root elongation of tomato was reduced in pH8 nutrient solution. Fe and Mn were absorbed well from pH8 nutrient solution by both barley and tomato. We propose adaptation of barley to alkaline stress by root development.

Free Research Field

植物栄養学