Physiological mechanism on the strong-culm for developing superior lodging resistant rice varieties

2014 Fiscal Year Final Research Report

• Project/Area Number: 25660014
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: OOKAWA Taiichiro 東京農工大学, (連合)農学研究科(研究院), 准教授 (80213643)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 水稲 / 倒伏抵抗性 / 強稈 / セルロース / ヘミセルロース / 皮層繊維組織 / リーフスター

Outline of Final Research Achievements

When developing new rice varieties for human food, feed and biofuel, the main goals are to enhance biomass production and lodging resistance. Among the improved varieties, Leaf Star has the highest bending moment at the basal culm at breaking because of its large section modulus, which is an indicator of culm thickness and higher bending stress, and thus, culm stiffness. Thus, Leaf Star has superior resistance to lodging because of its combination of culm thickness and culm stiffness. In this study, we investigated which traits are responsible for strong culm strength using strong-culm variety Leaf Star and its parents. The densities of both cellulose and hemicellulose in Leaf Star were higher than those in Chugoku 117. The cortical fiber tissue in the basal internode was thicker in Leaf Star than in Chugoku 117. The secondary walls of the cortical fiber cells of Leaf Star and Koshihikari were well-developed, whereas many hollow cortical fiber cells were observed in Chugoku 117.

Free Research Field

作物学