Establishment of resistance to stresses caused by soil moisture fluctuation through strengthening the ability of plastic response ability of root system in rice

通过增强水稻根系塑性反应能力建立对土壤水分波动胁迫的抵抗能力

• 批准号: 22380013
• 负责人: YAMAUCHI Akira
• 金额: $ 11.81万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22380013/
• 关键词: 土壌ストレス; 変動ストレス; コアコレクション; 可塑性; 根; QTL; 染色体部分置換系統群; 天水田; 土壌水分; 染色体都分置換系統群; 土壌ストレス; 変動ストレス; コアコレクション; 可塑性; 根; QTL; 染色体部分置換系統群; 天水田; 土壌水分; 染色体都分置換系統群

This study aimed to examine the functional roles of the ability of the plant to change its development as environmental conditions change, which is known as phenotypic plasticity in crop adaptation to water stress such as drought as well as soil moisture fluctuation stress, and. We conducted a series of experiments to evaluate the functional roles of root plasticity by using various accessions/populations such as OryzaSNP germplasm set, chromosome segment substitution lines (CSSL) derived from Nipponbare and Kasalath cross, IR 64 INLs and a few promising genotypes for stress tolerance including NERICA (New Rice for Africa that is an interspecific cross between Oryza sativa and Oryza glaberrima). We used the rootbox-pinboard method, slant tube method, experimental bed installed with line source sprinkler system that can create gradient in drought stress intensities, and sloping bed that can create increasing rooting depths under field conditions for phenotyping root traits. These results consistently showed that in addition to deep roots, the plastic development of the root system is a key trait for plant adaptation to water stress. We also found that the plasticity in development of the entire root system is important in response to progressive drought, while that in lateral root development and aerenchyma formation is important in response to transient drought and O2 deficient conditions. We quantitatively showed the contributions of root plasticity to dry matter production through enhanced water uptake under water stress.

这项研究旨在检查随着环境条件的变化，植物改变其发育能力的功能作用，这被称为作物适应水胁迫（例如干旱）以及土壤水分波动应激等的表型可塑性。 We conducted a series of experiments to evaluate the functional roles of root plasticity by using various accessions/populations such as OryzaSNP germplasm set, chromosome segment substitution lines (CSSL) derived from Nipponbare and Kasalath cross, IR 64 INLs and a few promising genotypes for stress tolerance including NERICA (New Rice for Africa that is an interspecific cross between Oryza sativa和Oryza Glaberrima）。我们使用了用线源洒水装置系统安装的Rootbox-Pinboard方法，倾斜管方法，可以在干旱应力强度中产生梯度，以及在现场条件下为表型根特征创造出越来越多的生根深度的倾斜床。这些结果始终表明，除了深根外，根系的塑性发展是植物适应水应激的关键特征。我们还发现，整个根系的发展中的可塑性对渐进的干旱很重要，而在横向根发育和气氛形成中，对瞬态干旱和O2不足条件很重要。我们定量地表明了通过在水应力下增强水吸收来生产根对干物质生产的贡献。