Crop Science

	Prof.HIRAI Yoshihiko Rice/Salt tolerance/Grain yield   Directory of Researchers

Studies on improving salt tolerance of crops

Varietal difference in salt tolerance

Various genes and physiological mechanisms are involved in the salt tolerance of rice. However, many aspects remain unclear, and the breeding of salt-tolerant varieties has not significantly advanced. To address this, we are focusing on understanding the physiological and morphological traits that improve the productivity of rice under salt-stress conditions. We also aim to identify genes affecting salt tolerance involved in the yield traits of rice. We are conducting analyses using chromosome segment substitution lines derived from salt-sensitive and tolerant varieties.

	Asst. Prof. TOMITA Asami Rice/breeding/abiotic stress tolerance   Directory of Researchers

Agronomic study for tolerance to nutrient stress under full irrigated lowland field in rice

Varietal difference in leaf bronzing of rice

In full irrigated lowland field, multiple nutritional problems, including excess iron or sulfide, decrease rice yield. They cause in acidic sulfate soils in Asia and Africa and in highly reduced soils in Japan, and tolerant varieties are essential. Focusing on the rice leaf bronzing and root morphological traits, we try to clarify the genetic and physiological mechanism for tolerant to nutritional disorders, and effect for rice yield. Based on these points, we aim to develop tolerant varieties and cultivation techniques.