Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

Investigating the Mechanisms Underlying the Durability and Sustainable Use of Pb1 Gene-Mediated High Field Resistance to Rice Panicle Blast

Kiyoshi Fujii
ORCID logo ,
Taro Suzuki
,
Mitsuru Nakamura
,
Tomofumi Yoshida
,
Yoshinori Uchikawa
,
Haruka Suwazono
,
Nagao Hayashi
,
Yasukazu Kanda
* ORCID logo ,
Haruhiko Inoue
*
Version 1 : Received: 19 May 2023 / Approved: 19 May 2023 / Online: 19 May 2023 (10:30:25 CEST)

A peer-reviewed article of this Preprint also exists.

Fujii, K.; Suzuki, T.; Nakamura, M.; Yoshida, T.; Uchikawa, Y.; Suwazono, H.; Hayashi, N.; Kanda, Y.; Inoue, H. Investigating the Mechanisms Underlying the Durability and Sustainable Use of Pb1 Gene-Mediated High Field Resistance to Rice Panicle Blast. Agronomy 2023, 13, 1751. Fujii, K.; Suzuki, T.; Nakamura, M.; Yoshida, T.; Uchikawa, Y.; Suwazono, H.; Hayashi, N.; Kanda, Y.; Inoue, H. Investigating the Mechanisms Underlying the Durability and Sustainable Use of Pb1 Gene-Mediated High Field Resistance to Rice Panicle Blast. Agronomy 2023, 13, 1751.

Abstract

Rice blast, caused by Magnaporthe oryzae, poses significant threat to rice production. Rice blast susceptibility has been observed in Japanese rice varieties with excellent eating quality. Enhancing blast resistance is essential to ensure minimal use of agricultural chemicals. Two types of blast resistance are observed: true resistance, which is a type of qualitative resistance expressed by a major gene, and field resistance, which is a type of quantitative resistance expressed by multiple micro-acting genes. ‘Resistance collapse’, in which a variety with a true resistance gene becomes diseased by blast fungus races compatible with the resistance gene, has been observed. Varieties carrying blast-resistance genes, such as Pb1 (panicle blast resistance 1), have been developed through DNA marker-assisted selection. In this review, we focus on the Pb1, which expresses strong quantitative resistance to panicle blast and has been widely used in Japan without showing ‘resistance collapse’ for 40 years. Pb1 is an ‘adult plant resistance gene’ that does not exert strong selection pressure on the blast population during the leaf blast stage, thus preventing the selective multiplication of Pb1-compatible blast strains. This epidemiological mechanism prevents ‘resistance collapse’. Interdisciplinary research and breeding are required to sustainably use genes that induce high field resistance.

Keywords

Oryza sativa; Magnaporthe oryzae; rice; rice blast; panicle blast; high field resistance; quantitative resistance; major gene; adult plant resistance; durability; sustainable use; sustainable development goals

Subject

Biology and Life Sciences, Agricultural Science and Agronomy

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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