Xiaoyan Cheng, Guohua Zhou, Wei Chen, Lin Tan, Qishi Long, Fusheng Cui, Lei Tan, Guoxing Zou & Yong Tan

Theoretical and Applied Genetics; 10 September 2024; vol 137; article 219

In the past century, there have been great achievements in identifying resistance (R) genes and quantitative trait loci (QTLs) as well as revealing the corresponding molecular mechanisms for resistance in rice to major diseases and insect pests. The introgression of R genes to develop resistant rice cultivars has become the most effective and eco-friendly method to control pathogens/insects at present. However, little attention has been paid to durable and broad-spectrum resistance, which determines the real applicability of R genes. Here, we summarize all the R genes and QTLs conferring durable and broad-spectrum resistance in rice to fungal blast, bacterial leaf blight (BLB), and the brown planthopper (BPH) in molecular breeding. We discuss the molecular mechanisms and feasible methods of improving durable and broad-spectrum resistance to blast, BLB, and BPH. We will particularly focus on pyramiding multiple R genes or QTLs as the most useful method to improve durability and broaden the disease/insect spectrum in practical breeding regardless of its uncertainty. We believe that this review provides useful information for scientists and breeders in rice breeding for multiple stress resistance in the future.

See https://link.springer.com/article/10.1007/s00122-024-04729-3

Table 1: Identified R genes and QTLs in rice conferring broad-spectrum and durable resistance to fungal blast, bacterial leaf blight (BLB), and brown planthopper (BPH)