Recent Advances in Gene Mining and Hormonal Mechanism for Brown Planthopper Resistance in Rice

Area of Science:

• Plant genetics and molecular biology
• Agricultural science
• Crop protection

Background:

• Rice (Oryza sativa L.) is a global staple food crop.
• Brown planthopper (BPH, Nilaparvata lugens Stål) causes significant annual yield losses in rice.
• Host resistance is the most effective strategy for BPH control.

Purpose of the Study:

• To review recent advances in identifying and characterizing BPH resistance genes in rice.
• To elucidate the molecular and biochemical mechanisms underlying rice resistance to BPH.
• To summarize the role of phytohormones in rice immunity against BPH.

Main Methods:

• Genetic mapping and quantitative trait loci (QTL) analysis.
• Gene cloning and functional characterization.
• Analysis of plant hormone signaling pathways involved in defense.

Main Results:

• Over 70 BPH resistance genes/QTLs have been identified.
• 17 resistance genes cloned, encoding CC-NB-LRR, LecRK, and other proteins.
• Multiple defense mechanisms identified, including phytohormones (JA, SA, ET, ABA, GAs, CKs, BRs, IAA).

Conclusions:

• Significant progress has been made in understanding rice BPH resistance genetics and mechanisms.
• Phytohormone crosstalk is crucial for effective rice defense against BPH.
• Further research is needed to develop durable BPH resistance in rice varieties.