The genetic control of rice resistance has been extensively studied, but how the resistance mechanism is genetically controlled has received less attention. This study revealed that the rice resistance mechanism toward brown planthopper was genetically controlled by several genes with several mendelian patterns. The tolerance mechanism is controlled by three complementary genes; this is confirmed by QTL analysis, whereas the Antibiosis is controlled by three separate loci on chromosomes 2, 8, and 11. The antixenosis was controlled by polygenic, but detected locus only on chromosome 3, with minor effects.

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• ‘Drimi9ho’, A Lodging Tolerance with Mid-late Maturing, Improved White-backed Planthopper (Sogatella furcifera) and Cultivation Stability
  Jae-Ryoung Park, Eun-Gyeong Kim, Yoon-Hee Jang, Kyung-Min Kim
  Korean Journal of Breeding Science.2025; 57(4): 493.     CrossRef

Hops are dioecious, with only female plants cultivated for resin production and primarily used in brewing. Therefore, early sex identification at the seedling stage is crucial for breeding and cultivation. Molecular marker-assisted selection facilitates rapid and reliable sex identification of hops. We developed molecular male markers by leveraging sequence information from male-specific regions in a designated public database. To assess the accuracy of sex identification using the newly generated markers, we performed PCR analysis on four cultivars of hops with known sexes. Seventy-eight percent of the tested PCR primers correlated with the male sex phenotype. Following optimization, four primer pairs were successfully converted into male-specific PCR markers.

Doubled haploid (DH) technology enables the generation and evaluation of new plant genotypes in ≤ 2 years, which is in stark contrast to the 6-7 years required for conventional breeding. Recently, a few proteins including MATRILINEAL (MTL) were found to trigger haploid induction in monocot plants. However, MTL function in dicot plants remains unclear. Here, we investigate the effects of Arabidopsis PATATIN-RELATED PHOSPHOLIPASE 2A (pPLA-IIa), a maize MTL homolog, on the expression of genes that modulate pollen development and fertilization in Arabidopsis. Quantitative real-time PCR analysis showed that transcript levels of four pollen tube growth-related genes and six pollen guidance- or reception-related genes were increased in the ppla-iia T-DNA insertion mutant compared with the wild type. In addition, transcript levels of four mitosis- and meiosis-related genes, two hormone-related genes, and a calcium pump-encoding gene were also upregulated in the ppla-iia mutant, whereas expression levels of genes encoding a synergid-secreted peptide (AtLURE1.1) and calmodulin-activated Ca^2＋-ATPase ion pump 9 (ACA9) protein were downregulated in the ppla-iia mutant compared with the wild type. Taken together, these results suggest that AtLURE1.1 and ACA9 play positive roles in pPLA-IIa-mediated fertilization. Thus, pPLA-IIa controls fertilization through the modulation of pollen germination and pollen tube growth and guidance in Arabidopsis.