Triyaningsih

Fakultas Biologi, Universitas Gadjah Mada, Indonesia

Tri Rini Nuringtyas

Fakultas Biologi, Universitas Gadjah Mada, Indonesia

Pusat Studi Bioteknologi, Universitas Gadjah Mada, Indonesia

Yekti Asih Purwestri

Fakultas Biologi, Universitas Gadjah Mada, Indonesia

Pusat Studi Bioteknologi, Universitas Gadjah Mada, Indonesia

Alfino Sebastian

Pusat Studi Bioteknologi, Universitas Gadjah Mada, Indonesia

DOI: https://doi.org/10.19184/jid.v23i1.24181

ABSTRACT 

Plant pathogens constrain the development of black rice farming. One of these pathogens is Xanthomonas oryzae pv. oryzae (Xoo), causing a bacterial leaf blight disease. The disease disrupts crop growth and reducing yields. Cempo ireng is a local pigmented rice cultivar from Yogyakarta, Indonesia, which is reported for its high resistance to Xoo. One of the rice resistance mechanisms to Xoo infection is a molecular defense employing plant resistance genes such as WRKY45. Comparing the expression of resistance-related genes of the resistant cultivar to the susceptible ones is needed to elucidate the resistance mechanism of the black rice to Xoo. For this purpose, the expression of WRKY45 gene at the level of mRNA can be performed using qRT-PCR. The success of qPCR analysis is greatly influenced by the accuracy of the annealing primer temperature of the corresponding gene. This study aimed to optimize the primer's annealing temperature for WRKY45 gene. The optimization was done by a temperature gradient PCR. Determination of the optimal annealing temperature was selected based on the profile of the amplification curve, melt curve, melt temperature and the Ct value obtained. The annealing temperature gradient used in this study was ranging from 52°C to 60°C. The results showed that the best annealing temperature for WRKY45 gene primers is 58.3°C based on the amplification curve, melt curve, melt peak and Ct value of 29.21.

Keywords: Xoo, Cempo ireng, qRT-PCR, primer optimization, annealing temperature.