Preliminary agronomic characterization of japonica rice carrying a tiller number mutation under greenhouse conditions

Authors:
  • EWElly Daru Ika Wilujeng
    Elly Daru Ika Wilujeng
  • MAMahindra Dewi Nur Aisyah
    Mahindra Dewi Nur Aisyah
  • TATrisnani Alif
    Trisnani Alif
  • AGAndarula Galushasti
    Andarula Galushasti
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Abstract
The global food security demands an increase in rice production. One of the approaches for improving rice production is through genetic engineering. This study explored the potential of genetic engineering for rice yield improvement by modifying Grassy tiller 1 (OsGT1) gene, a tillering controlling gene. By modulating its expression, rice varieties with an increased (OX) and decreased (Ri) expression of GT1 genes were successfully generated. In this work, a growth characterization experiment was conducted in greenhouse exposed to natural light and additional light exposure for 4 h. The study observed the height of the plant, the length of panicle, number of panicles, number of tillers, and grain weight. The observations indicated that OX lines exhibited significant suppression in tiller number, which might potentially allocate maximum photosynthate to grain production. In contrast, the Ri lines exhibited an increased number of tillers. Moreover, the weight of 1000 grain was significantly lower in Ri plants compared to OX and wild type plants. Although the current findings indicate the potential of GT1 modification to enhance rice productivity, additional research is required to convert these results into a comprehensive increase in rice yield. Comprehending the intricate linkages between GT1 and its vital role in influencing agronomic phenotypes and performances can illustrate how the manipulation of tiller-controlling genes substantially impacts rice productivity.

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