Japonica Rice

Japonica Rice: Recently, in a landmark step towards sustainable agriculture, scientists at the National Institute of Plant Genome Research (NIPGR) in Delhi successfully used CRISPR-Cas9 technology to genetically edit japonica rice. This will enhance its ability to absorb and transport phosphate—one of the key nutrient limitations in Indian soils.

o The gene-edited rice lines showed up to 20% higher yields under normal phosphate application, and up to 40% yield boost even when just 10% of recommended phosphate fertilizer was used.

• About japonica rice (Oryza sativa japonica) : One of the two main types of Asian rice (other type is Indica rice). It originally came from northern and eastern China and is now grown in many Asian countries.

o Characteristics : The grains are short to medium in size and don't break or fall off easily.

- They are thicker, harder, and stickier than regular white rice.

- They have low to medium starch (amylose) content—between 0% and 20%.

o Famous Varieties: Some popular types are sushi rice and glutinous rice. (Glutinous rice is sticky but gluten-free.)

o Best Climate for Growing: It grows well in cooler parts of subtropical and temperate areas.

o Mostly Grown : Japan, China, Korea, Vietnam, and Indonesia.

• About CRISPR : Stands for Clustered Regularly Interspaced Short Palindromic Repeats and Cas9 refers to the associated protein 9.

o A powerful genome editing tool that allows scientists to precisely alter DNA sequences at specific locations in the genome.

o How It Works: Functions like a cut-and-paste mechanism on DNA strands.

- The targeted genetic code is identified.

- The Cas9 protein acts as a molecular scissor to cut the DNA at the desired location.

- This enables insertion, deletion, or modification of genes.

• Applications: Gene editing in embryos & treatment of genetic disorders like sickle cell disease.

  - Modifying crop genes to improve yield, resilience, and nutrient use efficiency.

  - Creating models to study diseases and test new drugs.

  • Significance: Offers a precise, efficient, and cost-effective method for genetic engineering with vast implications for medicine, agriculture, and biotechnology.