• Wednesday, Dec 01, 2021
  • Last Update : 05:34 pm

Japanese scientists develop salt-resistant rice variety for ocean farming

  • Published at 06:40 pm September 21st, 2020
A farmer drives a combine harvester to harvest the rice in a paddy field field surrounding the City of Toyota Stadium in Toyota City on September 27, 2019 AFP

Less than 1% of fresh water is available for human use, and 70% of that is used for agriculture worldwide

Growing rice in the salty water sounds a little whacky, but salt-resistant agriculture is an emerging form of food production that could have some real potential.

Less than 1% of fresh water is available for human use, and 70% of that is used for agriculture worldwide. 

Increased demand for food and exploding population levels are pushing innovators to explore areas where agriculture has never gone before. One crop taking to the sea is rice. 

A Japan-based team of biology scientists has developed a new rice variety through genetic improvement in an attempt to increase crop yields in a salty paddy field, The Japan Times reported.

The team, led by the National Agriculture and Food Research Organization, has said it succeeded in finding a gene that determines the angle of root growth, hoping the discovery will lead to more new rice varieties amid the growing risk of salt damage as a result of frequent high tides and typhoons due to global warming.

Salt damage is predicted to affect about half the world’s existing arable land by 2050, with coastal areas in Japan and some other countries, including Bangladesh and Vietnam, already facing challenges, according to the team.

“By using this gene it may be possible to design how rice roots grow to suit farmland conditions,” said Yusaku Uga, a principal scientist at the organization.

The gene was found in one type of Indonesian rice, whose roots grow along the surface of the ground.

Just as in a drought, soil with high levels of salinity prevents plants from taking in water. Moreover, the soil becomes too firm, making them depleted of oxygen.

Presuming that rice would also be more resilient if its roots can grow along the surface of the soil, the team spent four years from 2015 monitoring how the Japanese rice Sasanishiki crossbred with the Indonesian variety produces grains in a salty paddy field, compared to ordinary Sasanishiki.

The scientists said the genetically improved rice saw a 15% increase in harvest in salty water. Meanwhile, it showed no difference in growth performance in a normal paddy field.

Shallower roots are also said to be advantageous for plants to take in phosphorus, an essential nutrient, suggesting the method could be beneficial for farmers in poverty-stricken countries and regions where fertilizers are not easily available, Uga said.

The 45-year-old scientist said the findings hold promise for other crops including corn and soybeans as they have similar genes that determine the angle of root growth.

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