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Question
Tungro disease of rice is caused by a
Tungro disease of rice is caused by a
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Solution
The correct option is D Virus
Rice tungro bacilliform virus (RTBV) is a plant para retrovirus of the family Caulimoviridae. Tungro means 'degenerated growth' and was first observed in Philippines. Tungro affected rice plants are stunted and have reduced number of tillers. The young emerging leaves develop interveinal chlorosis leading to discolouration of the leaves, starting from tip downwards. Often whole leaf is discoloured, plants infected at an early stage generally die prematurely. Infected plants take more time for maturity because of delayed flowering. The panicles are often poorly developed and the grains are also often covered with dark brown blotches and are lighter than those of healthy plants. So, tungro disease in rice caused by virus and not by Mycoplasma and prions. Thus, the correct answer is option D.
Rice tungro bacilliform virus (RTBV) is a plant para retrovirus of the family Caulimoviridae. Tungro means 'degenerated growth' and was first observed in Philippines. Tungro affected rice plants are stunted and have reduced number of tillers. The young emerging leaves develop interveinal chlorosis leading to discolouration of the leaves, starting from tip downwards. Often whole leaf is discoloured, plants infected at an early stage generally die prematurely. Infected plants take more time for maturity because of delayed flowering. The panicles are often poorly developed and the grains are also often covered with dark brown blotches and are lighter than those of healthy plants. So, tungro disease in rice caused by virus and not by Mycoplasma and prions. Thus, the correct answer is option D.
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