Question

Discovery of gibberellin is related to
A. Blast disease of rice
B. Early blight of potato
C. Bakanae disease of rice.
D. Rust of wheat.

Answer 1

Hint:-The signaling molecules, which are synthesized in very small quantities by the plant cells that are involved in the growth and biological activities of the plants are known as plant hormones. Plant hormones are categorized into major five groups. These are abscisic acid, cytokinins, auxins, ethylene, and gibberellin.

Complete answer:
Blast disease of rice is caused by a fungus called Magnaporthe grisea. Symptoms of the blast disease of rice include grey-green or white spots or lesions on all parts of the plant. The fungus, named Alternaria solani, causes the Early blight of potato. In the early stage of infection, leaves possess small, irregular, or circular black or brown spots. Symptoms appear within 2-3 days of infection.In Bakanae disease, a fungus called Gibberella fujikuroi produces a compound that resembles gibberellin. Due to the compound abnormal elongation of the seedlings of the rice occurs. This disease may cause death in severe cases.Rust disease of wheat is also caused by a fungus, named Puccinia triticina. This infection is most severe in the winter season. The symptoms of this disease include the appearance of tiny brown pustules randomly on the blades of the leaves. Bakanae disease of rice.

Additional information: Gibberellin is found in gymnosperm, angiosperms, algae, mosses, and fungi. Gibberellin is involved in cell division and cell and shoots elongation of the plant. Gibberellin is also responsible for the germination of seeds by breaking down the dormancy of the seeds. Gibberellin has a very minimal effect on roots.

So, the correct answer is option C.

Note:- Gibberellin is discovered by a scientist named Kurosawa. Kurosawa was a Japanese scientist. The discovery of gibberellin occurred by investing in a rice disease called rice foolish seedling disease. This disease is also known as Bakanae disease of rice. The symptoms of this disease appear after a month of planting.