The first peptide to be produced after wounding in the tomato plant is ________.
Systemin
Systemin is correct.
Systemin is an 18-amino-acid peptide hormone discovered in tomato leaves in 1991. It was the first peptide hormone identified in plants. When a tomato plant is wounded, for example by a chewing insect, systemin is released from its precursor prosystemin and acts as the first signal of the wound response.
Systemin triggers the jasmonic acid pathway, which leads to the production of proteinase inhibitors throughout the plant that make the leaves hard for insects to digest.
Ricin is a toxic protein of castor seeds, not a tomato wound signal. Jasmonic acid is a lipid-derived hormone produced downstream of systemin, not a peptide. Salicylic acid is a phenolic hormone mainly involved in defence against pathogens, not a peptide either.
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Important Questions from Botany
Which of the following is a type of nutrition?
I. Heterotrophic
II. Autotrophic
Which of the following does NOT form an essential part of the process of photosynthesis?
Part of N 2cycle that is opposed to N 2fixation is:
Which among the following is the reproductive part of a plant?
Fibres (Adventitious) roots are found in :
