57. Following are some statements for synthesis of jasmonic acid in plants
    A. 12-oxo-phytodienoic acid is produced in chloroplast and transported to peroxisome.
    B. Action of lipoxygenase, alleneoxide synthase and allene oxide cyclase takes place in peroxisome.
    C.12-oxo-phytodicnoic acid is first reduced and then converted to jasmonic acid by 0-oxidation.
    D. Final production of jasmonic acid takes place in chloroplast.
    E.Action of allene oxide synthase and allene oxide cyclase takes place in chloroplast.
    Which one of the following combination of above statements is correct?

(1) A, B and C         (2) B, D andE
(3) C, D and E        (4) A, C and E

Correct answer: (4) A, C and E

Explanation:

• (A) 12-oxo-phytodienoic acid (OPDA) is produced in the chloroplast and then transported to the peroxisome for further processing. This is correct.

• (B) The action of lipoxygenase, allene oxide synthase, and allene oxide cyclase occurs in the chloroplast, not the peroxisome, so statement B is incorrect.

• (C) OPDA is first reduced by oxo-phytodienoate reductase in the peroxisome and then converted to jasmonic acid through β-oxidation. This is correct.

• (D) Final production of jasmonic acid takes place in the peroxisome, not the chloroplast. So statement D is incorrect.

• (E) The action of allene oxide synthase and allene oxide cyclase takes place in the chloroplast, which is correct.

Option-wise:

• (1) A, B and C — B incorrect.

• (2) B, D and E — B and D incorrect.

• (3) C, D and E — D incorrect.

• (4) A, C and E — Correct combination.

  Jasmonic acid synthesis in plants involves a compartmentalized pathway starting in the chloroplast with the production of 12-oxo-phytodienoic acid, followed by transport to the peroxisome where reduction and β-oxidation produce jasmonic acid, essential for defense and development.