In the sieve elements, which one of the following is the most likely function of P-protein-
(a) Autolytic enzymes
(b) Sealing mechanism on wounding
(c) Providing energy of active translocation
(d) Deposition of callose on sieve plates

Options

A. deposition of callose on sieve plates
B. providing energy for active transloction
C. autolytic enzymes
D. sealing mechanism on wounding

Answer

d

Explanation

Sieve elements are a component of phloem tissue and sare responsible for conduction of food in plants. A sieve tube elements has peripheral layer of cytoplasm without any nucleus. The central part is occupied by a network of canals which contain fibrits of p-protein partcipitate in the transport of nutreients. One general property of its ability to form a gel and it function as a puncture tepair substance forming a plug at any site of damage in sieve elements, thus preventing loss of food materials being translocated by the pholem. Thus it is believed to have sealing function on wounding.