Question
Biology Question on Anatomy of Flowering Plants
In the sieve elements, which one of the following is the most likely function of P-proteins ?
A
deposition of callose on sieve plates
B
providing energy for active translocation
C
autolytic enzymes
D
sealing mechanism on wounding
Answer
sealing mechanism on wounding
Explanation
Solution
In most angiospermic plants, sieve tube-elements of phloem, are P-protein, later is found in all dicots and in many monocots but it is absent in gymnosperms and cryptogams. The main function of P-protein is in sealing off damaged sieve elements by plugging up sieve plate pores.