NEET2006BotanyAnatomy of Flowering PlantsActual
In the sieve elements, which one of the following is the most likely function of P-proteins ?
Options
- ADeposition of callose on sieve plates
- BProviding energy for active translocation
- CAutolytic enzymes
- DSealing mechanism on wounding
Correct answer
D. Sealing mechanism on wounding
Step-by-step solution
Sieve elements are a component of phloem tissue and are responsible for conduction of food in plants. A sieve tube element has peripheral layer of cytoplasm without any nucleus. The central part is occupied by a network of canals which contain fibrils of p -protein. The protein is vibratite and is believed to actively participate in the transport of nutrients. One general property of its ability to form a gel and it functions as a puncture repair substance forming a plug at any site of damage in sieve element, thus