In pursuit of the heteroxyly hypothesis: Sharing tasks between xylem tissues for performance implementation
Speaker: Aritsara Amy Ny Aina (College of Forestry, Guangxi University, China)
Date/Time: Tue, 12 Nov 2019, 4 pm
Venue: DBS Conference Room 1 (Block S3 Level 5)
Growing skywards implies that trees have to deal with different kinds of constraints: mechanical support, water transport, resource storage, etc. The heteroxyly hypothesis states that sharing those functions among specialized tissues is more efficient than multifunctional tissues. My study mainly focuses on xylem parenchyma and its contribution to plant hydraulic safety and efficiency. In palms, the ground parenchyma, with its high storage capacity, is vital for the plant to escape from the constraints due to the theoretical vessel tapering and to optimize their water transport efficiency. In basal angiosperms, the axial parenchyma has been believed to hold space and to use large amounts of resources for maintenance, hence trading-off with hydraulic efficiency and safety. However, our findings suggest that it coordinates with the optimization of water transport. In the new era of changing climates, would a xylem with more parenchyma tissue guarantee higher survivorship against environmental stochasticity?
All are welcome.