The Transport Phloem. Specifics of its Functioning

摘要: Translocation of photoassimilates from the source leaves to heterotrophic parts plant demands three different functions executed by phloem system. The photosynthate is collected in (phloem loading), translocated sink transport), and delivered tissues unloading). It expected that anatomy physiology particular sections reflect specific tasks be carried out. Investigations over past 10 years revealed a diversity anatomical settings sources sinks which seem correspond with multiplicity mechanisms. Several reviews opinion papers were recently devoted engaged loading (Delrot 1987; Van Bel 1987, 1989, 1992; Gamalei 1990, 1991; Turgeon 1989; Beebe 1991) unloading (Murray Patrick 1990; Oparka Wolswinkel 1990). functioning transport has gained much less attention, although some silent conceptual progress been made decade. Only aspects such as (Patrick 1990) relation between solute transfer through rays (Van have reviewed recently.