Symplasmic phloem unloading and radial post-phloem transport via vascular rays in tuberous roots of Manihot esculenta.

ABSTRACT: Cassava (Manihot esculenta) is one of the most important staple food crops worldwide. Its starchy tuberous roots supply over 800 million people with carbohydrates. Yet, surprisingly little is known about the processes involved in filling of those vital storage organs. A better understanding of cassava carbohydrate allocation and starch storage is key to improving storage root yield. Here, we studied cassava morphology and phloem sap flow from source to sink using transgenic pAtSUC2::GFP plants, the phloem tracers esculin and 5(6)-carboxyfluorescein diacetate, as well as several staining techniques. We show that cassava performs apoplasmic phloem loading in source leaves and symplasmic unloading into phloem parenchyma cells of tuberous roots. We demonstrate that vascular rays play an import

SUBMITTER: Mehdi R 

PROVIDER: S-EPMC6812707 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature