Volume 26, No 3, Mar 2016
ISSN: 1001-0602
EISSN: 1748-7838 2018
impact factor 17.848*
(Clarivate Analytics, 2019)
Volume 26 Issue 3, March 2016: 384-388 | Open Access
LETTERS TO THE EDITOR
NF-YB1-regulated expression of sucrose transporters in aleurone facilitates sugar loading to rice endosperm
Ai-Ning Bai1,2, Xiao-Duo Lu1, Dong-Qi Li1,2, Jin-Xin Liu1 and Chun-Ming Liu1
1Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Nanxincun 20, Fragrant Hill, Beijing 100093, China
2University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
Correspondence: Chun-Ming Liu, Tel: 86-010-6283-6663(cmliu@ibcas.ac.cn)
Cereal endosperms, which consist of an outer aleurone layer and an inner starchy endosperm, provide over 70% staple food for human [www.fao.org]. Rice endosperm development occurs in the caryopsis of a grain. During the grain filling stage, sucrose produced in photosynthetic leaves is transported to grains via the phloem1,2. It has been proposed that sucrose, upon arrival in the caryopsis through the phloem located at the dorsal vascular bundle, is partially hydrolyzed by cell wall invertases (CINs) into glucose and fructose3,4. Since endosperm is symplastically isolated from maternal tissues, it is assumed that these sugars are delivered to the endosperm actively through an apoplastic pathway by sugar transporters located in aleurone5,6. However, the exact role of aleurone in regulating sugar transport remains unknown.
10.1038/cr.2015.116
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