SWEET11 and 15 as key players in seed filling in rice

Yang, Jungil; Luo, Dangping; Yang, Bing; Frommer, Wolf B.; Eom, Joon -Seob

doi:10.1111/nph.15004

Title: SWEET11 and 15 as key players in seed filling in rice

Journal Article · 02 February 2018 · New Phytologist

DOI: https://doi.org/10.1111/nph.15004 · OSTI ID:1419360

Yang, Jungil ^[1]; Luo, Dangping ^[2]; Yang, Bing ^[2]; Frommer, Wolf B. ^[3]; Eom, Joon -Seob ^[1]

Heinrich‐Heine Univ. Duesseldorf, Duesseldorf (Germany); Max Planck Inst. of Plant Breeding Research, Cologne (Germany); Carnegie Inst. for Science, Stanford, CA (United States)
Iowa State Univ., Ames, IA (United States)
Heinrich‐Heine Univ. Duesseldorf, Duesseldorf (Germany); Max Planck Inst. of Plant Breeding Research, Cologne (Germany); Carnegie Inst. for Science, Stanford, CA (United States); Nagoya Univ., Aichi (Japan)

Despite the relevance of seed-filling mechanisms for crop yield, we still have only a rudimentary understanding of the transport processes that supply the caryopsis with sugars. Here, we hypothesized that SWEET sucrose transporters may play important roles in nutrient import pathways in the rice caryopsis. We used a combination of mRNA quantification, histochemical analyses, translational promoter–reporter fusions and analysis of knockout mutants created by genomic editing to evaluate the contribution of SWEET transporters to seed filling. In rice caryopses, SWEET11 and 15 had the highest mRNA levels and proteins localized to four key sites: all regions of the nucellus at early stages; the nucellar projection close to the dorsal vein; the nucellar epidermis that surrounds the endosperm; and the aleurone. ossweet11;15 double knockout lines accumulated starch in the pericarp, whereas caryopses did not contain a functional endosperm. Jointly, SWEET11 and 15 show all the hallmarks of being necessary for seed filling with sucrose efflux functions at the nucellar projection and a role in transfer across the nucellar epidermis/aleurone interface, delineating two major steps for apoplasmic seed filling, observations that are discussed in relation to observations made in rice and barley regarding the relative prevalence of these two potential import routes.

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Research Organization:: Carnegie Inst. of Washington, Washington, DC (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER15542; DE‐FG02‐04ER15542

OSTI ID:: 1419360

Alternate ID(s):: OSTI ID: 1419361; OSTI ID: 1500104

Journal Information:: New Phytologist, Vol. 218, Issue 2; ISSN 0028-646X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 163 works

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