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Molecular bases for differential aging programs between flag and second leaves during grain-filling in rice

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Title
Molecular bases for differential aging programs between flag and second leaves during grain-filling in rice
Author(s)
Shinyoung Lee; Hyobin Jeong; Sichul Lee; Jinwon Lee; Sun-Ji Kim; Ji-Won Park; Hye Ryun Woo; Pyung Ok Lim; Gynheung An; Hong Gil Nam; Daehee Hwang
Publication Date
2017-08
Journal
SCIENTIFIC REPORTS, v.7, no.1, pp.8792 -
Publisher
NATURE PUBLISHING GROUP
Abstract
Flag leaves (FL) and second leaves (SL) in rice show differential aging patterns during monocarpic senescence. Coordination of aging programs between FL and SL is important for grain yield and quality. However, the molecular bases for differential aging programs between FL and SL have not been systematically explored in rice. Here, we performed mRNA-sequencing of FL and SL at six time points during grain-filling and identified four molecular bases for differential aging programs between FL and SL: phenylpropanoid biosynthesis, photosynthesis, amino acid (AA) transport, and hormone response. Of them, photosynthesis (carbon assimilation) and AA transport (nitrogen remobilization) predominantly occurred in FL and SL, respectively, during grain-filling. Unlike other molecular bases, AA transport showed consistent differential expression patterns between FL and SL in independent samples. Moreover, long-distance AA transporters showed invariant differential expression patterns between FL and SL after panicle removal, which was consistent to invariant differential nitrogen contents between FL and SL after panicle removal. Therefore, our results suggest that the supplies of carbon and nitrogen to seeds is functionally segregated between FL and SL and that long-distance AA transport is an invariant core program for high nitrogen remobilization in SL. © The Author(s) 2017
URI
http://pr.ibs.re.kr/handle/8788114/3876
DOI
10.1038/s41598-017-07035-9
ISSN
2045-2322
Appears in Collections:
Center for Plant Aging Research (식물 노화·수명 연구단) > Journal Papers (저널논문)
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