当前位置： SCI文献检索 > JOURNAL OF EXPERIMENTAL BOTANY期刊下所有文献 > Cell type-specific gene expression underpins remodelling of cell wall pectin in exocarp and cortex during apple fruit development.

Cell type-specific gene expression underpins remodelling of cell wall pectin in exocarp and cortex during apple fruit development.

Abstract：

:In apple (Malus×domestica) fruit, the different layers of the exocarp (cuticle, epidermis, and hypodermis) protect and maintain fruit integrity, and resist the turgor-driven expansion of the underlying thin-walled cortical cells during growth. Using in situ immunolocalization and size exclusion epitope detection chromatography, distinct cell type differences in cell wall composition in the exocarp were revealed during apple fruit development. Epidermal cell walls lacked pectic (1→4)-β-d-galactan (associated with rigidity), whereas linear (1→5)-α-l-arabinan (associated with flexibility) was exclusively present in the epidermal cell walls in expanding fruit and then appeared in all cell types during ripening. Branched (1→5)-α-l-arabinan was uniformly distributed between cell types. Laser capture microdissection and RNA sequencing (RNA-seq) were used to explore transcriptomic differences controlling cell type-specific wall modification. The RNA-seq data indicate that the control of cell wall composition is achieved through cell-specific gene expression of hydrolases. In epidermal cells, this results in the degradation of galactan side chains by possibly five β-galactosidases (BGAL2, BGAL7, BGAL10, BGAL11, and BGAL103) and debranching of arabinans by α-arabinofuranosidases AF1 and AF2. Together, these results demonstrate that flexibility and rigidity of the different cell layers in apple fruit during development and ripening are determined, at least in part, by the control of cell wall pectin remodelling.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Collins PP,O'donoghue EM,Rebstock R,Tiffin HR,Sutherland PW,Schröder R,McAtee PA,Prakash R,Ireland HS,Johnston JW,Atkinson RG,Schaffer RJ,Hallett IC,Brummell DA

doi

10.1093/jxb/erz370

subject

Has Abstract

pub_date

2019-11-18 00:00:00

pages

6085-6099

issue

21

eissn

0022-0957

issn

1460-2431

pii

5549407

journal_volume

70

pub_type

杂志文章

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