NDLI: Abscisic acid enhances starch degradation and sugar transport in rice upper leaf sheaths at the post-heading stage

Content Provider	Springer Nature Link
Author	Chen, Huai Ju Wang, Shu Jen
Copyright Year	2012
Abstract	Leaf sheaths of higher position leaves (upper leaf sheaths) on rice (Oryza sativa L.) stems function as temporary starch storage organs at the pre-heading stage. Starch is quickly accumulated in upper leaf sheaths before heading, but the storage starch is degraded at the post-heading stage to provide the carbon source for developing grains. Abscisic acid (ABA) is a key plant hormone to control plant development and stress responses. This study found that ABA content in upper leaf sheaths was significantly increased at the stage after panicle exsertion and that the pattern of ABA increase was negatively correlated with changes in starch content. Exogenous ABA reduced starch content in leaf sheaths while the activities of starch degradation enzymes (i.e., α-amylase/EC 3.2.1.1, β-amylase/EC 3.2.1.2) increased in ABA-treated leaf sheaths and sucrose transporter gene expression was up-regulated. However, ABA repressed the activities of some starch biosynthesis enzymes (i.e., ADP-glucose pyrophosphorylase/EC 2.7.7.27, granule-bound starch synthase/EC 2.4.1.11) in leaf sheaths. These results suggest that ABA plays an important role in promoting starch degradation and sucrose remobilization in upper leaf sheaths at the post-heading stage.
Starting Page	1493
Ending Page	1500
Page Count	8
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	34
Issue Number	4
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-02-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Abscisic acid Oryza sativa Leaf sheath Starch Sucrose transporter Temporary storage organ Plant Physiology Plant Anatomy/Development Agriculture Plant Genetics & Genomics Plant Pathology Plant Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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