NDLI: The APX4 locus regulates seed vigor and seedling growth in Arabidopsis thaliana

Content Provider	Springer Nature Link
Author	Wang, Ya Ying Hecker, Amanda G. Hauser, Bernard A.
Copyright Year	2014
Abstract	The amino acid sequence of APX4 is similar to other ascorbate peroxidases (APXs), a group of proteins that protect plants from oxidative damage by transferring electrons from ascorbate to detoxify peroxides. In this study, we characterized two apx4 mutant alleles. Translational fusions with GFP indicated APX4 localizes to chloroplasts. Both apx4 mutant alleles formed chlorotic cotyledons with significantly reduced chlorophyll a, chlorophyll b and lutein. Given the homology of APX to ROS-scavenging proteins, this result is consistent with APX4 protecting seedling photosystems from oxidation. The growth of apx4 seedlings was stunted early in seedling development. In addition, APX4 altered seed quality by affecting seed coat formation. While apx4 seed development appeared normal, the seed coat was darker and more permeable than the wild type. In addition, accelerated aging tests showed that apx4 seeds were more sensitive to environmental stress than the wild-type seeds. If APX4 affects seed pigment biosynthesis or reduction, the seed coat color and permeability phenotypes are explained. apx4 mutants had cotyledon chlorosis, increased H2O2 accumulation, and reduced soluble APX activity in seedlings. These results indicate that APX4 is involved in the ROS-scavenging process in chloroplasts.
Starting Page	909
Ending Page	919
Page Count	11
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	239
Issue Number	4
e-ISSN	14322048
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-10
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arabidopsis Ascorbate peroxidase Chlorosis Cotyledon Germination Reactive oxygen scavenger Plant Sciences Agriculture Ecology Forestry
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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