NDLI: Drought response in the spikes of barley: gene expression in the lemma, palea, awn, and seed

Content Provider	Springer Nature Link
Author	Abebe, Tilahun Melmaiee, Kalpalatha Berg, Virginia Wise, Roger P.
Copyright Year	2009
Abstract	The photosynthetic organs of the barley spike (lemma, palea, and awn) are considered resistant to drought. However, there is little information about gene expression in the spike organs under drought conditions. We compared response of the transcriptome of the lemma, palea, awn, and seed to drought stress using the Barley1 Genome Array. Barley plants were exposed to drought treatment for 4 days at the grain-filling stage by withholding water. At the end of the stress, relative water content of the lemma, palea, and awn dropped from 85% to 60%. Nevertheless, the water content of the seed only decreased from 89% to 81%. Transcript abundance followed the water status of the spike organs; the awn had more drought-regulated genes followed by lemma and palea, and the seed showed very little change in gene expression. Despite expressing more drought-associated genes, many genes for amino acid, amino acid derivative, and carbohydrate metabolism, as well as for photosynthesis, respiration, and stress response, were down-regulated in the awn compared with the lemma, palea, and seed. This suggests that the lemma and the palea are more resistant to drought stress compared with the awn.
Starting Page	191
Ending Page	205
Page Count	15
File Format	PDF
ISSN	1438793X
Journal	Functional & Integrative Genomics
Volume Number	10
Issue Number	2
e-ISSN	14387948
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-11-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Awn Drought Lemma Palea Seed Transcriptome Animal Genetics and Genomics Bioinformatics Biochemistry Microbial Genetics and Genomics Cell Biology Plant Genetics & Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine

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