NDLI: Physiological and transcriptional analysis reveals pathways involved in iron deficiency chlorosis in fragrant citrus

Content Provider	Springer Nature Link
Author	Jin, Long Fei Liu, Yong Zhong Du, Wei Fu, Li Na Hussain, Syed Bilal Peng, Shu Ang
Copyright Year	2017
Abstract	Iron (Fe) deficiency chlorosis is a yield-limiting problem in citrus production regions with calcareous soils. Physiological and transcriptional analyses of fragrant citrus (Citrus junos Sieb. ex Tanaka) leaves from Fe-sufficient (IS) and Fe-deficient (ID) plants were investigated in this study. The physiological results showed that Fe, potassium, and nitrogen levels decreased by 12, 15, and 41% in ID leaves, respectively. However, zinc and copper levels increased by 49 and 35% in ID leaves, respectively. The chlorophyll (Chl) content, photosynthesis rate, stomatal conductance, and transpiration rate in ID leaves decreased by 55, 33, 38, and 42%, respectively, compared with IS leaves. Moreover, transcriptional profiling analysis showed that genes associated with Chl metabolism, photosynthesis, and nitrogen metabolism were dramatically downregulated by Fe deficiency. The expression of glutamyl-tRNA reductase 1, chlorophyll(ide) b reductase, and geranylgeranyl diphosphate reductase in ID leaves was 0.26–0.37 times that in IS leaves. The expression levels of 16 photosynthesis-related genes were severely downregulated by Fe deficiency. In addition, the transcription levels of nitrate transporter, nitrate reductase, and ferredoxin-nitrite reductase genes in ID leaves were 0.38–0.45 times those in IS leaves. Taken together, these results indicated that the block of Chl biosynthesis, the reduction of photosynthesis, and the repression of nitrogen absorption resulted in the chlorosis symptoms observed in fragrant citrus leaves.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	16142942
Journal	Tree Genetics & Genomes
Volume Number	13
Issue Number	3
e-ISSN	16142950
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-04-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fragrant citrus Iron deficiency chlorosis Chlorophyll Photosynthesis Nitrogen metabolism Forestry Plant Genetics & Genomics Plant Breeding/Biotechnology Tree Biology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Genetics Molecular Biology Horticulture Forestry

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