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Midrib Sucrose Accumulation and Sugar Transporter Gene Expression in YCS-Affected Sugarcane Leaves

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Abstract

Sucrose accumulation and decreased photosynthesis are early symptoms of yellow canopy syndrome (YCS) in sugarcane (Saccharum spp.), and precede the visual yellowing of the leaves. To investigate broad-scale gene expression changes during YCS-onset, transcriptome analyses coupled to metabolome analyses were performed. Across leaf tissues, the greatest number of differentially expressed genes related to the chloroplast, and the metabolic processes relating to nitrogen and carbohydrates. Five genes represented 90% of the TPM (Transcripts Per Million) associated with the downregulation of transcription during YCS-onset, which included PSII D1 (PsbA). This differential expression was consistent with a feedback regulatory effect upon photosynthesis. Broad-scale gene expression analyses did not reveal a cause for leaf sugar accumulation during YCS-onset. Interestingly, the midrib showed the greatest accumulation of sugars, followed by symptomatic lamina. To investigate if phloem loading/reloading may be compromised on a gene expression level – to lead to leaf sucrose accumulation - sucrose transport-related proteins of SWEETs, Sucrose Transporters (SUTs), H+-ATPases and H+-pyrophosphatases (H+-PPases) were characterised from a sugarcane transcriptome and expression analysed. Two clusters of Type I H+-PPases, with one upregulated and the other downregulated, were evident. Although less pronounced, a similar pattern of change was observed for the H+-ATPases. The disaccharide transporting SWEETs were downregulated after visual symptoms were present, and a monosaccharide transporting SWEET upregulated preceding, as well as after, symptom development. SUT gene expression was the least responsive to YCS development. The results are consistent with a reduction of photoassimilate movement through the phloem leading to sucrose build-up in the leaf.

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Data Availability

Raw sequence reads generated from sugarcane leaf material in this study were deposited at National Center for Biotechnology Information (NCBI) Sequence Reads Archive under the BioProject PRJNA474042.

Abbreviations

AA:

Amino Acid

BS:

Bundle-Sheath

CC:

Companion Cell

DEG:

Differentially Expressed Gene

ES:

Early-Stage YCS-affected lamina

GABA:

4-aminobutyric acid

GO:

Gene Ontology

H+-PPase:

H+-pyrophosphatase

LS:

Late-Stage YCS-affected lamina

M:

Mesophyll

ORF:

Open-Reading Frame

Pi:

Inorganic Phosphate

pmf :

Proton Motive Force

PPi:

Inorganic Pyrophosphate

PSI:

Photosystem I

PSII:

Photosystem II

ScYLV:

Sugarcane Yellow Leaf Virus

ScYP:

Sugarcane yellow leaf phytoplasma

SE:

Sieve Element

SUS:

Sucrose Synthase

SUT:

Sucrose-H+ symporter sugar transporter

SWEET:

Sugar will eventually be exported transporter

TPM:

Transcripts Per Million

VP:

Vascular Parenchyma

YCS:

Yellow Canopy Syndrome

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Acknowledgements

We are thankful for financial support from Sugar Research Australia and the Queensland Government Department of Agriculture and Fisheries. Sincere thanks to Gerard Scalia and Kate Wathen-Dunn for pivotal roles during sample collection and general support. We also thank Davey Olsen for assistance identifying sampling sites, and Ian Shepherdson of Home Hill, Queensland for access to sampled material. Further we acknowledge technical support from Rosa Shafiei and Dr. Rafael Tavares.

Funding

This work was funded by Sugar Research Australia Limited, and the Queensland Government Department of Agriculture and Fisheries (State of Queensland, Australia).

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Correspondence to Annelie Marquardt.

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Communicated by: John J. Riascos

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Marquardt, A., Henry, R.J. & Botha, F.C. Midrib Sucrose Accumulation and Sugar Transporter Gene Expression in YCS-Affected Sugarcane Leaves. Tropical Plant Biol. 12, 186–205 (2019). https://doi.org/10.1007/s12042-019-09221-7

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  • DOI: https://doi.org/10.1007/s12042-019-09221-7

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