Early exposure to ethylene modifies shoot development and increases sucrose accumulation rate in sugarcane

Fong Chong, Barrie, Mills, Edwina, Bonnett, Graham D. and Gnanasambandam, Annathurai (2010) Early exposure to ethylene modifies shoot development and increases sucrose accumulation rate in sugarcane. Journal of Plant Growth Regulation, 29 2: 149-163. doi:10.1007/s00344-009-9118-3

Author Fong Chong, Barrie
Mills, Edwina
Bonnett, Graham D.
Gnanasambandam, Annathurai
Title Early exposure to ethylene modifies shoot development and increases sucrose accumulation rate in sugarcane
Journal name Journal of Plant Growth Regulation   Check publisher's open access policy
ISSN 0721-7595
Publication date 2010-06
Year available 2009
Sub-type Article (original research)
DOI 10.1007/s00344-009-9118-3
Volume 29
Issue 2
Start page 149
End page 163
Total pages 15
Editor Jutta Ludwig-Mueller
Place of publication New York, NY, United States
Publisher Springer New York
Collection year 2011
Language eng
Formatted abstract
Sugarcane varieties (Saccharum spp. hybrids) that accumulate high levels of sucrose at the start of the harvest season are of considerable commercial interest. Our understanding of the factors that contribute to early sucrose accumulation in these varieties is limited. In this study we used the plant hormone ethylene to investigate the relationship between growth and early sucrose accumulation in sugarcane. The sugarcane variety KQ228 was exposed to a low concentration of the ethylene-forming compound 2-chloroethylphosphonic acid (CEPA) for a prolonged duration commencing from shoot emergence. The changes in sucrose accumulation and plant growth were investigated. Results from two glasshouse experiments revealed that the CEPA-treated plants accumulated a significantly higher amount of sucrose in their primary culm 2 and 3½ months post-germination. The treated plants had taller primary culms with many smaller internodes, smaller leaves, and a higher photosynthetic rate. Despite producing smaller internodes, treated culms were comparable in fresh weight and volume to the controls due to the compensating effect of faster internode formation. We identified three factors that may have contributed to the early accumulation of more sucrose in the treated culm: (1) the specific leaf area of young leaves was greater indicating efficient diversion of photoassimilate to sink tissue, (2) internode formation was initiated earlier, and (3) internodes continued to form at a faster rate. Consequently, a greater proportion of the internodes in the treated sugarcane matured earlier and began filling with sucrose sooner. The higher reducing sugar level in the apical region of the culm probably contributed to faster internode development. This coincided with elevated vacuolar and cell wall acid invertase gene expression that increased sucrose turnover in the vacuole and increased apoplastic uptake of reducing sugars. These findings extend our understanding of how some sugarcane varieties can naturally accumulate a high level of sucrose early in the season.
© Springer Science+Business Media, LLC 2009
Keyword Saccharum spp.
Sucrose accumulation
2-Chloroethylphosphonic acid
Acid invertase
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 22 September 2009.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Biological Sciences Publications
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 3 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 06 Jun 2010, 00:03:47 EST