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Do steviol glycosides act either as a carbon storage pool or in osmoregulation within leaves of stevia rebaudiana?

journal contribution
posted on 04.06.2019, 00:00 by R deGuzman, David MidmoreDavid Midmore, Kerry WalshKerry Walsh
Steviol glycosides (SG) (with stevioside and rebaudioside A predominating) are present in wild-type Stevia rebaudiana, at approximately 10% of dry weight (dw), prompting a consideration of the autoecological role played by these compounds in terms of energy (C) storage and/or osmoregulation. The leaf starch pool was observed to change diurnally with respect to the light cycle (from 3.29% to 0.73% of leaf dw between dusk and dawn) and also to increase under constant light treatment (from 1.53% to 6.25% of leaf dw), while SG pools were relatively constant (around 6% w/dw). A similar trend was observed during exposure to elevated CO2 (800 ppm), with starch increasing (from 10% to 15% of leaf dw), while SG pool size was constant (around 12% w/dw). For plants subject to increasing water stress over several days, an increase in leaf sap osmolality was observed in the leaves of a severely stressed group (from -1 MPa to -3 MPa, after 2 days of treatment), while stevioside and rebaudioside A leaf concentration was relatively constant (around 16% w/dw). These results are not consistent with a role for SG as either a short-term C store or osmoregulator in S. rebaudiana. Copyright © 2018 American Chemical Society and American Society of Pharmacognosy.

Funding

Category 3 - Industry and Other Research Income

History

Volume

81

Issue

11

Start Page

2357

End Page

2363

Number of Pages

7

eISSN

1520-6025

ISSN

0163-3864

Publisher

American Chemical Society, US

Peer Reviewed

Yes

Open Access

No

Era Eligible

Yes

Journal

Journal of Natural Products