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- Title
Blue and red light effects on stomatal oscillations.
- Authors
Ballard, Trevor; Peak, David; Mott, Keith
- Abstract
The response of stomata to red and blue light was investigated using small fibre optics (66 µm diameter) to control light levels on a single pair of guard cells without affecting the surrounding tissue. Low intensity red light (50 µmol m–2 s–1) applied to the entire leaf caused stomata to oscillate continuously for several hours with no apparent decrease in amplitude with time. Adding low intensity blue light (50 µmol m–2 s–1) caused stomata to stop oscillating, but oscillations resumed when the blue light was removed. Adding the same intensity of red light to an oscillating leaf changed the amplitude of the oscillations but did not stop them. When blue light was added to a single guard cell pair (using a fibre optic) in a red-light-illuminated leaf, the stoma formed by that pair stopped oscillating, but adjacent stomata did not. Red light added to a single guard cell pair did not stop oscillations. Finally, blue light applied through a fibre optic to areas of leaf without stomata caused proximal stomata to stop oscillating, but distal stomata continued to oscillate. The data suggest that blue light affects stomata via direct effects on guard cells as well as by indirect effects on other cells in the leaf. Plants absorb CO2 through pores in their leaves called stomata, which are known to open and close in response to myriad environmental and physiological triggers. We demonstrate here that blue light inhibits stomatal aperture oscillations in both the guard cells and surrounding tissue layers, whereas these oscillations continue under the influence of red light. This observation of blue light behaviour agrees with recent research and suggests another physiological pathway for oscillations.
- Subjects
EFFECT of blue light on plants; STOMATA; PLANT physiology; GUARD cells (Plant anatomy); OSCILLATIONS
- Publication
Functional Plant Biology, 2019, Vol 46, Issue 2, p146
- ISSN
1445-4408
- Publication type
Article
- DOI
10.1071/FP18104