Sanwo MM, Goins GD, Yorio NC, Brown CS.
Plant Physiol. 1997 Jul; 114: 81.
Kennedy Space Center 32899, USA.
Studies were undertaken to examine the influence of red and blue light on leaf carbohydrate metabolism in wheat (Triticum aestivum L. cv. USU-Super Dwarf). Plants were grown under 350 micromoles m-2 s-1 PAR (continuous light) supplied by either narrow spectrum red light-emitting diodes (LEDs) (660nm), red LEDs + 1% , 3% or 10% blue fluorescent light, or daylight fluorescent (white) light. During vegetative growth and grain development, leaf starch and glucose concentrations were 30-50% greater in plants grown under red LEDs alone or red LEDs with any amount of blue light relative to white-light grown control plants. Plants under red LEDs also had high levels of ADP-Glc pyrophosphorylase activity, a regulatory enzyme in starch synthesis, compared to white-light grown plants. Leaf sucrose concentrations were 20-30% lower in plants grown under red LEDs compared to plants under white light or the red + blue light treatments during vegetative growth, pre-anthesis and grain development. The activity of the sucrose synthetic enzyme, sucrose phosphate synthase, was 40-50% lower in plants grown under red LEDs compared to the other light treatments. These data suggest that the accumulation of relatively high levels of starch and low levels of sucrose in leaves of plants grown under red LEDs may be related to changes in the activities of enzymes involved in starch and sucrose synthesis.
Publication Types:
Keywords:
- Light
- Plant Leaves
- Triticum
- NASA Center KSC
- NASA Discipline Plant Biology
Other ID:
UI: 102234716
From Meeting Abstracts