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The photosynthetic induction response in wheat leaves: net CO2 uptake, enzyme activation, and leaf metabolites

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Abstract

The photosynthetic induction response was studied in whole leaves of wheat (Triticum aestivum L.) following 5-min, 30-min and 10-h dark periods. After the 5-min dark treatment there was a rapid burst in the rate of photosynthesis upon illumination (half of maximum after 30s), followed by a slight decrease after 1.5 more min and then a gradual rise to the maximum rate. During this initial burst in photosynthesis, there was a rapid rise in the level of 3-phosphoglycerate (PGA) and a high PGA/triose-phosphate (triose-P) ratio was obtained. In addition, after the 5-min dark treatment, ribulose-1,5-bisphosphate carboxylase (Rubisco, EC 4.1.1.39), ribulose-5-phosphate kinase (EC 2.7.1.19) and chloroplastic fructose-1,6-bisphosphatase (EC 3.1.3.11) maintained a relatively high state of activation, and maximum activation occurred within 1 min of illumination. The results indicate there is a high capacity for CO2 fixation in the cycle upon illumination but attaining maximum rates requires an increase in the ribulose-1,5-bisphosphate (RuBP) pool (adjustment in triose-P utilization for carbohydrate synthesis versus RuBP synthesis). With both the 30-min and 10-h dark pretreatments there was only a slight rise in photosynthesis upon illumination, followed by a lag, then a gradual increase to steady-state (half-maximum rate after 6 min). In contrast to the 5-min dark treatment, the level of PGA was low and actually decreased initially, whereas the level of RuBP increased and was high during induction, indicating that Rubisco is limiting. This regulation via the carboxylase was not reflected in the initial extractable activity, which reached a maximum by 1 min after illumination. The light activation of chloroplastic fructose-1,6-bisphosphatase in leaves darkened for 30 min and 10 h prior to illumination was relatively slow (reaching a maximum after 8 min). However, this was not considered to limit carbon flux through the carbon-fixation cycle during induction since RuBP was not limiting. When photosynthesis approached the maximum steady-state rate, a high PGA/triose-P ratio and a high PGA/RuBP ratio were obtained. This may allow a high rate of photosynthesis by producing a favorable mass-action ratio for the reductive phase (the conversion of PGA to triose phosphate) while stimulating starch and sucrose synthesis.

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Abbreviations

Chl:

chlorophyll

FBP:

fructose-1,6-bisphosphate

FBPase:

fructose-1,6-bisphosphatase

Fru6P:

fructose-6-phosphate

Glc6P:

glucose-6-phosphate

PGA:

3-phosphoglycerate

Pi:

inoganic phosphate

Rubisco:

RuBP carboxylase/oxygenase

RuBP:

ribulose-1,5-bisphosphate

Ru5P:

ribulose-5-phosphate

triose-P:

triose phosphates (dihydroxyacetone phosphate+glyceraldehyde-3-phosphate)

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Author notes

  1. John Kobza

    Present address: Desert Research Institute, Biological Sciences Center, P.O. Box 60220, 89506, Reno, NV, USA

Authors and Affiliations

  1. Department of Botany, Washington State University, 99164-4230, Pullman, WA, USA

    John Kobza & Gerald E. Edwards

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  1. John Kobza
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  2. Gerald E. Edwards
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Kobza, J., Edwards, G.E. The photosynthetic induction response in wheat leaves: net CO2 uptake, enzyme activation, and leaf metabolites. Planta 171, 549–559 (1987). https://doi.org/10.1007/BF00392305

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