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INCREASED RATES OF PHOTOSYNTHESIS IN LOCALIZED REGIONS OF A BARLEY LEAF INFECTED WITH BROWN RUST.

J D Scholes¹, J F Farrar¹

¹School of Plant Biology, University College of North Wales, Bangor, Gwynedd LL57 2UW, UK.

The New Phytologist

|April 20, 2021

Summary

Barley leaves infected with brown rust show reduced net photosynthesis due to lower rates between pustules. However, gross photosynthesis increases within fungal pustules, and phosphate feeding doesn't boost rates, suggesting other mechanisms are at play.

Keywords:

Barley brown rust phosphate photosynthesis

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Area of Science:

Plant pathology
Photosynthesis research
Fungal-plant interactions

Background:

Brown rust (Puccinia hordei Otth.) infection significantly impacts host plant physiology.
Understanding localized photosynthetic changes is crucial for disease management.

Purpose of the Study:

To investigate the impact of brown rust on photosynthesis in barley at both whole-leaf and localized levels.
To test the hypothesis that fungal sequestration of inorganic phosphate (Pi) limits photosynthesis.

Main Methods:

Measurement of net and gross photosynthesis rates in infected and control barley leaves.
Oxygen evolution assays in localized leaf regions, including pustules and inter-pustule areas.
Autoradiography and Pi feeding experiments to assess phosphate limitation.

Main Results:

Net photosynthesis and quantum yield decreased in whole infected leaves.
Gross photosynthesis per unit chlorophyll increased within rusted leaf areas.
Photosynthesis declined most significantly in regions between pustules.
Inorganic phosphate feeding did not enhance photosynthesis, indicating Pi was not limiting.

Conclusions:

Brown rust infection alters photosynthesis differentially across the leaf, increasing it in pustules but decreasing it between them.
The decline in net photosynthesis is primarily due to reduced rates in inter-pustule regions.
Fungal sequestration of inorganic phosphate is unlikely to be the sole cause of photosynthetic decline.