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Consequences of moderate drought stress on the net photosynthesis, water-use efficiency and biomass production of three poplar clones

  • Dietmar Lüttschwager
  • Dietrich Ewald
  • Lucía Atanet Alía
Short Communication

Abstract

The breeding of efficient but drought-tolerant poplar clones is very important for short-rotation planting because of frequent periods with low precipitation in Central Europe. Three clones exhibiting very different shoot–root ratios under well-watered conditions were investigated: (1) the aspen clone Großdubrau No. 1 (Populus tremula); (2) the newly bred aspen clone L316 × L9 No. 21 Thermo (P. tremula × P. tremula); (3) and the poplar clone Max2 (P. maximowiczii × P. trichocarpa). All three clones were exposed to moderate drought stress. Photosynthesis and transpiration were measured. The influences of drought on the biometrical parameters of the plants were evaluated. The intrinsic water-use efficiency (WUEintrinsic) was calculated. Height growth was decreased in stressed plants. Photosynthesis and water conductivity were significantly decreased, which is why the WUEintrinsic exhibited a greater increase in Max2 than in the aspen clones. The poplar clone Max2 showed low WUE after sufficient watering, but this parameter exhibited a greater increase under drought stress compared with the aspen clones. Max2 was characterised by intensive root growth that was diminished under stress. In contrast, both aspen clones were less adaptive to moderate drought stress. The capability to change the WUEintrinsic under different water availabilities can be considered a possible selection criterion for breeding.

Keywords

Photosynthesis Water-use efficiency Drought stress Shoot:root ratio Poplar 

Notes

Acknowledgments

This project was funded and supported by the German Federal Ministry of Food and Agriculture, Agency for Renewable Resources (FNR) under FKZ: 22012510. We thank Christine Ewald for her technical assistance.

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2015

Authors and Affiliations

  • Dietmar Lüttschwager
    • 1
  • Dietrich Ewald
    • 2
  • Lucía Atanet Alía
    • 1
  1. 1.Institute of Landscape BiogeochemistryLeibniz Centre for Agricultural Landscape Research (ZALF)MünchebergGermany
  2. 2.Institute of Forest GeneticsThünen-InstituteWaldsieversdorfGermany

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