Consequences of moderate drought stress on the net photosynthesis, water-use efficiency and biomass production of three poplar clones
- 395 Downloads
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.
KeywordsPhotosynthesis Water-use efficiency Drought stress Shoot:root ratio Poplar
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.
- Baum S, Weih M, Busch G, Kroiher F, Bolte A (2009) The impact of Short Rotation Coppice plantations on phytodiversity. Landbauforschung vTI Agric For Res 59:163–170Google Scholar
- Demeritt ME Jr (1990) Populus L. poplar hybrids. In: Burns RM, Honkala BH (eds) Silvics of North America, vol 1 Hardwoods. Agricultural Handbook 654. U.S. Department of Agriculture, Forest Service, Washington DCGoogle Scholar
- Dreyer E, Bogeat-Triboulot MB, Le Thiec D, Guehl JM, Brignolas F, Villar M, Bastien C, Martin F, Kohler A (2004) Drought tolerance of poplars: can we expect to improve it? Biofutur 247:54–58Google Scholar
- Fry DA (2008) The biodiversity of short rotation willow coppice in Wales, with particular reference to birds. Thesis for PhD, UMI U585248, Cardiff University, UKGoogle Scholar
- Monclus R, Villar M, Barbaroux C, Bastien C, Fichot R, Dreyer E, Delmotte FM, Delay D, Petit J, Bre C (2009) Productivity, water-use efficiency and tolerance to moderate water deficit correlate in 33 poplar genotypes from a Populus deltoides × Populus trichocarpa F 1 progeny. Tree Physiol 29:1329–1339CrossRefPubMedGoogle Scholar
- Nash RM (2009) Drought adaptations of hybrid poplar clones commonly grown on the Canadian prairies. Thesis for a Master of Science. University of Saskatchewan, CanadaGoogle Scholar
- Tschaplinski TJ, Tuskan GA, Sewell MM, Gebre GM, Todd DE, Pendley CD (2006) Phenotypic variation and quantitative trait locus identification for osmotic potential in an interspecific hybrid inbred F2 poplar pedigree grown in contrasting environments. Tree Physiol 26:595–604CrossRefPubMedGoogle Scholar