Comparative responses to water stress in stay-green, rapid- and slow senescing genotypes of the biomass crop, Miscanthus
Article first published online: 30 APR 2002
Volume 154, Issue 2, pages 335–345, May 2002
How to Cite
Clifton-Brown, J. C., Lewandowski, I., Bangerth, F. and Jones, M. B. (2002), Comparative responses to water stress in stay-green, rapid- and slow senescing genotypes of the biomass crop, Miscanthus. New Phytologist, 154: 335–345. doi: 10.1046/j.1469-8137.2002.00381.x
- Issue published online: 30 APR 2002
- Article first published online: 30 APR 2002
- Received: 17 August 2001; Accepted: 6 December 2001
- abscisic acid (ABA);
- C4 plants;
- • Although hybrids of the perennial rhizomatous grass Miscanthus give high yields under irrigation, their use as a biomass crop in many locations is limited by inadequate water availability. Here, the effects of reduced water availability on growth are reported for three Miscanthus genotypes with differing responses to drought.
- • In a controlled environment experiment during a drought treatment M. sinensis hybrid (Sin-H6) had no detectable photosynthesis and negligible leaf conductance, whereas M. × giganteus (Gig-3) continued to photosynthesize and transpire but it shed leaf area through senescence. A M. sacchariflorus line (Sac-5) was generally intermediate in its response. Measurements on 3-y-old stands of Gig-3 and Sin-H6 in the field during a short summer drought in August 1999 confirmed the controlled environment observations.
- • Stay-green characteristics in Sin-H6 appeared to rely on tight control of transpiration through lowered leaf conductance, although the highest leaf ABA concentrations were not found in this genotype.
- • Stay-green genotypes, such as Sin-H6, are likely to be important for further breeding of Miscanthus because they appear to make the most effective use of available water.