@article{SprengerRudackSchudomaetal.2015,
  author    = {Sprenger, Heike and Rudack, Katharina and Schudoma, Christian and Neumann, Arne and Seddig, Sylvia and Peters, Rolf and Zuther, Ellen and Kopka, Joachim and Hincha, Dirk K. and Walther, Dirk and Koehl, Karin},
  title     = {Assessment of drought tolerance and its potential yield penalty in potato},
  series = {Functional plant biology : an international journal of plant function},
  volume    = {42},
  journal   = {Functional plant biology : an international journal of plant function},
  number    = {7},
  publisher = {CSIRO},
  address   = {Clayton},
  issn      = {1445-4408},
  doi       = {10.1071/FP15013},
  pages     = {655 -- 667},
  year      = {2015},
  abstract  = {Climate models predict an increased likelihood of seasonal droughts for many areas of the world. Breeding for drought tolerance could be accelerated by marker-assisted selection. As a basis for marker identification, we studied the genetic variance, predictability of field performance and potential costs of tolerance in potato (Solanum tuberosum L.). Potato produces high calories per unit of water invested, but is drought-sensitive. In 14 independent pot or field trials, 34 potato cultivars were grown under optimal and reduced water supply to determine starch yield. In an artificial dataset, we tested several stress indices for their power to distinguish tolerant and sensitive genotypes independent of their yield potential. We identified the deviation of relative starch yield from the experimental median (DRYM) as the most efficient index. DRYM corresponded qualitatively to the partial least square model-based metric of drought stress tolerance in a stress effect model. The DRYM identified significant tolerance variation in the European potato cultivar population to allow tolerance breeding and marker identification. Tolerance results from pot trials correlated with those from field trials but predicted field performance worse than field growth parameters. Drought tolerance correlated negatively with yield under optimal conditions in the field. The distribution of yield data versus DRYM indicated that tolerance can be combined with average yield potentials, thus circumventing potential yield penalties in tolerance breeding.},
  language  = {en}
}
@article{LicausiGiorgiSchmaelzlinetal.2011,
  author    = {Licausi, Francesco and Giorgi, Federico Manuel and Schmaelzlin, Elmar and Usadel, Bj{\"o}rn and Perata, Pierdomenico and van Dongen, Joost Thomas and Geigenberger, Peter},
  title     = {HRE-Type Genes are regulated by Growth-Related Changes in internal Oxygen Concentrations During the normal development of Potato (Solanum tuberosum) Tubers},
  series = {Plant \& cell physiology},
  volume    = {52},
  journal   = {Plant \& cell physiology},
  number    = {11},
  publisher = {Oxford Univ. Press},
  address   = {Oxford},
  issn      = {0032-0781},
  doi       = {10.1093/pcp/pcr128},
  pages     = {1957 -- 1972},
  year      = {2011},
  abstract  = {The occurrence of hypoxic conditions in plants not only represents a stress condition but is also associated with the normal development and growth of many organs, leading to adaptive changes in metabolism and growth to prevent internal anoxia. Internal oxygen concentrations decrease inside growing potato tubers, due to their active metabolism and increased resistance to gas diffusion as tubers grow. In the present work, we identified three hypoxia-responsive ERF (StHRE) genes whose expression is regulated by the gradual decrease in oxygen tensions that occur when potato tubers grow larger. Increasing the external oxygen concentration counteracted the modification of StHRE expression during tuber growth, supporting the idea that the actual oxygen levels inside the organs, rather than development itself, are responsible for the regulation of StHRE genes. We identified several sugar metabolism-related genes co-regulated with StHRE genes during tuber development and possibly involved in starch accumulation. All together, our data suggest a possible role for low oxygen in the regulation of sugar metabolism in the potato tuber, similar to what happens in storage tissues during seed development.},
  language  = {en}
}