TY - BOOK

T1 - Evaluation of Intrinsic Water Use Efficiency and Ecophysiological Modelling on a Potato Dihaploid Mapping Population

AU - Topbjerg, Henrik Bak

PY - 2014

Y1 - 2014

N2 - Drought is one of the major constraints limiting crop production globally. Commonlydrought can be prevented by irrigation. However as modern agriculture utilises morethan three quarters of the available freshwater, increasing irrigation might not be aviable solution due to increased concerns on environmental sustainability. Futuregrowth in the global population predicts that the agricultural output will have toincrease considerably if malnutrition and famine are to be prevented. On this basis,the development of crops capable of producing higher yields under water scarcesituations is being developed. The fourth most commonly grown crop, potato(Solanum tuberosum L.) has the potential of providing nourishment for a larger partof the increasing population. However potato is known to be drought sensitive, whichrenders it unsuitable for future climate scenarios. If potato is to be a part of thesolution the crop has to be able to tolerate drought. In this study, a dihaploid potatomapping population has been used to investigate clonal performance in intrinsicwater use efficiency (WUEi) under progressive drought achieved in greenhouse andunder field conditions. The mapping population revealed relative large differences inWUEi and parameters influencing WUEi. It was found that three clones had anincreased WUEi. In the greenhouse, net photosynthetic rate (An) was found toattribute to the variation in WUEi. Also An was shown to be affected by the plantnitrogen metabolism. However, under field conditions, stomatal conductance (gs)seemed to be the primary factor influencing WUEi. Modelling on gs revealed thesimplistic Ball-Woodrow-Berry model to perform better than other tested models.Model accuracy was however not different and all models predicted gs reasonablywell. In addition, to achieve progression in the development of drought tolerant cropcultivars, faster screening methods have to be developed. Here, it was found that thechlorophyll content index could be a useful screening method for higher WUEi undergreenhouse conditions. However, such methods must rely on physiological traitevaluation in conjunction with agronomical trait evaluation.

AB - Drought is one of the major constraints limiting crop production globally. Commonlydrought can be prevented by irrigation. However as modern agriculture utilises morethan three quarters of the available freshwater, increasing irrigation might not be aviable solution due to increased concerns on environmental sustainability. Futuregrowth in the global population predicts that the agricultural output will have toincrease considerably if malnutrition and famine are to be prevented. On this basis,the development of crops capable of producing higher yields under water scarcesituations is being developed. The fourth most commonly grown crop, potato(Solanum tuberosum L.) has the potential of providing nourishment for a larger partof the increasing population. However potato is known to be drought sensitive, whichrenders it unsuitable for future climate scenarios. If potato is to be a part of thesolution the crop has to be able to tolerate drought. In this study, a dihaploid potatomapping population has been used to investigate clonal performance in intrinsicwater use efficiency (WUEi) under progressive drought achieved in greenhouse andunder field conditions. The mapping population revealed relative large differences inWUEi and parameters influencing WUEi. It was found that three clones had anincreased WUEi. In the greenhouse, net photosynthetic rate (An) was found toattribute to the variation in WUEi. Also An was shown to be affected by the plantnitrogen metabolism. However, under field conditions, stomatal conductance (gs)seemed to be the primary factor influencing WUEi. Modelling on gs revealed thesimplistic Ball-Woodrow-Berry model to perform better than other tested models.Model accuracy was however not different and all models predicted gs reasonablywell. In addition, to achieve progression in the development of drought tolerant cropcultivars, faster screening methods have to be developed. Here, it was found that thechlorophyll content index could be a useful screening method for higher WUEi undergreenhouse conditions. However, such methods must rely on physiological traitevaluation in conjunction with agronomical trait evaluation.

UR - https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122227767005763

M3 - Ph.D. thesis

BT - Evaluation of Intrinsic Water Use Efficiency and Ecophysiological Modelling on a Potato Dihaploid Mapping Population

PB - Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen

ER -