22 research outputs found
Association mapping for root architectural traits in durum wheat seedlings as related to agronomic performance
Identifying water stress-response mechanisms in citrus by in silico transcriptome analysis
A method for evaluating dynamic functional network connectivity and task-modulation: application to schizophrenia
Regularized selection indices for breeding value prediction using hyper-spectral image data
Introgression of Root and Water Use Efficiency Traits Enhances Water Productivity: An Evidence for Physiological Breeding in Rice (Oryza sativa L.)
Supercritical Carbon Dioxide Extraction of Sinensetin, Isosinensetin, and Rosmarinic Acid from Orthosiphon stamineus Leaves: Optimization and Modeling
Drought Resistance in Crops: Physiological and Genetic Basis of Traits for Crop Productivity
The coupling effects of water deficit and nitrogen supply on photosynthesis, WUE, and stable isotope composition in Picea asperata
Water stress and nitrogen (N) availability are the two main factors limiting plant growth, and the two constrains can interact in intricate ways. Moreover, atmospheric N depositions are altering the availability of these limiting factors in many terrestrial ecosystems. Here, we studied the combined effects of different soil water availability and N supply on photosynthesis and water-use efficiency (WUE) in Picea asperata seedlings cultured in pots, using gas exchange, and stable carbon and nitrogen isotope composition (delta C-13 and delta N-15). Photosynthesis under light saturation (A(sat)) and stomatal conductance (g(s)) of P. asperata decreased as the soil moisture gradually diminished. Under severe water-stress condition, N addition decreased the Asat and gs, whereas the positive effects were observed in moderate water-stress and well-watered conditions. The effect of N addition on the intrinsic WUE (WUEi) deduced from gas exchange was associated with soil water availability, whereas long-term WUE evaluated by leaf delta C-13 only affected by soil water availability, and it would be elevated with soil moisture gradually diminished. Water deficit would restrict the uptake and further transport of N to the aboveground parts of P. asperata, and then increasing delta N-15. Therefore, delta N-15 in plant tissues may reflect changes in N allocation within plants. These results indicate that the effect of N enrichment on photosynthesis in P. asperata is largely, if not entirely, dependent on the severity of water stress, and P. asperata would be more sensitive to increasing N enrichment under low soil water availability than under high soil moisture