Architectural and non architectural effects of salinity on canopy structure light interception and dry mass production on greenhouse cucumber and tomato Cucumber tomato functional structural plant model salinity stress light interception photosynthesis light use efficiency quantitative limitation analysis. Gurke Tomate funktionell strukturelles Pflanzenmodell Salzstress Lichtaufnahme Photosynthese Lichtnutzungseffizient quantitative Limitierungsanalyse