I don't get this Grand Challenge thing? Can you provide a few examples?
Sure, here are a few generic ones. Also, see the Community Wiki and start/join a discussion on GC's in plant biology.
What is the relationship between phenotype and genotype on the level of a whole organism?
How does single cell grow and develop into a complex, multicellular organism like a plant?
What is the relationship between form and function?
What will be the effect of climate change on productivity and sustainability of agricultural systems? on species composition and survival in ecosystems?
Can food and fuel production be improved and optimized in order to provide sustainably and equitably for 9 billion people in the next 50 years?
