Chemical-shift imaging of plants

For chemical-shift imaging of plants, standard spin-echo imaging sequences are used. Chemical-shift resolution is introduced by selective excitation in the absence of gradients, chemical-shift difference methods (cf. Section 6.2.4), or by saturation of unwanted resonances. Good chemical-shift resolution requires high-field strengths, and microscopic 

8 [Bull j (a) H-NMR spin-echo image of a 3()-tlays old Viria faha seedling in a 15 cm diameter plastic pot of pealite with 199p. soil moisture, (b) Similar root system with higher soil moisture. 

Sucrose is a key carbohydrate in plant metaholism. The concentration of. sucrose in space and time is an important parameter in plant growth and morphogenesis, which can be determined by spatially resolved NMR [Metl, TselJ. The sucrose distribution, for example, has been examined quantitatively in Ricinus communis seedlings Metl ]. Until now, information on the sucrose concentration in the phloem has been obtained only by several destructive methods. They all require the opening of the sieve tubes, which in turn may modify the water flow in the plant, so that it cannot be knowm whether or not 

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