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© 1992 Oxford University Press

RESEARCH-ARTICLE

Interspecific Grafts Demonstrate Root System Control of Leaf Water Status in Water-Stressed Phaseolus1

P. L. SANDERS and A. H. MARKHART, III

Department of Horticultural Science, University of Minnesota St. Paul, MN 55108, USA

To whom correspondence should be addressed.

We examined the importance and the mechanisms of the root systems' effect on leaf water status in two bean species: Phaseolus vulgaris L. cv. Redcloud (Pv) and P. acutifolius Gray MN cultivated accession 258/78 (Pa). Pa maintains a higher leaf water potential ({psi}1) than Pv. We used reciprocal grafts between the two species. We grew four plants (one of each graft combination) in one pot so they experienced the same soil water potential. Shoot genotype determined {psi}1 of well-watered plants. Root genotype determined {psi}1 of the most stressed plants. Stressed Pa root systems increased {psi}1 of Pv shoots by 0·1 MPa over Pv shoots on Pv roots. Pa roots did not maintain {psi} by affecting stomatal conductance nor by simply having more dry weight. Pa roots may have greater hydraulic conductivity than Pv roots.

Key words: Phaseolus acutifolius, Phaseolus vulgaris, leaf water potential, root-shoot communication


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