title: Differential adaptation of two varieties of common bean to abiotic stress: I. Effects of drought on yield and photosynthesis.
abstract: The yield of 24 commercial varieties and accessions of common bean (Phaseolus vulgaris) has been determined at different sites in Chile and Bolivia. Statistical analysis was performed in order to characterize whether a particular variety was more or less stable in yield under different environmental conditions. Amongst these, two varieties have been identified for more detailed study: one variety has a higher than average yield under unstressed conditions but is strongly affected by stress, and another has a reduced yield under unstressed conditions but is less affected by stress. The contrasting rate of abscission of the reproductive organs under drought stress was clearly consistent with these differences. The more tolerant genotype shows a great deal of plasticity at the biochemical and cellular level when exposed to drought stress, in terms of stomatal conductance, photosynthetic rate, abscisic acid synthesis, and resistance to photoinhibition. By contrast, the former lacks such plasticity, but shows an enhanced tendency for a morphological response, the movement of leaves, which appears to be its principal response to drought stress.
authors.affiliation: Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 1004, Santiago, Chile.
authors.forename: Carolina
authors.initials: C
authors.lastname: Lizana
authors.forename: Mark
authors.initials: M
authors.lastname: Wentworth
authors.forename: Juan P
authors.initials: JP
authors.lastname: Martinez
authors.forename: Daniel
authors.initials: D
authors.lastname: Villegas
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Meneses
authors.forename: Erik H
authors.initials: EH
authors.lastname: Murchie
authors.forename: Claudio
authors.initials: C
authors.lastname: Pastenes
authors.forename: Bartolomeo
authors.initials: B
authors.lastname: Lercari
authors.forename: Paulo
authors.initials: P
authors.lastname: Vernieri
authors.forename: Peter
authors.initials: P
authors.lastname: Horton
authors.forename: Manuel
authors.initials: M
authors.lastname: Pinto
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D000064:Acclimatization; D000872:Anthocyanins / Q000378:metabolism; D018556:Crops, Agricultural / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D003681:Dehydration; D005838:Genotype; D008027:Light; D008315:Malondialdehyde / Q000378:metabolism; D027805:Phaseolus / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D010788:Photosynthesis; D018515:Plant Leaves / Q000254:growth & development / Q000502:physiology; D012621:Seasons; D014867:Water / Q000378:metabolism*
chemical_list: D000872:Anthocyanins; D014867:Water; D008315:Malondialdehyde; D000040:Abscisic Acid