caa a22 4500 397522061 CHVBK 20180308164635.0 cr unu---uuuuu 161202e199505 xx s 000 0 eng 10.1093/jxb/46.5.525 doi (NATIONALLICENCE)oxford-10.1093/jxb/46.5.525 Characterization of a wilty sunflower (Helianthus annuus L.) mutant [Elektronische Daten] III. Phenotypic interaction in reciprocal grafts from wilty mutant and wild-type plants [Marco Fambrini, Paolo Vernieri, Maria L. Toncelli, Valentina D. Rossi, Claudio Pugliesi] The present study was conducted to evaluate phenotypic interaction in reciprocal grafts between wilty (w-1) sunflower mutant and normal (W-1) plants. The w-1 genotype is a ‘leaky' ABA-deficient mutant, characterized by high stomatal conductance, in both light and dark conditions, and high transpiration rate. In well-watered conditions, mutant scions grafted on to normal rootstock (w-1/W-1) showed higher leaf relative water content, leaf water potential and ABA levels than those of control grafts (w-1/w-1). In addition, detached leaves of w-1/W-1 exhibited lower water loss than w-1/w-1 grafts, while mutant rootstock did not affect the transpiration rate of detached W-1 leaves. When drought stress was imposed to potted plants by withholding water, the mutant scions grafted on to normal roots showed a partial phenotypic reversion. A rapid stomatal closure and a rise in ABA levels in response to a small decrease in leaf water potential was observed. By contrast, in w-1/w-1 grafts significant reductions in stomatal conductance and ABA accumulation were detected only in conjunction with a severe water deficit. W-1 scions on mutant stocks (W-1/w-1) maintained the normal phenotype of control wild-type grafts (W1/W-1). © Oxford University Press Research Papers nationallicence ABA nationallicence grafting nationallicence Helianthus annuus nationallicence stomatal conductance nationallicence water relations nationallicence wilty mutant nationallicence Fambrini Marco Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut Vernieri Paolo Dipartimento di Biologia delle Piante Agrarie Sezione di Orticoltura e Floricoltura, Viale delle Piagge 23, l-56124 Pisa, Italy aut Toncelli Maria L. Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut Rossi Valentina D. Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut Pugliesi Claudio Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut Journal of Experimental Botany Oxford University Press 46/5(1995-05), 525-530 0022-0957 46:5<525 1995 46 exbotj https://doi.org/10.1093/jxb/46.5.525 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/jxb/46.5.525 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fambrini Marco Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut NATIONALLICENCE 700 1- Vernieri Paolo Dipartimento di Biologia delle Piante Agrarie Sezione di Orticoltura e Floricoltura, Viale delle Piagge 23, l-56124 Pisa, Italy aut NATIONALLICENCE 700 1- Toncelli Maria L. Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut NATIONALLICENCE 700 1- Rossi Valentina D. Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut NATIONALLICENCE 700 1- Pugliesi Claudio Dipartimento di Biologia delle Piante Agrarie Sezione di Genetica, Via Matteotti 1B, l-56124 Pisa, Italy aut NATIONALLICENCE 773 0- Journal of Experimental Botany Oxford University Press 46/5(1995-05), 525-530 0022-0957 46:5<525 1995 46 exbotj Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford