IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Morphological, physiological and biochemical responses to soil water deficit in seedlings of three populations of wild pear (Pyrus boisseriana)
Autor/es:
ZARAFSHAR M; AKBARINIA M; ASKARI H; HOSSEINI SM; RAHAIE M; STRUVE D; STRIKER GG
Revista:
BIOTECHNOLOGIE, AGRONOMIE, SOCIéTé ET ENVIRONNEMENT
Editorial:
FAC UNIV SCIENCES AGRONOMIQUES GEMBLOUX
Referencias:
Lugar: Gembloux; Año: 2014 vol. 18 p. 353 - 366
ISSN:
1370-6233
Resumen:
Water shortage limits production of fruit orchards, like pear, in arid and semi-arid regions. The identification of wild pear germplasm for potential use as rootstock would be valuable for pear cultivation in semi-arid regions. Relative drought tolerance of wild pear germplasm (Pyrus boisseriana) from three different populations distributed along an elevational gradient (semi-arid 1000, semi-wet 1350 and semi-wet 1600 populations) was evaluated in a greenhouse trial. Established container-grown seedlings were exposed to 18 days of simulated drought, or not, followed by a seven day recovery. Biomass allocation and accumulation, physiological (stomatal conductance, photosynthesis, transpiration, xylem water potential) and biochemical parameters (leaf pigments, free proline, malondialdehyde and hydrogen peroxide production) were evaluated. Although all populations were able to recover from water shortage, thereby being relatively drought tolerant, some differences among populations were detected for gas exchange parameters, biomass accumulation and proline concentration in favor of the semi-arid 1000 elevation population, which was more drought tolerant; it had the most rapid and complete recovery of physiological activity (stomatal conductance and carbon fixation). In addition, all populations increased carotenoids in leaves. Overall, we showed that plants from semi-arid 1000 elevation greater tolerance to drought than those from higher elevations. Although the initial drought resistance response of the 1000 elevation source was promising, additional field studies are needed to confirm the greenhouse results and the benefit of a more drought resistant rootstock to commercial scions.