Ali Esmaeilpour, Marie-Christine Van Labeke, Roeland Samson, Siamak Ghaffaripour, Patrick Van Damme
Department of Plant Production,Faculty of Bio-Science Engineering, Ghent University, Ghent Belgium
Department of Horticulture, Iranian Pistachio Research Institute (IPRI), Rafsanjan, Iran
Department of Bioengineering,University of Antwerp, Antwerpen , Belgium
Department of Crop Sciences and Agroforestry in the Tropics and Subtropics, Czech University of Life Sciences Prague, Prague, Czech Republic
Key words: Environmental stress, Relative chlorophyll, Plant dry weight, Osmotic stress, Ecophysiology.
Pistachio (Pistacia vera L.)has a high tolerance to soil drought and salinity.Especially adult trees are well-known for drought resistance. We carried out a greenhouse experiment to evaluate the effects of two drought stress levels (Ψs= -0.75 MPa, Ψs= -1.5 MPa) and subsequent recovery on relative chlorophyll content and biomass production in three Iranian pistachio cultivars i.e. Akbari, Kaleghochi and Ohadi. Both drought stress levels lowered leaf relative chlorophyll content and total plant dry weight. Ohadi had significantly higher rates of relative chlorophyll and plant dry weights (biomass) under drought stress conditions compared to Akbari, whereas Kaleghochi showed intermediate results.Six drought tolerance indices including stress susceptibility index (SSI), stress intensity (SI), stress tolerance index (STI), stress tolerance (TOL), mean productivity (MP) and geometric mean productivity (GMP) were calculated from total plant dry weight (biomass) under severe drought and non-stressed (control) conditions.Our results show a significant relationship between both absolute plant biomass and plant biomass reduction (TOL) with STI, MP and GMPfor pistachio cultivars. Tolerance indices including STI identified cultivars which produce high plant biomass in both favorable and unfavorable moisture conditions.These results demonstrate that Ohadi may be more tolerant to drought in terms of biomass productivity as it performs better than other cultivars.
Get the original articles in Source: Volume 7, Number 2, August 2015 – IJAAR
Published By: International Network for Natural Sciences