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Wageningen University (2001)

Evaluation of salt and drought resistance of two pistachio species (Pistacia khinjuk and P. mutica) in terms of ecophysiological and growth characteristics

Fardooei, Abolfazl Ranjbar

Titre : Evaluation of salt and drought resistance of two pistachio species (Pistacia khinjuk and P. mutica) in terms of ecophysiological and growth characteristics

Auteur : Fardooei, Abolfazl Ranjbar

Université de soutenance : Wageningen University

Grade : Doctor of Philosophy (PhD) 2001

Résumé partiel
The aim of this study is the evaluation of salt and drought stress resistance of two species of wild trees that are effective in agricultural economy of arid and semi-arid areas of Iran.

Two wild pistachio species (Pistacia khinjuk and P. mutica) were selected.

In this respect, we conducted three types of experiments over a three years’ period in the greenhouse. In the first year, the effect of salt stress was evaluated on P. khinjuk and P. mutica according to their ecophysiological and growth characteristics. The salinity treatments used in this experiment were 0.8 (control), 6, 12 and 19 dS m−1. The results of our investigation show that significant inhibitory effects of salt stress treatments on ecophysiological parameters of both pistachio species start at 12 dS m−1 and were more pronounced at 19 dS m−1.

The results obtained from this study (Chapter 3) indicate that Pistacia khinjuk is more salt resistance than P. mutica. We also conclude that the two species are glycophyte plants with relatively high salt resistance. In the second year, evaluations of drought stress effects were carried out on P. khinjuk and P. mutica with respect of their ecophysiological characteristics. The observations made in this study illustrate that low drought stress (−0.50 MPa) has no significant inhibitory effects on ecophysiological parameters of the species. By decreasing the osmotic potential of the nutrient solution at −1.00 MPa (moderate drought stress), significant alternations in ecophysiological parameters of both species such as a decrease in net photosynthesis, transpiration, leaf water status, chlorophyll concentration, stomatal conductance and increase in stomatal resistance were observed. These alternations were more pronounced at −1.55 MPa (severe drought stress). The results obtained from this study (Chapter 4) indicate that leaf osmotic adjustment in P. khinjuk is lower than in P. mutica, which reflects the ecological conditions of their origin.

Mots clés : pistacia khinjuk / pistacia mutica / drought resistance / salt tolerance / plant physiology / growth rate / pistachios / iran / agroecology / ecophysiology

Présentation (ProQuest)

Présentation

Page publiée le 6 février 2015, mise à jour le 29 mai 2021