Evaluation of some physiological responses to drought stress in grafted and ungrafted almond rootstocks

Document Type : Full Paper

Authors

1 Ph.D. Candidate, Department of Horticultural Sciences, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

2 Instructor of Agronomic and Horticultural Crops Research Department, Chaharmahal and Bakhtiari Agricultural and Natural Resources Research and Education Center, Shahrekord, Iran

3 Professor, Department of Horticultural Sciences, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

4 Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

Abstract

The effect of drought stress were studied on some physiological aspects of five grafted and ungrafted rootstocks including GF677, Garnem, peach seedlings, almond seedlings and a selected local almond ×peach  hybrid (LAP), with Ferragnes cultivar as scion. Three different drought stress levels including moderate (Ψsoil= -0.9 Mpa) sever (Ψsoil= -1.5 Mpa) and a control (Ψsoil= -0.3 Mpa) were applied in a randomized complete block design as factorial with three replications in pot plants during four weeks. Physiological traits including chlorophyll (Chl) fluorescence indices, leaf relative water contents (RWC), membrane stability index (MSI), free proline and concentrations of leaf pigments were recorded.Results showed that photochemical efficiency of photosystem II (Fv/Fm), RWC, Chl a, Chl b and total Chl were reduced significantly under drought stress while minimum fluorescence (F0), MSI and Free proline were increased noticeably. Drought stress affected significantly on evaluated traits in ungrafted rootstocks compared to grafted ones. According to results, almond seedlings, GF677 and local LAP almost showed similar responses to drought stress and had more tolerance than Garnem rootstock. Peach seedlings were affected significantly by drought stress more than the other rootstocks. Present study suggests chlorophyll fluorescence index as a simple trait for evaluation of almond rootstocks exposed to sever drought stress.

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References

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Iranian Journal of Horticultural Science
Volume 50, Issue 2 - Serial Number 2
September 2019
Pages 311-323

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History

  • Receive Date: 30 November 2017
  • Revise Date: 10 February 2018
  • Accept Date: 24 February 2018

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