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Gas Exchanges and Physiological Responses Differ Among ‘Pyrodwarf’ Clonal and ‘Dargazi’ Seedling Pear (Pyrus communis L.) Rootstocks in Response to Drought Stress

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Abstract

Selecting appropriate scion-rootstock combinations, which are determined by the rootstock’s root system, is vital for successful orchard management. There are usually two types of rootstocks available for pear orchards, clonal as well as seedling rootstocks. This research aimed to examine how seedlings and clonal rootstocks respond and withstand soil moisture limitations and drought stress conditions. Two pear rootstocks including ‘Dargazi’ seedlings and ‘Pyrodwarf’ clones were used. The irrigation treatments were well-watered (100% FC), moderate (60% FC), and severe drought (30% FC). The physiological and gas exchange responses were measured at 30 and 60 days after stress treatment (DAT). Results indicated that stomatal restrictions were one of the main causes of photosynthetic limitations under drought stress in the studied pear rootstocks. Photosynthesis (An) in ‘Pyrodwarf’ was more affected by the leaf ABA concentration than in ‘Dargazi’ rootstock. In 60 DAT, ‘Dargazi’ seedlings improved gas exchange parameters, and root dry weight (RDW). The increase in proline and glycine betaine and decrease in leaf water content per unit leaf area (LWCA) under drought stress showed signs of osmotic adjustment in both studied rootstocks. Although at 30 DAT, the photosynthetic restriction of ‘Pyrodwarf’ was affected by the stomatal closure, in 60 DAT the limitation to photosynthesis is maybe non-stomatal. In conclusion, these findings showed that ‘Pyrodwarf’ adapts better to moderate and shorter duration of drought stress, and ‘Dargazi’ was more adapted to severe and long periods of drought stress. This is due to the direct interaction of the rootstock and scion in resistance to drought stress. Besides it can help to select suitable rootstock for orchards faced with moderate to severe drought conditions.

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The authors declare that all the data supporting the findings of this research are available within the article.

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Acknowledgements

We would like to thank Tarbiat Modares University (TMU) for its financial support. This work was supported by Ph.D. Student Grant Program by TMU. In addition, greenhouse and laboratory facilities provided by Pomology Lab., Department of Horticultural Science at TMU are acknowledged.

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Authors and Affiliations

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Contributions

Zeinab Maleki Asayesh: made a major contribution to data collection and statistical analysis, experimental work, writing—original draft, writing—review and editing. Kazem Arzani: managed a Ph.D. student grant from TMU authorities for the first author and supervised the design of the research and data collection, presentation, and reviewed with extensive manuscript draft revisions including the final revision of the article. Ali Mokhtassi-Bidgoli: consulted and helped with the statistical design of the experiment and data analysis. Hamid Abdollahi: advised on some data collection and reviewing the first draft of the manuscript.

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Correspondence to Kazem Arzani.

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Highlights

1. ‘Pyrodwarf’ and ‘Dargazi’ rootstocks showed different physiological and photosynthetic responses to water stress.

2. ‘Dargazi’ showed better resistance to long-duration drought stress compared to ‘Pyrodwarf’ rootstock.

3. The different root systems in the two pear rootstocks could be one of the factors involved in their differences in water stress tolerance.

4. Stomatal restrictions were one of the main causes of photosynthetic limitations under drought stress in pear rootstocks.

5. Photosynthesis (An) in ‘Pyrodwarf’ was more affected by the leaf ABA concentration than in ‘Dargazi’ rootstock.

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Asayesh, Z.M., Arzani, K., Mokhtassi-Bidgoli, A. et al. Gas Exchanges and Physiological Responses Differ Among ‘Pyrodwarf’ Clonal and ‘Dargazi’ Seedling Pear (Pyrus communis L.) Rootstocks in Response to Drought Stress. J Soil Sci Plant Nutr 23, 6469–6484 (2023). https://doi.org/10.1007/s42729-023-01502-1

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  • DOI: https://doi.org/10.1007/s42729-023-01502-1

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