Improving potato drought tolerance through the induction of long-term water stress memory

•Tubers from plants growing under mild water stress (primed seeds) were collected.•Plants from primed and non-primed seeds were submitted to a second water stress.•Plants from primed seeds showed higher yield, antioxidant activity and Δ13C.•Long-term water stress memory occurred mainly in improved p...

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Bibliographic Details
Published in:	Plant science (Limerick) Vol. 238; pp. 26 - 32
Main Authors:	Ramírez, D.A., Rolando, J.L., Yactayo, W., Monneveux, P., Mares, V., Quiroz, R.
Format:	Journal Article
Language:	English
Published:	Ireland Elsevier Ireland Ltd 01-09-2015
Subjects:	Adaptation, Physiological Antioxidant activity Antioxidants - metabolism Carbon isotope discrimination Carbon Isotopes Dehydration Drought Droughts Genotype Humidity Leaf greenness Long-term stress memory Plant Leaves - physiology Seeds - physiology Solanum tuberosum Solanum tuberosum - genetics Solanum tuberosum - physiology Sunlight Temperature Long-term stress memory Carbon isotope discrimination Drought Solanum tuberosum Leaf greenness Antioxidant activity
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Summary:	•Tubers from plants growing under mild water stress (primed seeds) were collected.•Plants from primed and non-primed seeds were submitted to a second water stress.•Plants from primed seeds showed higher yield, antioxidant activity and Δ13C.•Long-term water stress memory occurred mainly in improved potato varieties. Knowledge of drought tolerance in potato is limited and very little is known about stress memory in this crop. In the present study, long-term stress memory was tested on tuber yield and drought tolerance related traits in three potato varieties (Unica, Désirée and Sarnav) with contrasted yields under water restriction. Seed tubers produced by plants grown under non-restricted (non-primed tubers) and restricted (primed tubers) water conditions were sown and exposed to similar watering treatments. Tuber yield and leaf greenness of plants from primed and non-primed seeds as well as tuber carbon isotope discrimination (Δ13C) and antioxidant activity (AA) responses to watering treatments were compared. Higher tuber yield, both under non-restricted and restricted water regimes, was produced by primed Sarnav plants. The decrease of tuber yield and Δ13C with water restriction was lower in primed Unica plants. Long-term stress memory consequently appears to be highly genotype-dependent in potato. Its expression in plants originated from primed tubers and facing water restriction seems to be positively associated to the degree of inherent capability of the cultivar to yield under water restriction. However, other effects of priming appear to be genotype-independent as priming enhanced the tuber AA in response to water restriction in the three varieties.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0168-9452 1873-2259
DOI:	10.1016/j.plantsci.2015.05.016