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Abstract Detail

Biotic and abiotic stress

Banik, Pankaj Kumar [1].

Effects of drought acclimation on drought stress resistance in potato (Solanum tuberosum) genotypes.

The effects of drought acclimation on drought stress resistance in three potato genotypes [‘Fv12246-6’ (Fv), ‘Vigor’ (V) and ‘Russet Burbank’ (RB)] in a low relative humidity greenhouse were examined. Non-Acclimated and Non-Stressed (NA), Non-Acclimated and Drought Stressed (NAS), Drought Acclimated and Drought Stressed (DAS) treatments were applied. Tuber yield and number were genetically determined; drought acclimation and drought stress had no effect on these components. However, water conservation mechanisms based on leaf and stem characteristics were both genotype and treatment-dependent. When leaves were drought stressed while attached to the stem, genotype V and RB maintained a higher percentage of leaf water content (%LWC) than Fv, likely from the greater water stored in their stems that may have been delivered through continued leaf transpiration. Fv was the most sensitive potato genotype, displaying the highest degree of leaf wilting and lowest %LWC under drought stress. The observed drought stress-induced smaller stomata in Fv did not confer greater resistance. In addition, Fv displayed the lowest percentage stem water content (%SWC) and slowest recovery time after drought stress. RB underwent the fastest recovery from drought stress, possibly due to its equivalent xylem to pith ratio which might have enhanced greater water uptake in RB than in V and Fv. Finally, compared to application of drought stress directly (NAS), a pre-treatment of drought acclimation cycles followed by drought stress (DAS) reduced leaf wilting, induced thicker cuticular layer, more open stomata under stress and greater stem number. Without a DAS approach, potentially key drought stress resistance mechanisms will be missed. The role of the stem as a potential water reservoir to adapt against drought stress should also be examined to further identify critical elements for drought stress survival and recovery.

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1 - The University of Saskatchewan, Plant Sciences, Unit 303 , 105 Cumberland Avenue South, Saskatoon, Saskatchewan, S7N 1L7


Presentation Type: Oral Paper:Papers for Topics
Session: 7
Location: Salon 13/14/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 9:30 AM
Number: 7007
Abstract ID:1336
Candidate for Awards:None

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