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Poplar
2012, Issue 189-190, p. 29-38

Original scientific paper
UDC: 582.681.81:628.1

Recovery Responses of Photosynthesis, Transpiration, and WUE in Black Poplar Clones following Water Deficits


Mirjana Topić 1*, Milan Borišev 1, Milan Župunski 1, Marina Tomičić 2, Nataša Nikolić 1, Slobodanka Pajević 1, Borivoj Krstić 1, Andrej Pilipović 3


1 University of Novi Sad, Faculty of Sciences, Novi Sad, Serbia
2 Institute of Field and Vegetable Crops, Novi Sad, Serbia
3 University of Novi Sad, Institute of Lowland Forestry and Environment, Novi Sad, Serbia

Corresponding author:
Mirjana Topić, E-mail: mimatopic@gmail.com


Abstract

Five black poplar (Populus nigra L.) genotypes were grown in a semi-controlled environment and were subjected to three different soil water regimes: control (90-70% of maximal field capacity-FC), drought followed by recovery of optimal soil water saturation (90-40% of FC) and permanent drought treatment (50-40% of FC). Variation in leaf gas exchange parameters such as photosynthetic (P) and transpiration intensity (T), as well as water use efficiency (WUE) were investigated among genotypes in their response to water deficit and recovery from drought. Recovery of soil water field capacity from 40% to 90% determined restored values of P, T and WUE. After 16 days of permanent drought (50-40% FC), strong decline of all parameters among examined genotypes was determined. Overall, significant differences among genotypes in leaf gas exchange parameters were found, which can give some indications of superiority of certain genotypes in relation to drought stress.


Keywords: Populus nigra L., genotypes, drought stress, recovery
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