1 23 Acta Physiologiae Plantarum ISSN 0137-5881 Volume 36 Number 1 Acta Physiol Plant (2014) 36:161-167 DOI 10.1007/s11738-013-1396-5 Effect of d-mannose on antioxidant defense and oxidative processes in etiolated wheat coleoptiles Amjad Hameed, Nayyer Iqbal & Salman A. Malik