ABSTRACT
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Plants in amenity horticulture are frequently exposed to environmental conditions without any protection, which can induce physiological stress and adversely affect their growth and appearance. Over the last few decades, many reviews have been published on how plant species respond to different environmental stress factors including drought (Munns and Tester, 2008; Farooq et al., 2009; Riaz, 2010; Riaz et al., 2010; Ricardo, 2012), salinity (Flowers et al., 1977; Greenway and Munns, 1980; Läuchli and Grattan, 2007; Munns, 2011; Nadeem et al., 2012), temperature extremes (Krasensky and Jonak, 2012), and pollution (Bell et al., 2011). From these reviews, it is evident that important advances are being made in understanding the fundamental mechanisms by which plants adapt to stress, while at the applied level, considerable effort is being devoted to the search for ef- cient screening methods for the identication of stress-resistant genotypes. Germplasm so identied can ultimately be used for breeding and development of stress-resistant landscape plants (Steve and Harold, 2000; Martin, 2004).
