Abstract
Waterlogging is one of the most important environmental stresses that have negative effects on wheat growth and yield. The purpose of this study was to investigate the effect of waterlogging (0, 7, 14 and 21 d) at tillering (ZG21) and stem elongation (ZG31) stages on the content of photosynthetic pigments, proline, malondialdehyde (MDA), antioxidant enzymes, grain yield and yield components of three wheat promising lines (N-93-19, N-93-9 and N-92-9). Increasing waterlogging stress reduce the photosynthetic pigments contents and the activity of catalase enzyme while increase the proline content, MDA, superoxide dismutase and peroxidase enzymes in three wheat genotypes in both tillering and stem elongation stages. Waterlogging also reduced yield and yield components in three wheat genotypes. The results showed that N-92-9 genotype had better response than other two genotypes in all studied traits under waterlogging conditions.
Highlights
Waterlogging, which is due to poor drainage of the soil under inappropriate irrigation practices or heavy rainfall, is one of the abiotic stresses and considered as one of the main limitation factors for the growth and yield of crops
In tillering and stem elongation stages, waterlogging treatments reduced the content of chlorophyll a and b in all three wheat genotypes
53.61 %, in N-92-9 genotypes by 11.03, 15.86 and 28.96 % under treatment of 7, 14 and 21 d waterlogging, respectively as compared to the corresponding controls (Fig 3 A). 7 d waterlogging in stem elongation stage reduced carotenoids in all three wheat genotypes, but there was no significant difference between the three wheat genotypes. 14 d waterlogging treatment reduced carotenoids contents in N-93-19, N93-9 and N-92-9 by 49.14, 35.5 and 32.15 %, respectively, as compared to the corresponding controls (Fig 3 B)
Summary
Waterlogging, which is due to poor drainage of the soil under inappropriate irrigation practices or heavy rainfall, is one of the abiotic stresses and considered as one of the main limitation factors for the growth and yield of crops. Under flooding conditions, excess water around the root reduces gas. The closure of the stomata to prevent water loss along with the adjustment of photosynthetic apparatus is one of the main responses of the plant under waterlogging stress (Arbona et al, 2008). Under environmental stresses, antioxidant defense systems play an important role in plant tolerance to stress. Van Toai and Bolles (1991) showed that high SOD activity with superoxide detoxification could help tolerate the plant under flood stress In various studies, increased activity of antioxidant enzymes has been reported under various environmental stresses (Kumutha et al, 2009; Amador et al, 2012; Gerami et al, 2018). Van Toai and Bolles (1991) showed that high SOD activity with superoxide detoxification could help tolerate the plant under flood stress
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