Loss of Maize Seed Vigor as Affected by Biochemical Changes during Hydropriming
- Papassorn Wattanakulpakina,
- Songsin Photchanachai a,
- Shuichi Miyagawab and
- Khanok Ratanakhanokchaia
- a School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, 49 Soi Thian Thale 25, Bang KhunThian Chai Thale Rd., Tha Kham, Bang KhunThian, Bangkok 10150, Thailand
b Division of Applied Biological Science, Faculty of Applied Biological Science, Gifu Univ., 1-1 Yanagido, Gifu 501-1193, Japan
Hydropriming has both positive and negative effects on seed performance. Hydropriming (for 6 to 30 h) was performed in the maize (Zea mays L.) seed lines ‘TSK 11’ and ‘PS 54’. A short hydropriming time of 6 to 12 h improved seed germination in both lines. An improvement in seed vigor, as investigated by germination after accelerated aging, was observed after hydropriming for 6 and 12 h in ‘TSK 11’ seeds, but only after 6 h of hydropriming in ‘PS 54’. The reduction in seed vigor occurred faster in ‘PS 54’ than in ‘TSK 11’, which was confirmed at hydropriming times of 12 and 18 h, respectively. The higher activities of antioxidant enzymes, that is, superoxide dismutase (SOD) and ascorbate peroxidase (APX) in ‘TSK 11’, and SOD, peroxidase (POD), and APX in ‘PS 54’, correlated with enhanced maize seed vigor after priming. The deterioration of primed maize seeds was linked to the process of lipid peroxidation, indicated by the generation of malondialdehyde during imbibition, and acetaldehyde and ethanol during redrying. Additional indicators were identified: a reduction in the antioxidant activities of SOD, CAT, and APX for ‘TSK 11’, and SOD and CAT for ‘PS 54’, decreased raffinose content, and increased amylase activity. A less compact cellular ultrastructure was observed in hydroprimed seeds and was associated with seed deterioration. The different responses in physiological and biochemical attributes induced by hydropriming were related to their genotype and partially affected by the initial characteristic differences between the two maize lines causing different maize seed appearance.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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