Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (20): 4141-4148.doi: 10.3864/j.issn.0578-1752.2012.20.003

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

Difference in Root Structure and Respiration Metabolism Between Two Maize Cultivars Under Waterlogging Stress

 SENG  Shan-Shan, WANG  Qun, LI  Chao-Hai, LIU  Tian-Xue, ZHAO  Long-Fei   

  1. 1.河南农业大学农学院/河南省粮食作物生理生态与遗传改良重点实验室，郑州 450002
  • Received:2012-05-23 Online:2012-10-15 Published:2012-07-31

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Abstract: 【Objective】The objective of this study was to identify the difference in root structure and respiration metabolism between two maize cultivars under waterlogging stress in seedling growth.【Method】A pot experiment with two maize cultivars DH662 (a susceptible maize genotype) and XD20 (a tolerant one) was conducted at scientific and educational campus of Henan Agricultural university. CK and 2, 4, 6, 8 days of waterlogging were designed for the two cultivars. The differences in root structure and respiration metabolism between two cultivars were studied. 【Result】The results showed that the root dry weight, root length, root activity of two cultivars decreased with the increase of waterlogging days. And the decreases in DH662 were more significantly than in XD20. The root dry weight in DH662 and XD20 decreased by 29.7% and 12.1%, while root activity decreased by 30.6% and 8.7% as compared with CK treatment after 8 days of waterlogging. The number of aerenchyma, the aerenchyma area and the porosity of two cultivars increased with the increase of waterlogging days. The average aerenchyma area and root porosity of two cultivars increased by 3.9 times and 2.8 times than CK treatment after 6 days of waterlogging. The average activity of alcohol dehydrogenase, pyruvate decarboxylase and lactate dehydrogenase in two cultivars increased by 27.7%, 55.0% and 2.6 times than CK treatment. And the increases in DH662 were more significantly than in XD20. 【Conclusion】Different cultivars had different responses mechanism in their tolerance to waterlogging in seedling growth. A tolerant maize cultivar had intact root structure, higher root activity and developed aerenchyma. And the anaerobic respiration was moderate. So the tolerant maize cultivar could resist waterlogging stress and increase root dry weight.

Key words: maize, waterlogging, anaerobic respiration enzymes, aerenchyma, porosity

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