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Growth, physiology, and abiotic stress response to abscisic acid in tomato seedlings

  • Ngoc-Thang Vu
  • Ho-Min Kang
  • Young-Shik Kim
  • Ki-Young Choi
  • Il-Seop Kim
Research Report Cultivation Physiology

Abstract

The effect of abscisic acid (ABA) on growth, abiotic stress tolerance, and physiology of tomato seedlings was investigated. To examine the effect of ABA concentration on growth and abiotic stresses, six ABA concentrations (0, 10, 50, 100, 150, or 200 mg·L-1) were applied by foliar spraying once a day for 10 days. The effect of ABA application number was also studied by using different timing at one ABA concentration (100 mg·L-1) once a day for 1, 3, 5, 7, and 9 days. The effect of ABA on physiology of tomato seedlings was examined by using two concentrations (50 and 100 mg·L-1) as compared to the control (non-ABA). Foliar application of ABA decreased the growth characteristics of tomato seedlings in a concentration-dependent manner; however, no statically significant difference was observed between the 50 and 100 mg·L-1 treatments. Furthermore, although growth parameters decreased statistically with increasing number of ABA treatments, there was no difference between the 3 and 5 application treatments. Application of ABA enhanced stress tolerance (cold and drought) of tomato seedlings by delaying the starting time of wilting point in drought conditions and reducing the relative ion leakage and chilling injury index in low temperature in all treatments. The transpiration rate decreased significantly, while stomatal diffusive resistance increased significantly with increasing ABA concentration. The relative water content decreased significantly during the period without irrigation. However, relative water content increased with increasing ABA concentration. The ABA enhanced drought tolerance of tomato seedlings by delaying the start time of wilting point from day 3 in the control to day 5 and 7 in the 50 and 100 mg·L-1 treatments, respectively. Integrating this result data, we can determine the ABA’s ability to maintain of seedling quality at low temperature and water deficit condition.

Additional key words

chilling injury ion leakage transpiration rate water content wilting point 

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Copyright information

© Korean Society for Horticultural Science and Springer-Verlag GmbH 2015

Authors and Affiliations

  • Ngoc-Thang Vu
    • 1
  • Ho-Min Kang
    • 1
  • Young-Shik Kim
    • 2
  • Ki-Young Choi
    • 3
  • Il-Seop Kim
    • 1
  1. 1.Department of HorticultureKangwon National UniversityChuncheonKorea
  2. 2.Department of Plant and Food ScienceSangmyung UniversityCheonanKorea
  3. 3.Department of Controlled AgricultureKangwon National UniversityChuncheonKorea

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