Chin J Plant Ecol ›› 2009, Vol. 33 ›› Issue (1): 134-140.DOI: 10.3773/j.issn.1005-264x.2009.01.015

• Research Articles • Previous Articles     Next Articles

EFFECTS OF WATERLOGGING STRESS ON MORPHOLOGY AND PHYSIOLOGY OF CAMPTOTHECA ACUMINATA

WANG Gui-Bin(), CAI Jin-Feng, HE Xiao-Hua   

  1. College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China
  • Received:2007-12-11 Accepted:2008-06-20 Online:2007-12-11 Published:2009-01-30

Abstract:

Aims Camptotheca acuminate is a common tree species in southern and eastern China. It is planted widely as a virescence species and is cultivated as an officinal species, because its seed, leaf and stem can be used to distill camptothecin, which is used to treat cancer. Our objective was to examine C. acuminate’s resistance to waterlogging.
Methods One-year seedlings of C. acuminata were grown in pots in a greenhouse in January, and we implemented four treatments in May: CK (common soil water content), A (water level 10 cm under soil surface), B (water level equal with soil surface) and C (water level 4 cm above soil surface). Treatments lasted 21 days, and indexes of lenticels, root growth, root vigor, POD, SOD, MDA and LDH were determined at different times after treatment.
Important findings Root growth was better in A and CK treatments, and roots gradually died in B and C treatments. Comparatively, root vigor was higher in A and decreased gradually under B and C with treatment time. Many lenticels were observed on the stem under B and C, but not under CK and A. The POD and SOD activity of leaves of A treatment were higher during treatment, but increased and then decreased under B and C treatments. The production rate of O2, H2O2 content and MDA content of leaves of A, B and C treatments increased gradually with treatment time, but was higher under C and B treatments. The LDH activity of roots in A, B and C treatments was lower early in treatment, but increased significantly late in treatment. We conclude that C. acuminata grows well in lightly waterlogged sites, but not in waterlogged and flooded sites.

Key words: Camptotheca acuminata Decne, waterlogging stress, morphology, physiology