A hydroponic experiment was carried out to study genotypic differences in effect of Al and Cd on growth and antioxidant enzyme activities by using 2 two-row winter barley genotypes (Hordeum vulgare L.) with different Al resistance, the relatively resistant Gebeina and the sensitive Shang 70-119. The seedling growth, presented as shoot height, root length and dry weight of root and shoot, and tillers per plant were inhibited by all stress treatments, including low pH, 100 μM Al (pH 4.0) and 1.0 μM Cd+100 μM Al (pH 4.0), while 1.0 μM Cd showed a slight stimulation of growth. The inhibition was more severe in 1.0 μM Cd +100 μM Al (pH 4.0) than in 100 ΑM Al (pH 4.0), indicating that the effect of Cd and Al is synergistic. Al-sensitive genotype Shang 70-119 was more inhibited than Al-resistant genotype Gebeina. Proline concentration in leaves was significantly increased when plants were exposed to all stress treatments, being more pronounced in Shang 70-119 than in Gebeina. A highly significant increase in malonaldehyde (MDA) concentration, and a stimulation of superoxide dismutase (SOD) and peroxidase (POD) activities were recorded in the plants subjected to low pH, 100 μM Al (pH 4.0) and 1.0 μM Cd +100 μM Al(pH 4.0) treatments, and the extent of the increase varied greatly depending on concentration and time of exposure. Shang 70-119 had a higher MDA concentration, and less increase in SOD activity when first exposed than Gebeina had.

Item Type:	Refereed Article
Research Division:	Agricultural and Veterinary Sciences
Research Group:	Crop and Pasture Production
Research Field:	Crop and Pasture Improvement (Selection and Breeding)
Objective Division:	Plant Production and Plant Primary Products
Objective Group:	Winter Grains and Oilseeds
Objective Field:	Barley
UTAS Author:	Zhou, M (Professor Meixue Zhou)
ID Code:	29244
Year Published:	2004
Web of Science® Times Cited:	99
Deposited By:	Agricultural Science
Deposited On:	2004-08-01
Last Modified:	2011-11-24
Downloads:	0