Mitteilungen der Gesellschaft für Pflanzenbauwissenschaften Band 23

147
allelochemicals. Inhibition or delay of seed germination and root growth by allelochemicals
from oil seed rape and wheat were reported also by Batish et al. (2001).
a
Germination rate (%)
100
80
60
40
20
0
0 1 5 10
Concentration (%)
LSD=25,95
Oil seed rape
Wheat
b
100
Germination rate (%)
80
60
40
20
0
LSD=23,16
0 1 5 10
Concentration (%)
Fig. 1: Effects of different concentration of (a) oil seed rape extract on oil seed rape
and wheat seeds and (b) wheat extracts on both seeds on average
Seedling growth: The analysis of variance indicated a significant difference for oil
seed rape and wheat extracts among concentrations and seeds (Table 1). Both
extracts significantly reduced R seedling growth while W seedling growth was
increased by the 1% extracts and decreased with higher extract concentrations. Oil
seed rape seedlings were stronger affected by extract addition than wheat seedling.
Shoot lengths of oil seed rape and wheat were significantly reduced by the highest
concentration of the oil seed rape extract (10%). Applying wheat extracts to oil seed
rape or wheat seeds had no effect on either shoot length. The results show that root
elongation was affected more than shoot elongation. This might be due to more
intensive contact of roots with the extract and consequently with inhibitory chemicals
(Jafariehyazdi and Javidfar, 2011).
Table 1: Effect of different concentrations of two extracts on seedling growth
Extract Concentration (%) Root length (cm) Shoot length (cm)
R seedling W seedling R seedling W seedling
Rape
0
1
4.59 a
1.61 b
8.28 b
11.14 a
1.23 a
1.57 a
8.30 a
8.63 a
5 0.65 c 8.37 b 1.42 a 7.96 a
10 0.00 c 4.63 c 0.00 b 5.85 b
LSD 0.67 1.77 0.34 1.55
0 4.59 a 8.28 b 1.23 ns 8.30 ns
Wheat
1
5
1.65 b
1.60 b
11.71 a
10.55 ab
1.52 ns
2.03 ns
8.23 ns
11.42 ns
10 1.09 b 8.76 b 1.28 ns 8.83 ns
LSD 1.28 2.57 0.88 4.01
References
Batish, D.R., H.P. Singh, R.K. Kohli, S. Kaur 2001: Crop allelopathy and its role in ecological
agriculture. Journal of Crop Production 4:124-131.
Jafariehyazdi, E., F. Javidfar 2011: Comparison of allelopathic effects of some Brassica species in two
growth stages on germination and growth of sunflower: Plant Soil Environment 57:52-56.
Saffari, M., M.H. Torabi-Sirchi 2011: Allelopathic effects of straw extract from two native Iranian wheat
varieties (single cross 647, 704). American-Eurasian J. Agric. & Environ. Sci. 10:133-139.