Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, Yangling-712100, China; Colloge of Resources and Environment, Northwest Sci-Tech University of Agriculture and forestry, Yangling, Shaanxi 712100, China; Japan International Research Center for Agricultural Sciences, Tsukuba-3508686, Japan; Graduate School, Chinese Academy, Beijing 100039, China.
Abstracts, II Chinese Allelopathy Conference, November 3–5, 2005. Agricultural University, Hangzhou, China. Pp. 26, (2005).
Allelopathic suppression of weeds and high yield was our main objective. We studied the genetic variations in allelopathic potential, its Gray Correlation with important agronomic traits and the Rank analysis on allelopathic stability of 15 wheat accessions grown in arid regions of the loess Plateau. The genetic variation of allelopathic property in dryland winter wheat showed a significant difference. In the whole life, wheat allelopathy exhibited a strong heredity of 55.22–94.87%, the strongest and weakest allelopathic heredity appeared at the tillering stage and the milk stage respectively. The Gray Correlation analysis showed close relation between the allelopathic traits which depended on growth phase and agronomic traits. Allelopathic expression induce a dominant effect on some important agronomic characters reflecting wheat yied. The multiple linear regression relation was built between allelopathic potential in diffenert growth periods and agronomic characters persued in the wheat breeding. When the allelopathic intensity varied from 0 to 1 in the vegetative stages the important agronomic characters viz., plant height, spike length, number of seeds per spikelet and the 1000-seeds weight were 43.60–108.37cm, 6.44–9.16cm, 13.43–21.00, 41.45–50.27g respectively. Triticum aestivum var No 6 Lankao and No 22 Xiaoyan were identified as stable and stronger allelopathic accessions, whereas Lankao 95 was the weakest allelopathic cultivar.
