FIGURE 4 Effects ofElymus nutans extracts on germination of highland grasses. Values
are mean ± SD(n=5). Different letters denote significant differences
between treatments with a > b > c
> d, the same below.
The root growth of drooping wildryegrass and Siberian wildryegrass was
significantly inhibited by the three kinds of extracts, and the
differences among extract treatments were not significant (Figure 5a).
The effects of the three extracts
on the root length of Chinese fescue, Kentucky bluegrass and crymophila
bluegrass exhibited similar pattern, i.e. pieces extracts
and root zone soil extracts
presented stronger inhibition than whole extracts, but a slight
difference in Kentucky bluegrass.
Except for Kentucky bluegrass, the three kinds of extracts significantly
affected hypocotyl length of other four donor grasses (Figure 5b). The
pieces extracts exhibited the strongest shoot growth inhibition on
Chinese fescue, crymophila bluegrass, Siberian wildryegrass and drooping
wildryegrass , and resulted in shoot length reduction by 42.9%, 31.1%,
21.0% and 25.6%, respectively.
The overall influence of different treatments on seedling dry weight of
donor grasses was inhibition, varied with grasses and extracts (Figure
5c). The pieces extracts lead to significant seedling dry weight
decrease of Chinese fescue, crymophila bluegrass, Kentucky bluegrass,
Siberian wildryegrass and drooping wildryegrass with 42.9%, 34.7%,
30.2%, 27.1% and 26.9%, respectively. The root zone soil extracts
presented similar effects of pieces extracts on Kentucky bluegrass, but
similar effects of whole extracts on other four grasses.