|
| Effect of shading treatments on growth and physiological characteristics of Drepanostachyum luodianense |
| |
| DOI： |
|
| Hits: 1449 |
| Download times: 811 |
| Abstract: |
| In order to investigate shade tolerance of endangered plant Drepanostachyum luodianense, three shading treatments of low shading (LS, the relative light intensity was 74.32%), moderate shading (MS, the relative light intensity was 44.83%) and severe shading (SS, the relative light intensity was 18.57%) were set up to observe the leaf growth and physiological characteristics of D. luodianense,
with natural light as the contrast (CK, the relative light intensity was 100%). The results showed that袁compared with CK, there was no significant difference for the specific leaf weight, soluble protein content, soluble starch content, soluble sugar content and free proline content of D. luodianense under LS, except that the leaf relative number significantly increased, the total chlorophyll content, carotenoids content and relative content of chlorophyll b increased slightly as well. Also under MS (or SS)袁the leaf relative number, total chlorophyll content, carotenoids content, relative content of chlorophyll b and soluble protein content of D. luodianense significantly increased relative to CK, while the specific leaf weight, soluble starch content and free proline content decreased significantly, but with no significant difference in soluble sugar content. These results indicated that D. luodianense could well adapt to low shading environment and moderate shading conditions was more advantageous to the growth and development. In the further aggravating shading environment, D. luodianense enhanced illumination intercepted area and light absorptive capability by reducing the specific leaf weight, promoting the expansion growth and raising the total chlorophyll especially the chlorophyll b content; maintained normal cell turgor by regulating the free proline content; used more energy to keep normal life activities by decreasing the net accumulation of photosynthetic organics; strengthened capability against low light stress by holding enough soluble sugar and improve the soluble protein content. Therefore, we deduce that D. luodianense has strong adaptability to moderate shading and severe shading environment. |
|
View Full Text
View/Add Comment Download reader |
|
|
|
