Effects of sulphur supply on the morphology of shoots and roots of alfalfa (Medicago sativa L.)

被引:22
作者
Wang, YF
Wang, SP [1 ]
Cui, XY
Chen, ZZ
Schnug, E
Haneklau, S
机构
[1] Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China
[2] FAL, Inst Plant Nutr & Soil Sci, Braunschweig, Germany
关键词
sulphur; alfalfa; shoot and root morphology; pot experiment;
D O I
10.1046/j.1365-2494.2003.00366.x
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
A sulphur (S)-deficient top soil was used in a pot experiment to investigate the effect of S supply on shoot and root growth and development in alfalfa (Medicago sativa L.). The treatments consisted of three rates of addition of S: 0, 20 and 40 mg kg(-1) soil and each was replicated four times. Alfalfa was harvested at 15, 30, 45, 60 and 75 d after seedling emergence. By the end of the experiment, plants with S supply had a significantly larger leaf area, heavier leaf, shoot and root dry weight per pot than controls. The effects of adding S also significantly increased plant height, basal stem diameter, chlorophyll concentration of young leaves, root length and root surface area compared with controls. The effects of S were greater on shoots than on roots. The ratio of root to shoot dry weight was 0.47 when S was supplied and 0.88 without added S, indicating that c. 0.32 and 0.47 of the total net photosynthate, produced with or without S supply, respectively, were used for the development of roots. Overall, overcoming S deficiency resulted in a significant increase in shoot and root growth.
引用
收藏
页码:160 / 167
页数:8
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