期刊
AUSTRALIAN JOURNAL OF BOTANY
卷 65, 期 1, 页码 1-10出版社
CSIRO PUBLISHING
DOI: 10.1071/BT16154
关键词
amorphous silica; biomineralisations; coastal soils; silicophytoliths; tussock grasses; xeromorphic anatomy
资金
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 1583/13]
- Universidad Nacional de Mar del Plata [EXA 643/13, EXA 741/15]
Amorphous silica accumulation in grasses is widely described in numerous species; however, work done in relation to the factors affecting this accumulation in the tissues and different type of cells, is still incipient. Here, we analysed a perennial tussock grass, Cortaderia selloana (Schult. & Schult.f.) Asch. & Graebn. (Pampas grass), a native and widely spread species from South America, which is also considered an invasive plant in many regions of the world. We analysed the relation between silicification process, soil type and environment, and anatomical features. Silicophytolith content and distribution in plants was analysed through calcination and staining techniques and SEM-EDAX analyses. Silicophytolith content was higher in leaves (2.48-5.54% DW) than in culms (0.29-0.43% DW) and values were similar to other tussock grasses. A relationship between the habit of a grass species and the potential maximum content of amorphous silica is suggested. Plants grown in soils from modified environments with high silica content (Anthrosol and Tecnosol) produced a higher content of amorphous silica. In leaves, the distribution of silicified cells was conditioned by leaf xeromorphic features. Soil Si content and environmental conditions (radiation, disturbance) are more relevant in silicification process than phenological factors. Within leaves, the accumulation of amorphous silica is conditioned by anatomy and transpiration.
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