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- W2355138056 abstract "Myxospermy, a mechanism, where mucilage is produced upon being moistened, has been found in many species, and is frequently associated with species occurring in arid zones. There has been, however, little study on myxospermy with reference to rainfall amount. To analyze the ecological significance of myxospermy, a comparison was made with regard to mucilage producion and the capacity to hold sand particles of the achenes of 5 Artemisia species, i.e., Artemisia frigida, A. halodendron, A. sieversiana, A. scoparia and A. wudanica under different rainfall treatments. In the experiment, achenes were buried in a depth of 5mm, 1, 2, 4 and 8 mm water was added to simulate different rainfall amount. The amount of mucilage was judged by means of the capacity to hold sand particles. All species included were proved to have mucilaginous achenes. When the rainfall was 1 mm, achenes of the 5 species in the experiment began to produce mucilage. When the rainfall was 2～4 mm, the mean weight of the sand held by a single achene of the typical psammophytes, A. wudanica and A. halodendron was 7.31～13.56 mg and 0.63～2.55 mg, respectively. Except A. frigida, other 4 species exhibit a general trend that mucilage increased with rainfall rising. The descending order of the proportion of mucilaginous achenes was as A. frigida, A. wudanica, A. halodendron, A. sieversiana and A. scoparia. Under the different rainfall treatments, the descending order of the sand amount held by mucilaginous achenes showed the trend as Artemisia wudanica, A. halodendron, A. sieversiana, A. frigida and A. scoparia. After producing mucilage and adhering sand upon moistening, compared to achene weight, weight of the achene-sand conglomeration of A. frigida increased by 4～6 times, A. halodendron 1～8 times,A. sieversiana 2～4 times,A. scoparia 4～7 times and A. wudanica 4～28 times. The experiment showed that, achenes of pioneering species on sand dunes, A. wudanica and A. halodendron, had bigger capacity to hold sand particles after producing mucilage than other species, and much sand was held by the mucilaginous achene of these two species when only 2～4 mm rainfall occurred,meaning that the ability to produce mucilage from achenes upon being moistened is one of the adaptations of Artemisia species to shifting sand." @default.
- W2355138056 created "2016-06-24" @default.
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- W2355138056 date "2005-01-01" @default.
- W2355138056 modified "2023-09-25" @default.
- W2355138056 title "Comparison of mucilage produced by achenes of 5 Artemisia species under different rainfall treatments" @default.
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