Abstract:Abstract: Spirodela polyrhiza strain DW2501-4 collected from Lingshui, Hainan was used to study turion-mediated reproduction. Results showed that new fronds reproduced continually in half-strength Hoagland′s solution until nutrition was scarce. Dormant organ called turion was then formed. The turions were collected and cold-treated for one week at 4 ℃, and were transfered into half-strength Hoagland′s solid medium with 1% sucrose, and incubated at 24 ℃. The turions germinated in 3 days. Paraffin sections of the fronds, turion-like fronds, and turions were prepared to observe their anatomical structures. Results indicated that fronds had several veins and a small amount of starch grains in the cells, and were full of air chambers. The air chambers in the upper layer were small while the air chambers in the bottom layer were big. Turion-like fronds contained a few veins and some small air chambers, and a lot of starch grains in their cells. Veins and air chambers were not observed in turions. A lot of starch grains were observed in turion cells, and some cells were observed to contain high level of tannin. During germination of turion, the starch grains were digested and became smaller and smaller, and roots and new fronds were formed.
引用本文:
李兰芝, 张家明. 紫萍营养繁殖过程的解剖观察[J]. 生命科学研究, 2016, 20(4): 314-319.
LI Lan-Zhi, ZHANG Jia-Ming. Anatomical Studies on Turion-mediated Reproduction in Spirodela polyrhiza. Life Science Research, 2016, 20(4): 314-319.