Influence of light and nitrate assimilation on the growth strategy in clonal weed <Emphasis Type="Italic">Eichhornia crassipes</Emphasis> |
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Authors: | Weiguo Li Jianbo Wang |
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Institution: | (1) Key Laboratory of MOE for Plant Developmental Biology, College of Life Sciences, Wuhan University, 430072 Wuhan, Hubei, China;(2) Institute of Resource and Environment, Henan Polytechnic University, 454000 Jiaozuo, Henan, China; |
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Abstract: | We studied as to how the inter-connected modular architecture of clonal Eichhornia crassipes allows nutrient to transfer from established ramets to developing ramets, and nitrate translocation within clonal system
and how such a strategy may play an important role in successful establishment and expansion of this clonal plant. Using this
stoloniferous E. crassipes as a model, we studied the effects of light and nitrate availability on growth and nitrate assimilation in inter-connected
parent and offspring ramets. Our results showed that increase in light and nitrate availability significantly increased growth
rate of the whole clonal fragments and reproduction of offspring ramets in E. crassipes. In addition, increases in nitrate reductase (NR) activity and glutamine synthetase (GS) activity were observed in both parent
and offspring ramets with increase in light density and nitrate supply. We also found that nitrate translocation is greater
in offspring ramets than in parent ramets under abundant light and nitrate environment in this fast-growing clonal plant.
Consequently, majority of nitrate assimilation in offspring ramets is beneficial to the growth of whole clonal system, as
indicated by a close correlation between nitrate assimilation in offspring ramets and RGR of whole clonal fragments. We strongly
contend that nitrate translocation and assimilation within clone system is important for efficient utilization of nitrogen
in alien clonal plant E. crassipes during establishment and expansion, and thus for increase in its invasiveness in natural water columns. |
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