水生蕨类植物Salvinia natans的浮叶和沉叶对N、P和K的吸收

IF 0.9 4区 生物学 Q4 PLANT SCIENCES Botanica Serbica Pub Date : 2022-01-01 DOI:10.2298/botserb2202253a
L. Adamec
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引用次数: 0

摘要

衰老叶片和芽的养分吸收减少了与生物量周转有关的养分损失,是矿质养分经济的重要组成部分。在沉水植物中,衰老叶片或芽对N和P的吸收效率(REN, REP)很高(干重DW >40%),但对K的吸收效率(REK)通常很低或为零。自由漂浮水生蕨类Salvinia natans具有线性模块化的茎结构,具有陡峭的生长和生理极性,由具有光合作用的椭圆形漂浮游动叶片和吸收营养的线状水下叶片组成。为了获得基本的矿质养分特征,在室外培养中对该树种的衰老浮叶和沉叶进行了REN、REP和REK的估算。所有叶片的N含量在1.10 ~ 1.42% DW之间,P含量在0.33 ~ 0.57% DW之间,K含量在4.03 ~ 6.20% DW之间,表明叶片部分受氮生长限制,但磷吸收较为自由。与预期相反,两种叶片的REN值都相对较低(7-31%),REP值甚至为负(-7 ~ -12%),而REK值相对较高(31-44%)。这些结果与淹没植物和类似的热带物种S. molesta报道的高得多的N和P吸收效率形成对比。在海苔中发现的REK值与在海苔中发现的REK值一致,但远高于在水下植物中发现的REK值。因此,就K经济而言,Salvinia物种的沉叶(根茎叶)的行为与高等沉叶植物的叶片不同。
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Resorption of N, P and K from the floating and submerged leaves of the aquatic fern Salvinia natans
Nutrient resorption from senescing leaves and shoots decreases the nutrient losses associated with biomass turnover and represents a significant component of mineral nutrient economy. In submerged aquatic plants, N and P resorption efficiencies (REN, REP) from senescing leaves or shoots are high (usually >40% in dry weight, DW), but K resorption efficiency (REK) is usually very low or zero. The free-floating aquatic fern Salvinia natans has a linear, modular shoot structure exhibiting steep growth and a physiological polarity, and consists of oval, floating, natant leaves with photosynthetic functions and thread-like submerged leaves which absorb nutrients. To obtain the basic mineral nutrient characteristics, REN, REP and REK were estimated in the senescent floating and submerged leaves of this species grown in an outdoor culture. The N content in all the leaves was in the range between 1.10-1.42% DW, P 0.33-0.57% DW and K between 4.03-6.20% DW, indicating a partial N growth limitation but a liberal P uptake. Contrary to expectations, the REN values in both types of leaves were relatively low (7-31%), those of REP even negative (-7 to -12%), while the REK values were relatively high (31-44%). These results are in contrast to much higher N and P resorption efficiencies reported in both submerged plants and the similar tropical species S. molesta. The REK values found in S. natans are in accordance with those reported in S. molesta, but are much higher than those in submerged plants. Thus, the submerged leaves (rhizophylls) of the Salvinia species do not behave in the same way as the leaves of higher submerged plants in terms of the K economy.
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来源期刊
Botanica Serbica
Botanica Serbica Agricultural and Biological Sciences-Plant Science
CiteScore
1.40
自引率
12.50%
发文量
17
审稿时长
34 weeks
期刊介绍: Botanica Serbica publishes original research papers on all aspects of plant, fungal and microbial biology research including the disciplines of microbiology, mycology, lichenology, bryology, flora, vegetation, biogeography, systematics, taxonomy, plant biotechnology, plant cell biology, plant ecology, environmental plant biology, forestry, genomics, horticulture, limnology, metabolomics, molecular biology, proteomics, virology, plant conservation and protection, and wildlife and ecosystem management.
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