Abstract
Chinese fir is a tall, fast-growing species that is unique to southern China. In Chinese fir plantations, successive plantings have led to a decline in soil fertility, and aluminum toxicity is thought to be one of the main reasons for this decline. In this study, Non-invasive Micro-test Technology was used to study the effect of aluminum stress on the absorption of 4 different ions in the roots of the Chinese fir clone FS01. The results are as follows: with increased aluminum concentration and longer periods of aluminum stress, the H+ ion flow gradually changed from influx into efflux; there was a large variation in the K+ efflux, which gradually decreased with increasing duration of aluminum stress; and 1 h of aluminum stress uniformly resulted in Ca2+ influx, but it changed from influx to efflux after a longer period of aluminum stress. Changes in the different concentrations of aluminum had the largest influence on Mg2+.
Highlights
Aluminum is the third most abundant element in the earth’s crust, representing approximately 8% of its mass
The effect of aluminum toxicity on root elongation of Chinese fir We used the seedlings germinated from seeds of the Chinese fir clone NO.40 to evaluate the effect of aluminum toxicity on the root elongation of Chinese fir
We found that aluminum stress at different concentrations and for different lengths of time had different effects on the absorption of H+, K+, Ca2+ and Mg2+ ion flow in the roots of a Chinese fir clone
Summary
Aluminum is the third most abundant element in the earth’s crust, representing approximately 8% of its mass. Ulrich noted that in acidic soils, aluminum toxicity may be one of the primary abiotic stress factors contributing to forest decline [1]. Many studies have demonstrated that toxic aluminum concentrations rapidly inhibit root elongation, with the root tip the major site of aluminum-induced injury, resulting in a poor uptake of water and nutrients [2]. Rengel has noted that the effects of aluminum toxicity on the shoots, such as growth inhibition, become evident only after root growth is inhibited by exposure to toxic aluminum levels in the rhizosphere, resulting in mineral nutrition deficiencies in the aboveground tissue [4]. Current knowledge suggests that the detrimental effect of aluminum on plants has several facets, including the competitive inhibition of Mg2+ and Ca2+ absorption sites on the cell
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