Abstract
For studying the physiological response of two different Dianthus caryophyllus cultivars on Cd stress, pot experiment was carried out to measure proline and glutathione in leaves, five types of organic acids in root exudates (oxalic acid, malic acid, acetic acid, tartaric acid, citric acid), soluble sugars and free amino acids, root length, root surface area, root volume, root projected area and Cadmium content in soil, plant roots and aboveground. According to the effects of cadmium stress on the physiological and biochemical characteristics of two Dianthus caryophyllus, the results showed that: the growth of two cultivars are affected, “Master” and “Xiao Yan” are manifested as plant height, leaf, flower buds and biomass decreased, but the “Master” by the stronger inhibitory effect. The root length, total root surface area, total root projected area, and average root diameter of the “Master” increased under cadmium stress, but the root volume decreased. However, the root length, total root surface area, root volume, and root projected area of the “Xiao Yan” under cadmium stress decreased, while the average root diameter increased. The glutathione in the leaves of the two cultivars decreased, the proline content of the leaves of the “Xiao Yan” increased, while that of the “Master” decreased. In the root exudates, the free amino acid content of the two cultivars are reduced, and the secretion of organic acids is also inhibited (except for the citric acid secreted in the “Master”), while the soluble sugar content in the root exudates is expressed as “Xiao Yan” increased, and the “Master” decreased. According to the physiological response to the two cultivars under cadmium stress, the “Xiao Yan” is more suitable for soil restoration in the mining area of Lanping area.
Highlights
Introduction industrial lands and1041 agricultural lands in my country, and based on the evaluation results, determined that Cd, The situation of soil Cd pollution is severe in China
2.3 Method Dianthus caryophyllus planted in soil with cadmium stress was the treatment group, and Dianthus caryophyllus planted in clean soil from Yunnan Agricultural University was the control group
3.1 Morphological indicators and biomass of two Dianthus caryllus cultivars under cadmium stress Plant height, leaves, flower buds and biomass of the two plants were showed in Table 1 which were inhibited under cadmium stress, but the inhibition effect of “Master” is stronger
Summary
1041 agricultural lands in my country, and based on the evaluation results, determined that Cd, The situation of soil Cd pollution is severe in China. In 2014, the “National Survey Bulletin of Soil Pollution Status” published by China showed that the total over-standard rate was 16.1%. Huang et al compared 336 articles published in my country from 2005 to 2017. It was found that 8 kinds of heavy metals (Cd, Cr, Hg, Pb, As, Cu, Zn, Ni) compared with the background value, the content of Cd and Hg increased, the content of the other 6 elements did not accumulate significantly [3]. Yang et al analyzed the content of heavy metals in soil of 402
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