Abstract
AbstractThis study investigated the effect of cadmium (Cd) chloride on the uptake of N, P, and K and evaluate the effect of Cd-resistant bacterium “N3” on reducing the adverse effect of Cd in grafted and nongrafted plants. The shoot and total dry weights of the nongrafted muskmelon plants decreased under 50 and 100 µM Cd treatments. The scion and shoot dry weights of the grafted plants increased significantly, whereas their root dry weight increased by nearly onefold compared with those of the CK-grafted plants regardless of Cd concentration. The N, P, and K contents in the nongrafted plants decreased under Cd treatments but increased under 50 µM Cd treatment when inoculated with “N3”. The N, P, and K contents in the grafted plants were lower than those treated with only Cd. The grafted and nongrafted plants exhibited low Cd accumulation in the scion or shoot part compared with the root tissues. “N3” inoculation reduced the Cd concentration in all tissues of the grafted and nongrafted plants. Our results demonstrated great variation in Cd accumulation in the grafted and nongrafted muskmelon plants, thereby promoting food safety under Cd contamination conditions.
Highlights
Muskmelon is a warm season crop that is cultivated in arid and semi-arid regions of the world; it can be cultivated successfully in off-season [1]
We explored the effect of Cd and Cdresistant bacterium “N3” on N, P, and K uptake in grafted and nongrafted plants under the two concentrations of Cd
The shoot dry weight and total dry weights of the nongrafted muskmelon plants decreased under 50 and 100 μM Cd treatments (Figure 2a). This result suggested that Cd inhibited the shoot growth of nongrafted muskmelon plants
Summary
Muskmelon is a warm season crop that is cultivated in arid and semi-arid regions of the world; it can be cultivated successfully in off-season [1]. Grafting vegetable crops has become a well-developed and useful practice attributing to its horticultural advantages [6]. Grafted plants are essential to vegetable production and have become a significant requirement in vegetable intensive seedling production, e.g., tomato, watermelon, muskmelon, and cucumber [7,8,9]. Grafting is widely used because of its advantages of limiting the effects of soil-borne pathogens, enhancing tolerance to abiotic stresses, contributing to the efficiency of nutrient uptake, and improving the fruit yield [10,11]. Grafting is a normal way of increasing the nutrient uptake in various horticultural plants [13]. Grafted plants exhibit better nutrient uptake because of the strong ability of the rootstock’s roots to absorb nutrients from the soil. Regulating the assimilation of nutrients in the rootstock is vital for the grafted plant growth
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