Performance of Crambe Submitted to Aluminum Stress: An Important Oilseed Plant

Abstract

Crambe is a potential oilseed plant, which has been suggested for cultivation as a cover crop in the Brazilian Savanna where acidic soils predominate. Understanding of its performance in those conditions is essential. Thus, the objective of this study was to characterize the morphological and physiological changes in crambe plants when subjected to Al exposure at different dose levels. Plants were allocated to a nutrient solution with Al treatments at concentrations of 0.0, 0.1, 0.2, 0.3 and 0.4 mmol L-1. The following parameters were determined: length of root (LR) and shoot (LS), dry mass of roots (RDM) and shoots (SDM), Al uptake in plant tissues, leaf area (LA), absolute growth rate (AGR), grain yield (GY), net CO2 assimilation rate (A), stomatal conductance (gs), transpiration rate (E) and chlorophyll α fluorescence. The experimental design was completely randomized, consisting of five treatments with four replications. Regression analyses of growth parameters and mean comparative tests of physiological traits were performed. Roots concentrated approximately 40-fold more Al than shoots. There was a linear reduction in LS and LR with increasing doses of Al. For RDM, SDM, LA, AGR and GY, the reductions were similar and were better explained by quadratic models. Al damaged the photosynthetic apparatus of crambe plants, demonstrated by a significant reduction in the values of Fv/Fm (estimation of photosynthetic efficiency), A, gs and E, compared to the control. Al negatively affected growth parameters as well as the photosynthetic response of crambe plants, resulting in a substantial decrease in its grain yield.

Mitigating Effects of Beta-Carotene on Hydroponic Growth and Productivity of Amaranthus Hybridus L. under Aluminium Toxicity Induced Stress

“…Aluminium (Al) toxicity is an important growth-limiting factor for plants in acid soils below pH 5.0 and is responsible for shortages in food production (Blue and Dantzman, 1977 The general population is exposed to Al from its widespread use in water treatment, food additive, various Al-based pharmaceuticals, toothpaste, antiperspirants, pollutants from electrical power stations, industrial activities and automobile exhaust as well as from Al containers/packaging materials and cooking utensils (Harris et al 1996;Ma et al 2001;Pournourmohammadi et al 2008) Some of the most noticeable phytotoxic symptoms of Al toxicity include inhibition of root growth (Silva 2012; Kopittke et al 2015;Rosmaninho et al 2019), leaf-chlorosis, and stunted plant growth (Gupta et al 2013;Vasconcelos et al 2020). The roots exhibit greater signs of cellular damage than the other parts of the plant (Wagatsuma et al 1987; Rincón and Gonzales 1992; Udengwu and Egedigwe 2014; Kochian et al 2015).…”

Tolerance Test of Upland Rice Promising Lines to Alumunium Stress in Water Culture Media

“…[31] stated that the accumulation of Al at the root turned out to be high in non-adaptive varieties, this caused the growth of the roots of the variety to be inhibited. [32] stated that due to aluminum poisoning, the roots become shortened, thicker and brownish and the leaves become necrotic due to chlorosis. Inhibition of root and bud growth is the earliest al-induced morphological change [33].…”

Effects of Liming on the Growth and Nutritional Status of Crambe (Crambe abyssinica Hochst)

“…Nevertheless, the same authors pointed out the toxic effect of this element. On the other hand, Rosmaninho et al (2019) evaluated the tolerance of crambe to aluminum and observed a reduction in root growth, TDM and grain productivity. Colodetti et al (2015) observed a reduction in the hypocotyl and root length of crambe seedlings, compromising the initial growth of the plant.…”

“…Crambe cultivation can be compromised in the presence of aluminum Al 3+ (Bassegio et al, 2016;Rosmaninho et al, 2019) and low levels of calcium (Ca) and magnesium (Mg) in the soil. Successful crambe cultivation has been carried out at pH values higher than 5.8 in eutrophic soils (Pitol et al, 2010).…”