Abstract: In order to explore the effects of aluminum(Al) stress on growth and nutrient absorption characteristics of different Al-tolerant rapeseed varieties, a hydroponically experiment with four concentrations and two stress time of Al treatment was carried out to measure root morphology(total root length, total root surface area, total root volume, total root tips), growth indicators(rootstock thickness, plant height, dry weight above ground, dry weight of root system) and nutrient elements(N, P, K, Ca, Mg, Fe, Al) content.The results showed that Al stress reduced total root length, total root surface area, total root volume, total root tips, rhizome thickness, plant height, root dry weight, and above-ground dry weight. With the increase of concentration and time of Al treatment, the decrease of root and growth indicators were further enhanced, and these decrease of Al-sensitive variety were more than that of Al-tolerant variety. Al stress promoted the absorption of Al in the shoots and roots of rapeseed, and the increase of Al content in roots were higher than that in the shoots; while it had a inhibition on the absorption of N, P, K, Ca, Mg, Fe and other elements. With the increase of concentration and time of Al treatment, these increase or decrease of nutrient elements content were further enhanced, and there were certain differences between genotypes, while these variation of Al-sensitive variety were more than that of Al-tolerant variety. Obviously, compared with Al-sensitive variety, the root morphology, aerial growth and nutrient absorption of Al-tolerant variety which had stronger adaptability to aluminum toxicity were less inhibited.The research results can provide a theoretical basis for the high-yield cultivation of rapeseed on acid soil.

Key words: Rapeseed, Aluminum stress, Morphological parameters, Nutrient absorption

CLC Number: 

• S634.01

• S143.7