苋菜对钾素吸收和利用上的基因型差异

The kinetics of K^ absorption and the utilization of both applied K and K in a calcareous alluvisol with low available K by different genotypes of grain amaranth(Amaranthus spp.),an ancient pseudo-cereal that produces a large biomass and a rich source of health nutrients and mineral elements,were studied by means of ion depletion technique and pot experiments.Grain amaranth had a high affinity for K^ absorption comparison with corn and cotton.However,there were differences among Amaranthus spp.in Kabsorption and utilization.Some cultivars such as R104,CX-4,Du001,Hy015 and Hr029 which had a higher rate of K absorption and stronger affinity for K^ were typical varieties with high K-use efficiency(KUE).The results showed that high KUE cultivars grew quickly,possessed stronger ability to take up soil slowly available K and Mineral K,and did not respond to K fertilization in the soil with low available K.Correspondingly,grain amaranth cultivars CX-77,Cr024,Vd001,Re003 and Sn003 were relatively low in KUE,Compared with high KUE cultivars,they took up more soil available K and both of their dry matter accumulation and K uptake responded to K applied significalty.

Genotypic variations in potassium absorption and utilization by Amaranthus spp.

The kinetics of K+ absorption and the utilization of both applied K and K in a calcareous alluvisol with low available K by different genotypes of grain amaranth (Amaranthus spp.), an ancient pseudo-cereal that produces a large biomass and a rich source of healthy nutrients and mineral elements, were studied by means of ion depletion technique and pot experiments. Grain amaranth had a high affinity for K+ uptake in comparison with corn and cotton. However, there were differences among Amaranthus spp. in K absorption and utilization. Some cultivars such as R104, CX-4, Du001, Hy015 and Hr029 which had a higher rate of K absorption and stronger affinity for K+ were typical varieties with high K-use efficiency (KUE). The results showed that high KUE cultivars grew quickly, possessed stronger ability to take up soil slowly available K and mineral K, and did not respond to K fertilization in the soil with low available K. Correspondingly, grain amaranth cultivars CX-77, Cr024, Vd001, Re003 and Sn003 were relatively low in KUE. Compared with high KUE cultivars, they took up more soil available K and both of their dry matter accumulation and K uptake responded to K applied significantly.