Comprehensive Evaluation of Cadmium Tolerance of Tartary Buckwheat at Seedling Stage
Cadmium(Cd),a toxic heavy metal occurring in the environment naturally and an unessential trace element in plants,may cause a disturbance in the uptake and translocation of nutrients,inhibiting plant growth and development.To elucidate the effect of Cd stress on the growth of Tartary buckwheat seedlings and investigate the resistance to Cd toxicity at the seedling stage,147 germplasms were planted in 1/2 Hoagland nutrient solution(pH 5.8)with or without 30 μmol/L Cd2+ for 10 d in the phytotron.After treatment,the root length,root dry weight and shoot dry weight were measured,and the root morphological indexes of several materials were also analyzed.These measured datas were evaluated and classified by Linear Regression,Subordinate Function Method and the standard deviation coefficient method.The results indicated that Cd stress affected the root growth and biomass of Tartary buckwheat,which was mainly reflected in the inhibition of main root length,total root length,root volume and root surface area.Furthermore,the various germplasms affected how the materials responded to the toxicity of Cd.Ultimately,a total of 31 cadmium-tolerant and 72 cadmium-sensitive Tartary buckwheat germplasms were screened out.
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