Effects of Low Phosphorus on Growth,Phosphorus Accumulation and Rhizosphere Microorganisms of Different Genotypes of Millet
In order to explore the ability of different genotypes of millet to adapt to low phosphorus(P)condition,six millet varieties including Changnong 35,Jigu 13,Jigu 11,Jingu 21,Yugu 18 and Yugu 35 were selected as the research materials to determine biomass,P accumulation,P transport,root morphology and rhizosphere microorganisms under normal P application(P N,100 mg/kg P2 O5)and no P(P0)treatment.The results showed that under P0 treatment,the whole plant fresh weight and aboveground part dry weight of Jigu 11 were significantly higher than those of the other varieties and those under PN treatment;its total root length,total root surface area and total root volume were higher compared with PN treatment,and the former two reached significant level.The biomass and root morphological characters of Changnong 35,Jigu 13,Jingu 21,Yugu 18 and Yugu 35 were basically lower under P0 treatment compared with PN treatment.The plant P accumulation amount of Changnong 35,Jingu21 and Yugu 18 under P0 treatment significantly decreased by 12.99% ,28.13% and 50.27% compared with PN treatment,while that of Jigu 13,Jigu 11 and Yugu 35 was not significantly different between the two P treatments.The P allocation proportion in aboveground part of Jigu 13 significantly decreased by 4.04% under P0 treatment compared with PN treatment,while that in roots signif-icantly increased by 18.97% ;the P allocation proportion in aboveground part and roots of the other varieties had no significant difference between the two P treatments;Jigu 11 and Yugu 35 significantly increased the P allocation proportion in leaves under P0 treatment,but significantly decreased in stem.There were larger differ-ences in the number of culturable rhizosphere microorganisms among different millet varieties under the two P treatments.The bacteria and fungi quantity in rhizosphere soil of Changnong 35 and Jingu 21 were significantly larger under P0 treatment than those under PN treatment,and the bacteria and actinomycetes quantity of Jigu 11 were lower.In a word,Jigu 11 and Jigu 13 had better adaptability to low P environment.
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