Analysis of Phosphorus Utilization Efficiency in Natural Population of Tomato and Screening of Low Phosphorus Tolerant Germplasm
A natural population of tomato containing 196 accessions was treated with three levels of phosphorus including full nutrition(P,830 μmol·L-1 HPO42-),1％P(8.3 μmol·L-1 HPO42-)and 10％P(83 μmol·L-1 HPO42-)by nutrient solution at seedling stage using vermiculite as substrate.This natural population was evaluated for phosphorus efficiency and screened for low phosphorus tolerant accessions based on shoot dry weight,shoot fresh weight,plant height and chlorophyll content of seedlings.The results showed that both fresh and dry weights of the shoots exhibited a vast variation among the investigated indexes,indicating abundant genetic variation among these accessions.Using fresh weight ratio and dry weight ratio of shoot as evaluation indexes for low phosphorus tolerance,three accessions with low phosphorus tolerance at 1％P(TS-653,yf4andpl1)and 10％P(TS-26,TS-643 and TS-653)were screened out,respectively,by cluster analysis,and the relative phosphorus contents as well as the ratios of shoot phosphorus contents to root phosphorus contents of these accessions were also analyzed.Phosphorus efficiency comprehensive value of all the accessions was calculated using the fuzzy membership function method.Based on scatter plots,the accession TS-614 was selected,which showed high efficiency under three phosphorus levels.
tomatogermplasmlow phosphorus tolerancehigh phosphorus efficiencyphosphorus efficiency comprehensive value
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NSTL
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