Study Of Lead, Cadmium And Tobacco Field Type Of Relationship Of Different Flue-cured Tobacco Varieties Accumulation

To investigate tobacco heavy metal iron absorption rate and development under heavy metal iron stress in two different agrotype. In this study, two Nicotiana tobacum species k326and HD (Honghua Dajingyuan) which both planted in upland soil and paddy soil had been sprayed different concentration Pb2+and Cd2+into leaf surface. The results showed that:1Agronomic trait of both two tobacco species were decreased when Pb2+and Cd2+concentration increase, confirmed heavy metal iron Pb2+and Cd2+have negative effects for tobacco development, furthermore, the effects may related to their concentration.2When under the heavy metal iron stress, heavy metal contents in all parts of two tobacco species were increased when sprayed concentration increase. It confirmed that the enrichment of heavy metal iron in tobacco positively correlated to sprayed concentration.3When under Pb2+and Cd2+stress, tobacco development showed difference in paddy soil and yellow soil. Both K326and HD grown in paddy soil showed better agronomic trait than grown in yellow soil. It suggested that tobacco should grow well in paddy soil than yellow soil when under the heavy metal iron stress.4When under Pb2+and Cd2+stress, heavy metal iron showed quite different distribution in tobacco leaf tissue between two different agrotype. In detail, tobacco grown in yellow soil showed more heavy metal iron distribution in bottom of leaf tissue. Some of other study confirmed when heavy metal iron transferred from soil to plants, the contents of them were decreased from bottom to top. It suggested yellow soil may easy for heavy metal iron enrichment.The results shows that the yellow soil may easy for heavy metal iron enrichment, and it should have negative effect for tobacco plant by block their development and increase heavy metal iron content.