Foliar application of two silica sols reduced cadmium accumulation in rice grains.
In the present study, pot experiments were conducted to investigate the effects of foliar application of two silica (Si) sols on the alleviation of cadmium (Cd) toxicity in contaminated soil to rice. Results showed that the foliar application of Si sols significantly increased the dry weight of grains (without husk) and shoots in rice grown in Cd contaminated soil, whereas the Cd concentration in the grains and shoots decreased obviously. The total accumulation of Cd in rice grains also decreased with the application of both of the Si sols, but no significant effect was found on the Cd accumulation in the shoots. For the optimal effect, Si-sol-B should be foliar applied at the tillering-stage during rice growth. The mechanism of Si foliar application to alleviate the toxicity and accumulation of Cd in grains of rice may be related to the probable Cd sequestration in the shoot cell walls.
Liu
Chuanping
C
Guangdong Public Lab of Environmental Science & Technology, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China.
Li
Fangbai
F
Luo
Chunling
C
Liu
Xinming
X
Wang
Shihua
S
Liu
Tongxu
T
Li
Xiangdong
X
D018533:Biomass; D002104:Cadmium / Q000032:analysis / Q000737:chemistry* / Q000633:toxicity*; D002473:Cell Wall; D002627:Chemistry, Physical / Q000379:methods; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination; D018527:Hydroponics; D012275:Oryza; D010316:Particle Size; D018521:Plant Physiological Phenomena; D012822:Silicon Dioxide / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013997:Time Factors
D012989:Soil Pollutants; D002104:Cadmium; D012822:Silicon Dioxide