Differences Of Phytotoxicity, Tolerance, Absorption And Transport Among Several Varieties Of Wheat When Amended Selenate And Selenite

Selenium is one of the trace element for humen. It has both nutritional and toxiceffects, and with a very small concentration between them. In this context, we both need to bereasonably Se by plants, but also need to be considered for the process of selenium. In thispaper, We study with wheat as the basic object, to study different valences, exogenousselenium effect on wheat growth and discuss and the migration in wheat, In the same time,considering the different varieties of wheat to different valence exogenous selenium tolerance,enriched wheat varieties for the screening and promotion, providing theoretical basis. Basedon the experimental background and purpose, this paper designs germination tests and potexperiments carried out to achieve. On wheat growth index, physiological indicators, soil andwheat selenium content in different parts of measurement and analysis, to draw conclusions asfollows:(1) The result showed that low concentration of Se (selenate<8mg/L, selenite<20mg/L)could promote the growth of wheat; and while higher concentration could inhibit the growth.The toxic effects of selenate were significantly higher than selenite on wheat at the sameconcentration(10mg/L).The statistic analysis showed that the inhibition of shoot height androot length could be regarded as the sensitive indicators of selenite and selenite, respectively.Different wheat genotypes varieties had different tolerance: Xinong979, Xiaoyan22, andLumai23had high tolerations and could be extended as Se-rich wheat; Shamai159,Shongyou2018have low tolerance and could be used as the sensitive species of Se pollutionin soil.(2) Addition the appropriate selenium (Se (IV)1-10mg/L; Se(VI)0-1mg/L) canpromote the growth of wheat in jointing; while high concentrations of selenium (10mg/L)can inhibitory effect the grow of wheat. in which the most significant inhibition abov eground(inhibition rate66.02%). The addition of selenium on wheat jointing has certain physiologicaleffects. The chlorophyll, photosynthesis rate,transpiration rate are inhibition by seleniumaddition. And the Ci is advance by selenium addition. However, no significant differencebetween levels.(3) In filling stage, exogenous effects of selenium on the different pairt of wheat,it show us:leaf> stem> root> Spike; Impact from the difference between the different levels ofperspective, high concentrations of selenium could significantly inhibit the growth of variousparts. In the mature part of the exogenous effects of selenium on the growth indicators werenot significant. Judging from the trend, Effect sizes were on different parts of the wheat: stem(68.88%)> leaf (24.61%)> root (23.28%)> seed (no inhibition). It show us that the stem is themost sensitive for selenium,It can be one of the Sensitive indicator for Selenium tolerance(4) In maturity, Se(IV) is mainly in wheat roots and grain inside; Se(VI) is mainlydistributed in wheat leaves and stems. From the perspective of transport we can find, wheatripening process (from filling stage to maturity) tetravalent selenium conditions in roots,stems, leaves with selenium content of mature wheat downward trend. The trend of Seconcentration in grain is increased significantly. In the Se(VI) addition, the concentration ofSe in the root,stem and leaf are elevated. Then the content of Se in grain is not significant.