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The Research of Physiological Characteristic and Aluminum Absorption Characteristic about Iris Tectorum Maxim. and Iris Pseudacorus L. are under the Aluminum Stress

Author: ZhuCan
Tutor: PengJinZuo
School: Hunan Agricultural University
Course: Gardening
Keywords: Iris tectorum Maxim. Iris pseudacorus L. Al3+ intimidation physiological characteristics, absorption characteristics
CLC: S682.19
Type: Master's thesis
Year: 2009
Downloads: 20
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Abstract


This test uses water culture method to study the different concentrations of Al3+’s influence on the physiological characteristics of Iris tectorum Maxim.and Iris pseudacorus L.,as well as aluminum absorption properties of two plants.The results showed that:（1） Iris tectorum Maxim.and Iris pseudacorus L.are both display certain adaptiveness to the aluminum coercion;（2） The duralumin ability of Iris tectorum Maxim.is higher than Iris pseudacorus L.’s（3）Two kind of plants to the Al3+ absorption are the passive diffusions,and Low aluminum processing can promote its growth,higher aluminum processing can hinder its growth;（4） Iris tectorum Maxim and Iris pseudacorus L.’s aluminum poisons the marginal value to be in 0.04～0.06mmol.L-1,Is higher than this density,the adult plant grows is affected,And the degree of Iris.pseudacorus L.forced is to be high.The research is divided two part of:1 The aluminum coercion is plant,physiology characteristic to two kinds of Iris.①0～0.04mmol.L-1 Al3+ processing,Iris teetorum Maxim.and Iris pseudacorus L.’s chlorophyll a,chlorophyll b,total chlorophyll,carotenoid content and root activity reached the highest level,with the Al3+ concentration continuing to rise,the levels were gradually decreased,the difference was significant.②0.02mmol.L-1Al3+ processing,soluble sugar content in leaves of Iris tectorum Maxim.and Iris pseudacorus L.reached their lowest level,as the Al3+ concentration continues to rise,soluble sugar content increased significantly.③0～0.1mmol.L-1Al3+ processing,MDA and free proline content in leaves of Iris tectorum Maxim.and Iris pseudacorus L.were gradually increased.0.1mmol.L-1 Al3+ processing,content were highest,and differences reached significant level.2 Two kinds of Iris spp.are the plant aluminum absorption characteristics ①0.02～0.1mmol.L-1Al3+ processing,there was a linear correlation between the aluminum absorption rate and Al concentration of the two kinds of plants,Iris tectorum Maxim.satisfied the linear equation: y（absorption rate）=0.0041x(Al3+concentration)-0.0062,（R2=0.987）,Iris pseudacorus L.satisfied the linear equation:y（absorption rate）=0.0046x(Al3+concentration)+0.0007, （R2=0.9888）.Two pairs of Al3+ uptake were passive diffusion.②In continuous culture of 0.04mmol.L-1Al3+,aluminum absorption volume of Iris tectorum Maxim.and Iris pseudacorus L.increased gradually over time,and in each while,Iris pseudacorus L.’s aluminum absorption volume is greater than Iris tectorum Maxim’s.③In continuous culture of 0.04mmol.L-1Al3+,aluminum absorption rate of Iris tectorum Maxim and Iris pseudacorus L.declined over time.In the four-hour period 10:00-13:00,it was down by a big margin and slowing after 13 O’clock.④Metabolic inhibitor 2,4-DNP restrained the Al3+ absorption of Iris tectorum Maxim.and Iris pseudacorus L..Inhibition rate has significant negative correlation with the concentration of Al3+ in solution,in which Iris tectorum Maxim.satisfied the linear equation:y（inhibition rate）=-0.0301x（Al concentration）+0.7469,（R2=0.8592）; Iris.pseudacorus L.satisfied the linear equation:y（inhibition rate）=-0.0241x（Al concentration）+0.6057,（R2=0.853）.⑤Under the conditions of 0～0.04mmol.L-1Al3+,aluminum content in the roots of Iris tectorum Maxim.and Iris pseudacorus L.was higher than that in leaves,and it was in linear correlation between the Al content and the concentration of Al treatment （x）of the two roots（yr）and leaves（yl）.Iris tectorum Maxim’s relationship formula: yr=0.0131x+0.0276（R2=0.9852）,y1=0.0059x+0.0166（R2=0.9843）;I.pseudacorus L.: yr=0.0133x+0.0372（R2=0.987）,y1=0.0062x+0.0243（R2=0.996）.⑥Aluminum toxicity mainly concentrated in the roots of two species.In all treatment conditions,the accumulation volume of the aluminum of the two kinds of plant’s roots and leaves increased as aluminum concentration’s increasing,and the percentage that aluminum accumulation in roots accounts for the total concentration in whole seedling rised with the increasing of Al concentration,while the leaves were the opposite.

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CLC: > Agricultural Sciences > Gardening > Ornamental Horticulture ( flowers and ornamental trees) > Perennial Flowers > Perennial Flowers Class > Other
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