admin管理员组

文章数量:1566998

2024年5月10日发(作者:)

摘要

本试验通过对三个品种向日葵进行三种浓度的中性盐胁迫处理,研究酸性磷酸

酯酶(APA)、过氧化物酶(POD)、超氧化物歧化酶(SOD)和过氧化氢酶(CAT)等同工

酶的活性变化以及向日葵的不同器官的解剖结构的变化。比较三个向日葵品种在不

同浓度盐胁迫下的生理生化差异,主要结果如下:

l、中性盐对康地5号向日葵伤害较轻,而对2603向日葵和KWS203向日葵伤

害比较严重,2603向日葵和KWS203向同葵伤害程度相差不大。就生物膜透性伤害

程度而言,康地5号向日葵明显低于2603向日葵和KWS203向日葵,其脯氨酸含量

显著高于2603向日葵和I(7『S203向R葵,丙二醛含量则明显低于2603向日葵和

KWS203向同葵。在抗氧化保护酶活性变化方面,康地5号向日葵POD、CAT活性变

化较2603向日葵和KWS203向日葵快,而SOD活性上升更明显。分析结果表明,三

个品种的向日葵耐盐性存在差异,康地5号向日葵的耐盐性比2603向同葵和I(1I『203

向日葵强。

2、从解剖结构上分析,它在老根中建立了一种屏障,即外皮层栓质化,栓质

化的主要成分是难溶于水的脂类物质,它透气透水性差,使溶解于土壤中的高浓度

盐分很难进入根中。根的外皮层细胞层数增多,又容纳了大量的盐分:植物的茎内

具有含晶细胞,盐类以晶体形式沉积,将植物体内多余盐分固定下来,从而抑制盐

分对细胞产生毒害作用:植物的叶片在盐胁迫下,气孔大部分关闭,数量明显减少,

存储下的水分能溶解多余的盐分。并且植物体内具有发达的通气组织,这与水生和

湿生植物的通气组织相似,以适应盐碱土地的缺氧环境。

关键词:向同葵;基因型:中性盐胁迫:酶活性;解剖结构

Study

on

mechanismanddifferenceof

salt—tolerant

ofvarietiesof

Sunflower

Abst

ract

Through

the

study

thatthree

variety

sunflowers

WaSstressed

by

three

concentrationofneutral

salt,The

isoenzymeactivity

such

as

acidic

phosphatase(APA)

isozyme,theperoxide

enzyme(POD)isozyme,the

hyperoxide

mutase(SOD)

isozyme

and

the

catalase(CAT)isozyme

was

tested,笛well勰the

changes

ofthe

anatomical

structure

ofthedifferent

organs

ofSunflowerWas

researched.We

compared

the

physiological

and

biochemicalindexes.inthedifferentsunflower

variety

underthedifferent

density

salt

stress,the

mainresults

ale

as

follows:

1.The

harm

to

Kang

5(Sunflower

variety)is

light,but

is

quite

serious

to

2603

(Sunflower

variety)and

the

KWS203(Sunflower

variety).The

harm

to

2603and

the

KWS203

is

similar.Regarding

theharm

tO

the

biomembrane

penetrability,Kang

are

obviously

lower

than

2603

andKWS203,its

content

of

proline

obviously

is

higher

than

2603

and

KWS203,the

content

of

malondialdehyde

obviously

islower

than

2603

and

KWS203.Regarding

the

enzyme

activity

in

theoxidation

resistance

protection.

The

POD,CAT

activeness

change

of

Kang

5iSmore

quick

than2603

and

KWS203,and

theSODactivenessriseismore

obvious.Analysis

of

variance

results

showedthat

thesalt

tolerance

ofthree

varietiesof

sunfloweriSremarkable.The

salt—tolerant

ofthedifferent

vafiety-s

sunfloweris

remarkable

difference,the

salt-tolerant

ofthe

Kang

5ismore

remarkable

than2603

andKW203.

2.Throug

the

structural

analysis

ofanatomical

structures,first

of

all,it

haS

established

one

kindofbarrierin

the

root,namely

theexodermis

suberization,the

mainconstituentofsuberizationis

lipid

materialthatis

difficult

to

dissolvein

water,it

is

air-tight

and

water·proof,it

is

very

difficult

that

the

high

concentration

of

salt

dissolved

inthesoil

enter

the

root.The

number

of

layers

ofthe

coaex

of

root

is

increaSedand

accommodate

large

numberof

salt;Second,it

haS

the

crystal

cellin

plants,the

salts

was

depositedby

the

crystal,the

unnecessary

salinity

WaS

fixed,thus

inhibiting

thetoxicactionofthe

salinity

to

the

cell.Additionally,plants

havethe

developed

aerenchyma,this

issimilarwiththe

aerenchyma

of

aquaticplant

and

hygrophyte,itadapts

to

circumstances

of

inadequateoxygen

on

saline

and

alkali

land.

本文标签: 向日葵植物差异胁迫品种