摘要
以甜玉米(Zea mays L.var.rugosa Bonaf.)为材料,研究其对低pH与酸铝在不同处理条件下的响应,设置了6种处理方式:酸(S),营(Y),纯水(SH),酸铝营(SLY),酸铝(SL),酸营(SY),培养20d后测根系长度、表面积、体积、根尖数、干质量、光合色素、脯氨酸、丙二醛的变化.结果表明:低pH条件下对未施加营养液的甜玉米根的生长有抑制作用,而在施加营养液的处理中却有明显促进根生长的作用,游离脯氨酸在施加营养与未施加营养的条件下酸处理均大于对照,丙二醛(MDA)含量又均低于对照,叶绿素含量为酸大于水,营大于酸营.酸铝处理下各个指标关系,根长与根冠数上:酸铝大于纯水,酸铝营大于营;根体积与根干物质量:水大于酸铝,营大于酸铝营;根系总表面积:酸铝大于水,营大于酸铝营;游离脯氨酸含量:酸铝大于水,酸铝营大于营;叶绿素含量:水大于酸铝,营大于酸铝营;MDA含量:水大于酸铝,酸铝营大于营.低pH与酸铝对甜玉米的生长都有一定的影响作用,而甜玉米对这2种胁迫的耐性存在差异.在未施加营养的处理下酸严重抑制了甜玉米幼苗的生长,而在营养充足的情况下却又促进了甜玉米根的生长,但却对生理指标造成负影响,说明甜玉米有极强的耐酸性.由此可以看出低pH与酸铝可能存在不同胁迫机制.
The response of Sweet corn （Zea mays L. var. rugosa Bonaf. ） was studied as researched materials at different treatments that include acid （S）, nutrient （Y）,pure water （SH）,acid-aluminum-nutrient （SLY）, acid-aluminum （SL） and acid-nutrient （SY）. The authors will discuss the differences between these stresses from the sweet corn tolerance. Sweet corn were cultured 20 days, then measured the root total length, root total surf-area, root tips,root volume,root dry weight, chlorophyll, free proline and MDA. The re- sults confirmed that the sweet corn roots were inhibited by low-pH without nutrient, but contrary in nutri- ent. The content of free proline is more than CK at the low-pH treatment, no matter into or without nutrient. The content of MDA was all lower than CK at the low-pH treatment. And the content of chlorophyll S〉SH, Y〉SLY. The index relationship on acid-aluminum treatment is that SL〉SH, Y〉SLY at the root total length and tips. SH〉SL, SLYLY at the root volume and dry weight. SL〉SH,Y〉LY at the root total surf area. SL〉SH, SLYLY at the content of free proline. SH〉SL,Y〉SLY at the content of chlorophyll. SH〉SL, SLYLY at the content of MDA. The low-pH and acid-aluminum had effected on the growth of the sweet corn, and at the same time the sweet corn had different tolerance mechanism on these two stresses. The sweet corn roots were inhibited by low-pH without nutrient, but contrary in nutrient, and the physiological indexes of sweet corn in nutrient confirmed that the low-pH had inhabited the growth of sweet corn, so the authors can reach a conclusion that the sweet corn have a strong tolerance on low-pH stress. There may be the different stress mechanism between low-pH and acid-aluminum.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第3期146-150,共5页
Journal of Southwest China Normal University(Natural Science Edition)
关键词
低PH
酸铝
甜玉米
low-pH
acid-aluminum
sweet corn
