摘要
为研究干旱胁迫对嫁接烤烟生理特性的影响,以KRK26为接穗,KRK26、K326和Anyan 2为砧木,采取盆栽方式,分析了不同处理根系形态、植株形态、抗性生理指标。结果表明,在前期干旱条件下,烟株的叶绿素相对含量(SPAD值)降低,脯氨酸含量、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性以及过氧化物酶(POD)活性升高。随着干旱胁迫的加剧,嫁接烟株的根系长度、表面积、株高、茎围、节距、LAI等呈降低趋势,Pro含量持续升高;随着生长发育,SPAD值、SOD活性、CAT活性、POD活性则呈现下降趋势,但降幅不同,异根嫁接苗降幅较低。KRK26/Anyan 2受到干旱胁迫的影响小于KRK26/K326、KRK26/KRK26,其中KRK26/KRK26受损最重。通过相关分析,嫁接烤烟形态指标与抗性指标间存在正相关关系。不同嫁接烟株的生长特性对干旱的响应存在明显差异,综合看来,嫁接烟株抗旱能力强弱依次为KRK26/Anyan 2、KRK26/K326、KRK26/KRK26。
In order to study the effect of drought stress on physiological characteristics of grafting flue-cured tobacco,using KRK26 as scion,KRK26,K326 and Anyan 2 as rootstock,analysing and discussing root morphology,plant morphology and physiological indexes of resistance in pot culture under different treatment.The results indicated that under drought stress conditions at early period,the relative content of chlorophyll（SPAD readings） decreased,while the content of proline,superoxide dismutase（SOD） activities,catalase（CAT） activities and peroxidase（POD） activities in flue-cured tobacco demonstrated an increasing trend.The root length,surface area,plant height,stem girth,node spacing and LAI of the grafted tobacco plants showed a decreasing trend,the content of proline continued to increase in both grafted seedlings and non-grafted seedlings with the aggravation of drought stress when tobacco leaves were turning to mature,whereas,the SPAD readings,SOD activities,CAT activities and POD activities all demonstrated a decreasing trend.The speed of decreasing in different root grafted was slower than that in own root grafted.Compared with KRK26/K326 and KRK26/KRK26,KRK26/Anyan 2 had greater parameters under drought stress,but the SPAD readings did not have significant difference.All the results showed that less damage was made to KRK26/Anyan 2 than KRK26/K326 and KRK26/KRK26 under drought stress,and KRK26/KRK26 suffered the most serious damage.According to correlation analysis,there was a certain correlation between morphological indexes and resistance indexes of grafting flue-cured tobacco.In conclusion,there were ob-vious differences among grafted tobacco in physiological characteristics,and there response to soil drought.The order of drought resistance was KRK26/Anyan 2,KRK26/K326 and KRK26/KRK26 in turn from strong to weak,based on the main root morphology,plant morphology,physiological characteristics under drought stress.
出处
《华北农学报》
CSCD
北大核心
2017年第6期161-169,共9页
Acta Agriculturae Boreali-Sinica
基金
四川省烟草专卖局(公司)项目(川烟科[2014]6号)
关键词
嫁接
干旱胁迫
酶活性
烤烟
抗旱性
Grafting
Drought stress
Enzyme activity
Flue-cured tobacco
Drought resistance
