Influence of Drought Stress on the Growth and Physiological Characteristics of the Grafting Flue-cured Tobacco

doi:10.7668/hbnxb.2017.06.024

Abstract

Abstract: 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 obvious 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.

Key words: Grafting, Drought stress, Enzyme activity, Flue-cured tobacco, Drought resistance

CLC Number:

S572.01

XIE Bing, XIANG Jinyou, RAO Zaisheng, CAO Yueqiang, TANG Ming, YUAN Jichao, YI Man. Influence of Drought Stress on the Growth and Physiological Characteristics of the Grafting Flue-cured Tobacco[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2017, 32(6): 161-169. doi: 10.7668/hbnxb.2017.06.024.

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