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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (3): 535-540.doi: 10.3724/SP.J.1006.2009.00535

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Potassium Accumulation and Root Physiological Characteristics of Potassium-Enriched Flue-Cured Tobacco Genotvpes

YANG Tie-Zhao1;YANG Zhi-Xiao1**;NIE Hong-Zi1;ZHANG Xiao-Quan1;LIU You-Jie1;SHANG Xiao-Ying1;REN Zhou-Ying2;FAN Jin-Hua3   

  1. 1Collage of Agronomy, Henan Agricultural University, Zhengzhou 450002,Henan;2China Tobacco Jiangxi Provincial Industrial Company, Nanchang 330096 Jiangxi;3 Hena Luohe County tobacco Company, Luohe 462000,China
  • Received:2008-07-20 Revised:2008-12-02 Online:2009-03-12 Published:2009-01-16

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Abstract:

Highquality of flue-cured tobacco in production in China is currently limited by low potassium content in leaf. It is necessary to screen the potassium-enriched flue-cured tobacco genotypes for alleviating the shortage of available potassium in soil. However, there is no standard procedure for such screening. Three different genotypes of flue-cured tobacco including one potassium-enriched cultivar Nongda 202 and two common cultivars of Jingyehuang and NC89 were surveyed in potassium accumulation and root physiology with a hydroponic culture at normal K level (3 mmol L-1). The results showed that the potassium accumulation of root and stalk among three cultivars were not significantly different, whereas, the leaf potassium concentration of Nongda 202 was significantly higher than that of Jingyehuang and NC89. The indices of root physiology consisting of root vigor and total root vigor,excreted H+, CEC, soluable protein content, ATPase activity in Nongda 202 were significantly higher than those in Jingyehuang and NC89, but there were no significant differences in those except root vigor and H+ excretion between Jingyehuang and NC89. Compared with Jingyehuang and NC89 in the K+ dynamic uptake parameters of root, Nongda 202 had higher Vmax and lower Km, Cmin at seeding stage, but higher Vmax, Km and Cmin at vigorous growing stage, indicating that the potassium absorption velocity of Nongda 202 was higher, but its tolerance to low potassium was weaker at vigorous growing stage. In conclusion, the potassium accumulation capability of leaves is strong, the physiological activity is vigorous and the potassium absorption rate of roots are high in potassium-enriched flue-cured tobacco genotype.

Key words: Flue-cured tobacco, Potassium-enriched genotype, Potassium accumulation, Root physiology, Uptake kinetics

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