Plant Growth Regulation

, Volume 76, Issue 3, pp 281–288 | Cite as

N–P–K ratio affects exudation of germination stimulants and resistance of tobacco seedlings to broomrapes

  • Meng Zhang
  • Yongqing Ma
  • Wenjin Zhong
  • Xueting Jia
  • Danrui Wu
  • Rui Yu
  • Xiaoxin Ye
Original Paper
First Online:
Received:
Accepted:

Abstract

Nutrient deficiency is known to aggravate the infestation of broomrape in a number of plant species. This effect is hypothesised to result from the promotion of the release of germination stimulants from the roots of the host plant. In the present study, three experiments (hydroponic culture, Petri dish culture and soil culture) were conducted to investigate the effects of macro-nutrient ratios on the production and release of germination stimulants and the resistance of host tobacco cultivars to broomrapes. The hydroponic culture study showed that nitrogen/phosphate deficiency and potassium excess increased the germination-inducing activity of root exudates on Phelipanche aegyptiaca and Orobanche cumana seeds, with two tobacco cultivars showing different responses to nutrient ratios. The production of germination stimulants was significantly increased under nitrogen- and phosphate-deficient soil conditions. In the Petri dish study, increased vulnerability to P. aegyptiaca infection was observed in RG tobacco seedlings under nitrogen- and potassium-deficient conditions and in WF tobacco seedlings under nitrogen- and phosphate-deficient conditions. The results showed that macro-nutrient ratios can affect both the exudation of germination stimulants and the resistance of tobacco seedlings. Finally, we suggest that the classification of the resistance or tolerance of host species should fully consider the nutritional conditions of cultivation and the strategy of fertilisation in terms of the potential control of parasitic weeds prior to the identification of the key mechanism of parasite resistance.

Keywords

Germination stimulants Macro-nutrition Orobanche Resistance Weed control 
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Notes

Acknowledgments

This study was funded by the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau (10502-Z7-3) and the National Science and Technology Support Program (2011BAD31B05). The authors also thank the anonymous reviewers of this paper for their useful suggestions.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Meng Zhang
    • 1
  • Yongqing Ma
    • 1
    • 2
  • Wenjin Zhong
    • 3
  • Xueting Jia
    • 3
  • Danrui Wu
    • 3
  • Rui Yu
    • 2
  • Xiaoxin Ye
    • 2
  1. 1.The State Key Laboratory of Soil Erosion and Dryland Farming of the Loess Plateau, Institute of Soil and Water ConservationChinese Academy of SciencesYanglingChina
  2. 2.College of ForestryNorthwest A&F UniversityYanglingChina
  3. 3.College of Resources and EnvironmentNorthwest A&F UniversityYanglingChina

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