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Root tip structure and volatile organic compound responses to drought stress in Masson pine (Pinus massoniana Lamb.)

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Abstract

The Masson pine (Pinus massoniana Lamb.) has a relatively strong tolerance to stressors such as acid rain, drought, and phosphorus deficiency. Previous studies have mainly focused on morphological, physiological, and metabolic responses in the needles of the Masson pine. However, there has been little study of the effects of drought stress on root tip structure or the composition of volatile organic compounds (VOCs) in the root tip. Therefore, this work aimed to evaluate the VOCs and anatomical growth responses of Masson pine root tips to drought stress. The results showed that (1) drought stress inhibited increases in root biomass, root growth, and lateral root number, and damaged and significantly deformed the root apical structure; (2) the relative contents of monoterpenes decreased with the intensity of drought stress, but the relative content of sesquiterpenes increased. (3) The ratio of sesquiterpenes to monoterpenes in the root tip was approximately 1:2 in the absence of stress, and became 3:1 under severe drought stress. The results indicate changes of secondary metabolism in the root tip of the Masson pine in response to drought stress.

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Acknowledgements

The authors thank Prof. Z.N. Yang (Guizhou Normal University, Guiyang, P. R. China), for the critical reading of the manuscript. This work was supported by the National Natural Science Foundation of China (NSFC, nos. 31260183, 31660200), National Science & Technology support Program during the 12th Five-Year Plan Period (no. 2015BAD09B01) and the National High-Tech R&D Program (863 Program) (no. 2011AA10020301).

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Correspondence to Guijie Ding.

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The authors declare no conflict of interest.

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Communicated by L. Bavaresco.

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Quan, W., Ding, G. Root tip structure and volatile organic compound responses to drought stress in Masson pine (Pinus massoniana Lamb.). Acta Physiol Plant 39, 258 (2017). https://doi.org/10.1007/s11738-017-2558-7

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  • DOI: https://doi.org/10.1007/s11738-017-2558-7

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