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A novel Brassica–rhizotron system to unravel the dynamic changes in root system architecture of oilseed rape under phosphorus deficiency

Yuan, Pan; Ding, Guangda; Cai, Hongmei; Jin, Ke-Mo; Broadley, Martin R.; Xu, Fangsen; Shi, Lei

Authors

Pan Yuan

Guangda Ding

Hongmei Cai

Ke-Mo Jin

Martin R. Broadley

Fangsen Xu

Lei Shi



Abstract

Background and Aims: An important adaptation of plants to phosphorus (P) deficiency is to alter root system architecture (RSA) to increase P acquisition from the soil, but soil-based observations of RSA are technically challenging, especially in mature plants. The aim of this study was to investigate the root development and RSA of oilseed rape (Brassica napus L.) under low and high soil P conditions during an entire growth cycle.

Methods: A new large Brassica–rhizotron system (approx. 118-litre volume) was developed to study the RSA dynamics of B. napus ‘Zhongshuang11’ in soils, using top-soils supplemented with low P (LP) or high P (HP) for a full plant growth period. Total root length (TRL), root tip number (RTN), root length density (RLD), biomass and seed yield traits were measured.

Key Results: TRL and RTN increased more rapidly in HP than LP plants from seedling to flowering stages. Both traits declined from flowering to silique stages, and then increased slightly in HP plants; in contrast, root senescence was observed in LP plants. RSA parameters measured from the polycarbonate plates were empirically consistent with analyses of excavated roots. Seed yield and shoot dry weights were closely associated positively with root dry weights, TRL, RLD and RTN at both HP and LP.

Conclusions: The Brassica–rhizotron system is an effective method for soil-based root phenotyping across an entire growth cycle. Given that root senescence is likely to occur earlier under low P conditions, crop P deficiency is likely to affect late water and nitrogen uptake, which is critical for efficient resource use and optimal crop yields.

Journal Article Type Article
Journal Annals of Botany
Print ISSN 0305-7364
Electronic ISSN 1095-8290
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 118
Issue 2
APA6 Citation Yuan, P., Ding, G., Cai, H., Jin, K., Broadley, M. R., Xu, F., & Shi, L. (in press). A novel Brassica–rhizotron system to unravel the dynamic changes in root system architecture of oilseed rape under phosphorus deficiency. Annals of Botany, 118(2), https://doi.org/10.1093/aob/mcw083
DOI https://doi.org/10.1093/aob/mcw083
Keywords oilseed rape (Brassica napus L.), phosphorus deficiency, root system architecture, dynamic changes, Brassica-rhizotron
Publisher URL http://aob.oxfordjournals.org/content/118/2/173
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is a pre-copyedited, author-produced version of an article accepted for publication in Annals of Botany following peer review. The version of record A novel Brassica–rhizotron system to unravel the dynamic changes in root system architecture of oilseed rape under phosphorus deficiency /
Pan Yuan, Guang-Da Ding, Hong-Mei Cai, Ke-Mo Jin, Martin Roger Broadley, Fang-Sen Xu, and Lei Shi, volume 118, issue 2, pp. 173-184 is available online at: http://aob.oxfordjourna...ent/118/2/173.abstract. doi: 10.1093/aob/mcw083

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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