- 著者
- Michael O. Adu David O. Yawson Malcolm J. Bennett Martin R. Broadley Lionel X. Dupuy Philip J. White
- 出版者
- Plant Root 編集委員会
- 雑誌
- Plant Root (ISSN:18816754)
- 巻号頁・発行日
- vol.11, pp.16-32, 2017 (Released:2017-05-16)
- 参考文献数
- 67
- 被引用文献数
- 7
Rhizoboxes are soil-root compartments that may well provide the closest naturalistic conditions for studying root systems architectures (RSAs) in controlled environments. Rhizobox-based studies can however lead to mis-estimation of root traits due to poor recovery of roots and loss of fine root features during washing of roots. We used a novel scanner-based rhizobox system to evaluate: (i) RSA traits of Brassica rapa genotypes; (ii) the relationship between root traits recorded from rhizoboxes and those of harvested roots and (iii) genotypic variation of seedlings in response to external P ([P]ext) availability. Brassica rapa genotypes were grown in soil-filled rhizoboxes abutting flatbed scanners and were watered once with either deionised water or a solution of 600 ΜM KH2PO4 to approximately 80% field capacity on a weight basis. Shoot and root P concentrations ([P]shoot and [P]root) of the B. rapa lines grown on different [P]ext were quantified. Visible root length at the surface of rhizoboxes constituted 85% of the total root length recovered from harvested root samples. High P supply induced a strong increase in [P]shoot in all genotypes (P < 0.001) whereas low P supply generally led to greater partitioning to roots. Seed P concentration and tissue P concentration were correlated only at low [P]ext. Total root length was strongly correlated with tissue P content under both low [P]ext (r = 0.81, P < 0.05) and high [P]ext (r = 0.82, P < 0.05) conditions. The novel scanner-based rhizobox system used addresses the substantial limitations associated with current use of rhizoboxes to study root growth dynamics.
- 著者
- Thomas Marler Cameron Musser
- 出版者
- Plant Root 編集委員会
- 雑誌
- Plant Root (ISSN:18816754)
- 巻号頁・発行日
- vol.10, pp.21-25, 2016 (Released:2016-05-10)
- 参考文献数
- 24
- 被引用文献数
- 10
Container production of Serianthes nelsonii Merr. plants for out-planting within the endemic range is a major component of the plan to recover the critically endangered tree species. We exploited the ability to prune roots with copper or with strategically placed air holes in container walls to determine if root quantity or quality would increase in comparison to traditional container design. Following 23 days of growth after transplanting, new root length and root dry weight did not differ among the container types. However, most roots from the control and copper-treated containers developed from the bottom of the root system, and direction of root growth was primarily geotropic. In contrast, the air-pruning containers produced plants with plagiotropic root growth near the soil surface. Root growth was positioned with 58% in the top two-thirds of a rhizotron window for the air-pruning, 29% for the copper-pruning, and 16% for the control containers. Our results indicate that direction but not length or dry weight of post-transplant root growth was changed by use of air-pruning containers. For a critically endangered tree like Serianthes nelsonii, the improved root morphology afforded by containers that use air-pruning of roots in the nursery may improve tree stability following transplanting.
- 著者
- Peter W. Barlow
- 出版者
- Plant Root 編集委員会
- 雑誌
- Plant Root (ISSN:18816754)
- 巻号頁・発行日
- vol.9, pp.43-55, 2015 (Released:2015-08-27)
- 参考文献数
- 87
- 被引用文献数
- 6
Within the tip of roots meristems of angiosperms and gymnosperms there is a small group of cells known as the quiescent centre (QC). The concept of the QC was developed 60 years ago by FAL Clowes, working in the Botany School, Oxford University, UK. To celebrate the Jubilee of the QC, a brief outline of the work that led to its demonstration by autoradiography was presented by Dubrovsky and Barlow (2015). The present article traces Clowes’s subsequent experimental studies of the QC, especially with regard to how X-irradiation became an important tool for elucidating the properties and significance of the QC for root development. Also reviewed are some of the consequences that subsequently arose from this work with radiation, in particular the concerns over the use of radioisotopes in attempts to describe the kinetics of cell proliferation in the root meristem.
- 著者
- Ichirou Karahara
- 出版者
- Plant Root 編集委員会
- 雑誌
- Plant Root (ISSN:18816754)
- 巻号頁・発行日
- vol.9, pp.1-5, 2015-03-13 (Released:2015-03-24)
- 参考文献数
- 15