Please be advised that the site will be down for maintenance on Sunday, September 1, 2024, from 08:00 to 18:00, and again on Monday, September 2, 2024, from 08:00 to 09:00. We apologize for any inconvenience this may cause.
dc.contributor.author | Mvondo-She, Mireille Asanzi![]() |
|
dc.contributor.author | Mashilo, Jacob![]() |
|
dc.contributor.author | Gatabazi, Auges![]() |
|
dc.contributor.author | Ndhlala, Ashwell Rungano![]() |
|
dc.contributor.author | Laing, Mark D.![]() |
|
dc.date.accessioned | 2024-08-01T09:15:44Z | |
dc.date.available | 2024-08-01T09:15:44Z | |
dc.date.issued | 2024-01 | |
dc.description | This paper is a part of the PhD Thesis "Studies of silicon fertilization in citrus to enhance chilling injury resistance" of Mireille Asanzi Mvondo-She, presented at the University of Pretoria, South Africa in 2020. (URI: http://hdl.handle.net/2263/75621) | en_US |
dc.description | DATA AVAILABILITY STATEMENT : Data supporting the findings of this study are available on request from the corresponding author. | en_US |
dc.description.abstract | Low-temperature stress is an important limiting factor affecting citrus growth and fruit yields. Therefore, increasing citrus cold stress tolerance may enhance the growth, yield, and quality of citrus production in marginal areas. The objective of this study was to determine the efficacy of silicon (Si) fertilizer application on cold-tolerance enhancement in citrus. Two citrus cultivars (Delta and Nules) were subjected to Si fertilization (control, 1000 mg L−1) and cold-stress temperature treatments (control and 0 ◦C for 72 h) using a 2 × 2 × 2 factorial treatment structure with six replications. Leaf gas exchange and chlorophyll fluorescence parameters, such as net photosynthetic rate (A), stomatal conductance (gs), transpiration rate (Tr), internal CO2 concentration (Ci), intrinsic water-use efficiency (iWUE), minimal fluorescence (Fo), maximum fluorescence (Fm), maximum quantum efficiency of PSII primary photochemistry of dark-adapted leaves (Fv/Fm), maximum quantum efficiency of PSII primary photochemistry of dark-/light-adapted leaves (F’v/F’m), electron transport rate (ETR), non-photochemical quenching (NPQ), and the relative measure of electron transport to oxygen molecules (ETR/A), were measured. The application of Si drenching to trees that were subsequently exposed to cold stress reduced gs, Tr, and Ci but improved iWUE and Fo in both cultivars compared to the Si-untreated trees. In addition, specific adaptation mechanisms were found in the two citrus species; NPQ and ETR were improved in Si-treated Valencia trees, while A, Fm, and ETR/A were improved in Clementine trees under chilling stress conditions. The current research findings indicate the potential of Si application to enhance cold stress tolerance in citrus, which can provide a strategy for growing citrus in arid and semi-arid regions that may experience cold stress. Overall, after the application of silicon drenching, the cold-sensitive citrus Valencia cultivar became as cold-tolerant as the cold-tolerant Clementine cultivar. | en_US |
dc.description.department | Plant Production and Soil Science | en_US |
dc.description.sdg | SDG-02:Zero Hunger | en_US |
dc.description.sdg | SDG-13:Climate action | en_US |
dc.description.sdg | SDG-15:Life on land | en_US |
dc.description.sponsorship | The Citrus Research International (CRI) and the National Research Foundation (THRIP). | en_US |
dc.description.uri | https://www.mdpi.com/journal/agronomy | en_US |
dc.identifier.citation | Mvondo-She, M.A.; Mashilo, J.; Gatabazi, A.; Ndhlala, A.R.; Laing, M.D. Exogenous Silicon Application Improves Chilling Injury Tolerance and Photosynthetic Performance of Citrus. Agronomy 2024, 14, 139. https://doi.org/10.3390/agronomy14010139. | en_US |
dc.identifier.issn | 2073-4395 (online) | |
dc.identifier.other | 10.3390/ agronomy14010139 | |
dc.identifier.uri | http://hdl.handle.net/2263/97390 | |
dc.language.iso | en | en_US |
dc.publisher | MDPI | en_US |
dc.rights | © 2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). | en_US |
dc.subject | Abiotic stress | en_US |
dc.subject | Citrus | en_US |
dc.subject | Chlorophyll fluorescence | en_US |
dc.subject | Cold tolerance | en_US |
dc.subject | Physiological performance | en_US |
dc.subject | SDG-02: Zero hunger | en_US |
dc.subject | SDG-13: Climate action | en_US |
dc.subject | SDG-15: Life on land | en_US |
dc.title | Exogenous silicon application improves chilling injury tolerance and photosynthetic performance of citrus | en_US |
dc.type | Article | en_US |