article · Journal of Agricultural Science
This study investigated the mechanisms behind Striga hermonthica tolerance in Maseno EH14, a hybrid maize variety, by analysing its root exudates. Striga, a parasitic weed, causes significant maize yield losses in sub-Saharan Africa, with its seeds germinating in response to host plant strigolactones. Researchers compared Maseno EH14 with a susceptible variety (PHB3253) and another tolerant variety (EH11), using germination assays and HPLC analysis of root exudates. Maseno EH14 exhibited the lowest Striga seed germination (20.08%) and shortest radicle length (0.38 mm) compared to other varieties and a synthetic stimulant. HPLC analysis revealed that Maseno EH14 lacked 5-Deoxystrigol, a strigolactone commonly associated with Striga susceptibility, suggesting its tolerance stems from reduced germination stimulation.
Striga is a devastating parasitic weed for maize crops in Africa, threatening food security. Understanding how certain maize varieties resist Striga, by identifying specific chemical mechanisms, is crucial. This research provides insights that can inform the development of more resilient maize varieties, helping farmers combat this persistent agricultural challenge.
This research identifies a specific biochemical mechanism for Striga resistance in an existing maize hybrid, Maseno EH14. This understanding could inform future plant breeding programmes, enabling the development of new or improved Striga-tolerant maize varieties for farmers in sub-Saharan Africa. The work is early-stage research, elucidating a mechanism rather than presenting a ready-for-market product, but it provides valuable knowledge for agricultural biotechnology and crop improvement.
AI-generated from the published abstract. Always read the original work before citing.
The parasitic Striga hermonthica weed causes serious yield losses to maize (Zea mays L.) in sub-Saharan Africa. Striga seeds are stimulated to germinate by strigolactones produced by the host plants. Maseno EH14 and EH11 hybrid maize varieties have been bred for Striga and foliar diseases tolerance respectively but their tolerance mechanisms have not been elucidated. The study investigated the activity and chemical composition of root exudates of the maize varieties alongside a Striga susceptible PHB3253 variety on Striga seed germination. Germination assays were carried out using crude maize root exudates alongside the synthetic GR24 stimulant. Germination frequencies and radicle lengths were analyzed using ImageJ v. 1.45. Data were subjected to ANOVA through the linear model of SAS and means were separated using LSD0.05. The root exudates were also freeze-dried and subjected to HPLC analysis. Maseno EH14 had the lowest Striga seed germination at 20.08% compared to PHB3253 at 51%, EH11 at 37.54% and GR24 at 76.96%. Maseno EH14 also had the shortest radicle length at 0.38 mm against PHB3253 at 0.82 mm, EH11 at 0.71 mm, and GR24 at 0.91 mm. HPLC analysis showed PHB3253 and Maseno EH11 exuding mainly 5-Deoxystrigol and two other compounds while EH14 had three peaks that did not correspond to any of the standard strigolactones used in the analysis. Maseno EH14 therefore exhibits tolerance to Striga hermonthica due to low stimulation of Striga seed germination, and the absence of the more stable 5-Deoxystrigol strigolactone which is commonly associated with Striga susceptibility in maize.
This page summarises published work. The authoritative version sits with the publisher.
DOI: 10.5539/jas.v18n9p63
Is something wrong with this record? Report it or request removal.
Discussion
Have you built on this work, tried to replicate it, or seen it applied in practice? Share what you know. Verified researchers and MARATTO™ domain experts can open a discussion, and any member can reply. Contributions are reviewed before they appear.
No discussion yet. Open the first thread.
New to MARATTO™? Create a free account.
