The overall aim of the project is to gain a deeper understanding of the underpinning mechanisms of vegetable seeds with morphological dormancy and from there to develop applied solutions for improving their quality. This project is therefore be at the very core of agriculture and food security of primary crop production. The student will be exposed to commercial application of world-class bioscience research – providing solutions for sustainably enhancing agricultural production. This PhD project is in collaboration with Tozer Seeds and is using celery seeds as a vegetable model for morphological dormancy. Tozer Seeds is an independent British vegetable breeding company located in Surrey that aims to provide consistent high quality seeds and services for the international market. Celery seed is one of their key products - they were the first company to develop a F1 hybrid variety - however, there are problems with celery seed quality. This problem can only be solved with knowledge of the underpinning mechanisms of morphological dormancy. This is a class of dormancy in which an underdeveloped tiny embryo is embedded into abundant living endosperm tissue. In order to germinate, the tiny embryo must first grow in size on the expense of the endosperm, but how this is achieved mechanistically is not yet known. This class of dormancy is very different to the many vegetable seeds with physiological dormancy of the Brassicaceae and Solanaceae families for which knowledge of the underpinning mechanisms exists. Morphological dormancy is the typical dormancy class for carrot, celery and other species of the Apiaceae family. The student will first conduct a morphological (microscopy, seed size fractions) and physiological (ambient conditions for seed imbibition with temperature and water as focus) investigation of morphological dormancy and its release with different genotypes. This will deliver the quantitative framework and target tissues for the biomechanical analysis combined with hormone and transcriptome profiling to elucidate the underpinning molecular mechanisms of morphological dormancy, its release, subsequent seed germination, and seedling establishment. This knowledge is instrumental for subsequently analysing the hormonal, epigenetic, and gene expression mechanisms underlying after-ripening storage, longevity and aging of celery seeds, as well as their importance for the production of sturdy and uniform seedlings. The possibilities of the Seed Biology team at RHUL and the collaboration with the company Tozer will provide superb training possibilities and will equip the student with skills that exploit novel ways of working. This studentship aims to establish celery as a model for seeds with morphological dormancy, and to develop diagnostic assays that identify molecular markers, critical for improving celery seed quality and breeding.
Applicants are expected to hold, or to be awarded a first class or a good upper second class BSc Degree, or an equivalent qualification by October 2016.
To make a general enquiry, please use the ’email’ link below. To request an application form please email [email protected]
Quote ’SBS studentship application form request’ in the subject field of the email.
Please note that we are keen to begin this project once we have found a suitable candidate. Therefore if we find a candidate before the deadline, we will close for futher applications from that time. Please therefore do not delay in submitting your application.
This BBSRC Industrial CASE studentship is fully funded for 4 years, which includes a short placement in a company. Funding covers (i) annual tax-free stipend at the standard Research Council rate (ii) contribution towards research costs, and (iii) tuition fees at the UK/EU rate. To be eligible for this studentship, applicant must either be a UK citizen or a European Union national who has been resident in the UK for at least 3 years prior to starting the degree. Please refer to BBSRC guide to studentship eligibility for detailed description of residence and qualifications criteria: http://www.bbsrc.ac.uk/documents/studentship-eligibility-pdf
• Graeber K, Linkies A, Steinbrecher T, Mummenhoff K, Tarkowská D, Turečková V, Ignatz M, Sperber K, Voegele A, de Jong H, Urbanová T, Strnad T, Leubner-Metzger G (2014). DELAY OF GERMINATION 1 mediates a conserved coat-dormancy mechanism for the temperature- and gibberellin-dependent control of seed germination. Proceedings of the National Academy of Sciences of the USA 111(34): E3571–E3580
• Graeber K, Voegele A, Büttner-Mainik A, Sperber K, Mummenhoff K, Leubner-Metzger G (2013). Spatiotemporal seed development analysis provides insight into primary dormancy induction and evolution of the Lepidium DELAY OF GERMINATION1 genes. Plant Physiology 161: 1903-1917
• Lee KJD, Dekkers BJW, Steinbrecher T, Walsh CT, Bacic A, Bentsink L, Leubner-Metzger G, Knox JP (2012). Distinct cell wall architectures in seed endosperms in representatives of the Brassicaceae and Solanaceae. Plant Physiology 160: 1551-1566
• Voegele A, Graeber K, Oracz K, Tarkowská D, Jacquemoud D, Turecková V, Urbanová D, Strnad M, Leubner-Metzger G (2012) Embryo growth, testa permeability, and endosperm weakening are major targets for the environmentally regulated inhibition of Lepidium sativum seed germination by myrigalone A. Journal of Experimental Botany 63: 5337-5350, doi: 10.1093/jxb/ers197
• Graeber K, Linkies A, Wood ATA, Leubner-Metzger G (2011). A guideline to family-wide comparative state-of-the-art qRT-PCR analysis exemplified with a Brassicaceae cross-species seed germination case study. The Plant Cell 23: 2045-2063
• Linkies A, Müller K, Morris K, Turečková V, Wenk M, Cadman CSC, Corbineau F, Strnad M, Lynn JR, Finch-Savage WE, Leubner-Metzger G (2009). Ethylene interacts with abscisic acid to regulate endosperm rupture during germination: a comparative approach using Lepidium sativum and Arabidopsis thaliana. The Plant Cell 21: 3803-3822