Defra - Department for Environment, Food and Rural Affairs.

Science Search

Science and Research Projects

Return to Science Search homepage   Return to Project List

Nutrient supply, growth and developent of field vegetables. - HH1408SFV

Description
The main objective of this research is to determine the effects of nutrient supply on assimilation processes and morphological development in plants. This objective will be met through experimental work on a variety of vegetable crops grown under patterns of sub-optimal and optimal N, P and K supply. Results from this project will provide an understanding of the effects of uptake and utilisation of nutrients on plant physiological and morphological processes, and how these interact to influence final yield. Data will be used to establish new relationships and models on the effects of nutrient supply on the reponses of selected vegetable crops. Two model Brassicaceae systems (an Arabidopsis thaliana recombinant inbred mapping population and a Brassica oleracea doubled-haploid mapping population) will also be used to identify genetic loci influencing the physiological and morphological responses to nutrient utilisation. These could become targets for future breeding programmes to improve the nutrient-use efficiency of crops.

Objective
The overall aim of this project is to determine the effects of nutrient supply on plant physiological processes and morphological development, and how this in turn affects crop growth and development. This aim will be met by addressing three working hypotheses:

• Nutrient supply directly limits physiological processes and morphological development in plants.

• The interaction between physiological processes and morphological development differs for N, P and K supply and between different crops.

• Model Brassicaceae systems can be used to identify genetic loci influencing physiological and morphological responses of plants to nutrient uptake and utilisation.



These hypotheses will be tested by addressing a series of five specific objectives:


1. To quantify the relationships between N, P and K supply, assimilation processes and morphological development in lettuce.

2. To determine the spatial and temporal distributions of the main chemical forms of N, P, K and replacement elements in lettuce, under reduced N, P and K supply.

3. To develop models of plant growth as a function of N, P and K supply, and plant-tissue element concentrations.

4. To develop and extend the principles of standard growth analyses to establish new quantitative relationships between nutrient supply, whole-plant growth, plant development and crop yield for lettuce, cabbage, French bean and cauliflower.

5. To identify genetic loci impacting on P-uptake and utilisation in two model Brassicaceae systems; an Arabidopsis thaliana recombinant inbred mapping population and a Brassica oleracea doubled-haploid mapping population. (Extra objective, agreed December 1999; amended November 2001)



Project Documents
• Final Report : Nutrient supply, growth and developent of field vegetables.   (734k)
Time-Scale and Cost
From: 1999

To: 2002

Cost: £524,978
Contractor / Funded Organisations
Horticulture Research International
Keywords
Farming              
Horticulture              
Vegetables              
Fields of Study
Horticulture
Horticulture