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Arabidopsis biomass accumulation -4

Growth rate of plant s was analyzed in two RIL populations, and genetic loci affecting growth have been identified. Near isogenic lines containing the loci of interest were made for future analyses of these genes controlling growth rate. Carbohydrate contents of leaves were analysed in order to reveal correlations between this parameter and growth rate. Growth appeared to be correlated with the accumulation of transient starch in the leaves.

The rate of photosynthesis in a wide range of accessions (ecotypes) appeared to be very constant, with one noticeable exception. This deviating behaviour turned out to be due to herbicide resistance of this accession, which is likely to be man-induced.

We exploited natural variation in Arabidopsis to unravel the genetics of accumulation of micronutrients (minerals) and anti-nutrional factors, viz. phytate. Loci for accumulation of phytate and phosphate, iron, zinc, and other minerals were found.

The loci controlling phytate accumulation appeared to be different from those affecting iron and zinc, indicating that breeding for increased mineral content is feasible without interfering accumulation of phytate.

Under stress (cold or salt) conditions, growth was severely hampered. The hypothesis that this reduction in growth was due to altered carbohydrate metabolism could not be substantiated.

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Wageningen University
Arboretumlaan 4
6703BD Wageningen
Netherlands
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