Effect of seed treatment with an oligogalacturonide mixture on tomato (Lycopersicon esculentum Mill) seedling growth
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Abstract
Thus, obtaining healthy and vigorous plantlets is vital to
guarantee good yields, both under field conditions and
greenhouses; hence, researches directed to stimulate tomato
plantlet growth and vigour at the nursery stage are of great
scientific and economical interest. The aim of this work was to
evaluate the effect of treating tomato seeds with an
oligogalacturonide mixture (DP 7-16) on plantlet growth within
two sowing dates. Two trials were performed under
semicontrolled conditions: November (optimal season) and
February (non-optimal season). Tomato seeds (Lycopersicon
esculentum Mill) from. Amalia var. were immersed in aqueous
solutions of 0, 1, 5 and 10 mg.L-1 of the oligogalacturonide
mixture during four hours. Afterwards, they were seeded in
5-L-pots containing a soil-organic matter mixture (1:1 v/v). Then,
15 days after germination, plant height, stem diameter, leaf
number as well as fresh and dry weights per organ were
determined between 26 and 30 days. Regarding the experiment
from November, the contents of leaf soluble proteins and
chlorophylls (a+b) were also evaluated. In both experiments,
seed treatment with water did not modify any of the variables
analyzed; however, oligosaccharide mixture, at certain
concentrations, enhanced plant growth, the response being
more evident in the experiment from February.
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