Abstract
Abstract This study aimed to evaluate the plant growth regulator application, in different doses, on priming, with and without water restriction, in corn seeds. Evaluations were carried out in two periods (0 to 30 days of storage), with treatments consisting of seeds primed in water (0.0 MPa) and polyethylene glycol 6000 solution (-0.4 MPa), with or without plant growth regulator added in different doses, plus a control group. The amount of plant growth regulator was standardized by the gibberellic acid concentration in the commercial product, adopting the doses zero, 1, 2 and 3 mg of gibberellic acid. L-1 solution. After priming, the seeds were dried in an oven with forced air circulation for nine hours, and evaluated for water content, percentage and first count of germination, percentage of abnormal seedlings and non-germinated seeds, cold test, seedling length and dry weight and vigor index. Priming with water restriction -0.4 MPa, in solution of polyethylene glycol 6000, improves the vigor; however, the addition of plant growth regulator in priming does not provide increase in corn seeds quality. Corn priming in water, regardless the addition of plant growth regulator, reduces the ability of the seeds to withstand storage.
Highlights
In the management of corn crop, new technologies are constantly used, including the employment of enhanced cultivars associated with fungicides, nutrients or plant growth regulators application on the seeds (Silva et al, 2008), among others
Due to a longer storing period, seeds will be more susceptible to deterioration, the adoption of new techniques such as priming and the use of plant growth regulators can be used as important tools to increase the corn seeds effectiveness in the second year
The objective of this research was to evaluate the use of plant growth regulators in different doses through priming, with and without water restriction, in corn seeds
Summary
In the management of corn crop, new technologies are constantly used, including the employment of enhanced cultivars associated with fungicides, nutrients or plant growth regulators application on the seeds (Silva et al, 2008), among others. In order to avoid losses during storage, seed treatment occurs with seed processing, once corn seeds have high added value. When they are not used for sowing in the production year, they are repacked and stored until the crop, since the chemical treatment received impede the commercialization for alimentary purposes. Due to a longer storing period, seeds will be more susceptible to deterioration, the adoption of new techniques such as priming and the use of plant growth regulators can be used as important tools to increase the corn seeds effectiveness in the second year. Promising results were obtained with wheat seeds (Ghobadi et al, 2012), castor bean (Peixoto et al, 2011), onions (Yarnia and Tabrizi, 2012), rye (Ansari et al, 2013) and sweet corn (Rivera et al, 2011)
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