Abstract
The efficiency of vigor tests in assessing the physiological potential of seeds depends on their standardization for different species. In this context, the research aimed to study specific methodologies to evaluate the vigor of spinach seeds (Tetragonia tetragonoides). For this purpose, five lots of spinach seed cv. New Zealand were submitted to germination, first count of germination, seedling emergence in the field, accelerated aging (with and without use of saturated solution of NaCl at 41and 45 ºC for 24,48 and 72 hours), controlled deterioration (18,21 and 24% seed water content adjustments for 24 hours at 45 ºC) and electrical conductivity tests with variations inwater volume (25, 50 and 75 mL), seed quantity (25 and 50) and soaking period (1, 2, 4, 8,12, 16 and 24 hours) at 25 ºC. The first count test allowed obtaining preliminary information about seed vigor, and other tests in general showed similarity with seedling emergence in the field. Thus, it was concluded that traditional accelerated aging test 24 h /41 ºC and accelerated aging test with saturated salt solution for 24 h at 41 ºC and 45 ºC, and controlled deterioration test with 21% seed water content / 24 h / 45 ºC were all efficient for evaluating the physiological potential of spinach seeds.
Highlights
The species Tetragonia tetragonoides (Pall.) Kuntze, belonging to the Aizoaceae family, is originally from New Zealand and Australia
There is a distinction in the germination percentage, all lots showed average percentage above the minimum established (55%) in the standards for marketing spinach seeds (ABCSEM, 2012)
Lots 3 and 4 were superior on the physiological potential in most periods and the inferiority of lot 5 was confirmed, demonstrating similarity to the results found in other tests
Summary
The species Tetragonia tetragonoides (Pall.) Kuntze, belonging to the Aizoaceae family, is originally from New Zealand and Australia. It is a plant of creeping growth habit, semi-herbaceous, succulent, branched, woody at the base and bright green. The leaves are fleshy, triangular-shaped, arranged alternately and dark green. The inflorescences are axillary, with one to three flowers, which may be uni or bisexual, of green to yellow color. The fruits are drupe, indehiscent, with small horns. The propagation is made in trays, and when the seedlings have four to five leaves, they should be transplanted to a permanent site (Filgueira, 2000)
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