Qualidade fisiológica de sementes de feijão produzidas em solo compactado

Abstract

METHODS OF COMPARISON TO EVALUATE BROCCOLI SEED LOT VIGORABSTRACT -The vigor tests and germination test are essential components of seed quality control to the seed industry. This research was understaken to study an adequate method to estimate vigor in different seed lots and to predict seedling emergence on spedling trays. Five lots of broccoli 'Florida´ hybrid seeds were submitted to the following tests: germination; first germination count; primary root emission (48, 56, 72, 80, and 96 hour after sowing); seedling emergence on spedling trays; accelerated aging with water (1 g of seeds maintained at 41°C during 48 and 72 hours); accelerated aging with salt (the same procedure of last item, but using 40% NaCl solution); electrical conductivity (50 seeds in 25 mL of distilled water at 25 °C and evaluations after 2, 4, 6, 8, and 24 hours imbibition). All the tests presented significant correlation with emergence on spedling trays at 1% probability level. The accelerated aging tests with saturated salt solution during 48 hours and the electrical conductivity after 8 and 24 hours imbibitions showed similar results at emergence on spedling trays. The first germination count, primary root emission after 56 hours and accelerated aging with salt during 72 hours were more efficient than emergence on spedling trays to differentiate vigor among seed lots.

Medição do CO2 como método alternativo para a diferenciação do vigor de lotes de sementes de melancia

“…Portanto, o aumento nos índices de condutividade elétrica implica a maior concentração de solutos liberados das sementes e, consequentemente, acarreta reduções da qualidade fisiológica, o que está de acordo com o observado por MARTINS et al (2002).…”

“…O referido teste foi eficiente para a estratificação de lotes de sementes das espécies, tais como couve-brócolis (MARTINS et al, 2002), couve-flor (PAIVA et al, 2005) e melancia (ALMEIDA et al, 2010), sendo, atualmente, o teste rápido mais utilizado para avaliar o início do processo de deterioração das sementes, em função da quantidade de lixiviados liberados para a solução de embebição (MARCOS FILHO, 1999).…”

Adequacy of the Electrical Conductivity Test Methodology for Millet Seeds

“…Several factors may affect the results of the electrical conductivity test, such as: time and temperature of imbibition; Seed size; Initial seed water percentage, number of seeds in the sample; and the genotype (Vieira & Kryzanowski, 1999;Martins et al, 2002;Gaspar & Nakagawa, 2002;Dutra & Vieira, 2006). In this way, has aroused the interest of technologists and seed researchers to study the methodology for different species.…”

Assessment of the physiological potential of super sweet corn seeds

“…There is research with other species, such as tomatoes (Martinelli-Seneme et al, 2004), cabbage-broccoli (Martins et al, 2002) and pepper (Demir et al, 2008), which describe the possible use of the primary root protrusion test to evaluate vigor.…”