Analysis of seed vigor and germination of Toona ciliata M. Roem. var. australis

Abstract

Seed analysis tests should be performed under standard conditions for each species, so that the results can be reproducible anywhere. Seeds of the forest species Toona ciliata var. australis have been commercialized in Brazil despite no standard conditions for their analysis have been published. The objective was to determine basic information about temperature and photoperiod for the germination test and the imbibition time and volume of water for electrical conductivity. In the germination test the seeds were incubated at 15, 20, 25 and 30 °C with 0, 12 and 16 h of light. The electrical conductivity was evaluated up to 108 h after immersion of the seeds in 50 and 100 mL of deionized water. The conditions of 25 °C and 16 h of light provided higher amount of normal seedlings. At 15 °C all seeds remained hard regardless the photoperiod used, however, it became absent when light was added at higher temperatures. The electrical conductivity test should be performed with a volume of 50 mL and evaluated after 24 h of imbibition. It also showed a stronger correlation between normal seedlings, being a promising vigor evaluation test for this species.

Sequencing and analysis of the complete mitochondrial genomes of Toona sinensis and Toona ciliata reveal evolutionary features of Toona

“…Toona ciliata is a Grade II safeguarded plant, an important timber tree, and a therapeutic plant that has acquired broad consideration as of late (Dongmei et al 2015;Duanmu 1996;Li et al 2018;Li et al 2015). The roots, stems, and leaves of Toona ciliata can be utilized as medication and have successful restorative properties (Lucchese et al 2019;Nassur et al 2013;Parthiban et al 2019). The monetary worth of this variety is quite high, and it is generally utilized and has extraordinary potential for advancement and utilization (Ribeiro et Mitochondria are organelles in higher plant cells with a semi-autonomous genetic system that provides the majority of the energy required for cellular and other life activities (Baolong 2012 Plant mitochondrial genomes have been increasingly studied and more and more mitochondrial genomes have been sequenced in recent years, which is very important for studying the diversity of biological phenotypes, functional diversity, as well as species evolution.…”