INFLUENCE OF SEED STORAGE CONDITIONS ON QUALITY OF Torresea acreana SEEDLINGS

Cristiane Helm,ALESSANDRO CAMARGO ANGELO,DAVI DA SILVA,IVAR WENDLING,CARLOS ANDRÉ STUEPP

doi:10.1590/01047760201925012611

Cristiane Helm, ALESSANDRO CAMARGO ANGELO + Show 3 more

Open Access

https://doi.org/10.1590/01047760201925012611

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Abstract

ABSTRACT The plant vigor defined in the laboratory may not indicate the final quality of seedlings produced under nursery conditions, or even their survival in plantations. So, we evaluated the influence of the storage conditions of Torresea acreana seeds on its emergence, as well as, on the morphological quality of produced seedlings. Seeds were collected in October/2011, packed, transported, conditioned in closed glas pots and stored in three environments for a period of 462 days. The treatments consisted of seedlings produced from seeds: 1 - without storage (control), 2 - stored in a dry chamber, 3 - stored in a humid chamber, and 4 - stored in an uncontrolled environment (laboratory). Sowing was performed in 50 cm³ plastic tubes filled with decomposed pine bark and coconut fiber (50/50 v/v) which were packed in a glasshouse. The study analyzed the percentage of emergence, mean seedlings emergence time, stem diameter, total height, ratio between total height and stem diameter, shoot length, mean root length, total dry biomass, root dry biomass, shoot dry biomass, and Dickson quality index. Seed storage proved to be a negative factor for the emergence and vigor of T. acreana seedlings. The vigor of the seeds is a preponderant factor to increase the morphological quality of the seedlings.

Highlights

The seeds submitted to storage for 462 days presented percentage of seedlings emergence below 50%, with a slight reduction as a function of the storage environment, which was better when stored in a dry chamber (Table 1)
Means followed by the same letter in the column do not differ from each other, according to Tukey’s test at 5% probability level
T1 - Seeds without storage; T2 - Seeds stored in dry chamber for 462 days; T3 - Seeds stored in a humid chamber for 462 days; T4 - Seeds stored in an uncontrolled environment for 462 days

Summary

Introduction

The demand for native forest seedlings is growing, because of legal issues, mainly for restoration of legal reserves and recovery of degraded ecosystems (Brazil, 2012; Wielewicki et al, 2006; Ribeiro-Oliveira and Ranal, 2014).Faced with this situation, the need for large-scale production of quality seedlings with reduced costs is increasing.For the production of quality seedlings, it is necessary to store large quantities of seeds for long periods of time.This fact becomes even more important when working with species that present seasonality in fruit production, that is, a year of good production is usually succeeded by a year of low production (Oliveira et al, 2017), in general, influenced by the climatic variation inherent in the region of origin (Marques et al, 2004).The demand for quality seedlings comes from the need to avoid losses from mortality and low growth after planting, together with the need to reduce the cultural treatments applied to the plants resulting in a competition reduction with invasive plants (Figueiredo et al, 2011; Dumroese et al, 2011). The demand for native forest seedlings is growing, because of legal issues, mainly for restoration of legal reserves and recovery of degraded ecosystems (Brazil, 2012; Wielewicki et al, 2006; Ribeiro-Oliveira and Ranal, 2014). Faced with this situation, the need for large-scale production of quality seedlings with reduced costs is increasing. For the production of quality seedlings, it is necessary to store large quantities of seeds for long periods of time. The quality of a seedling can be evaluated through the measurement of morphological characters such as shoot height, stem diameter, development of the root system, stem lignification, and genetic material (Figueiredo et al, 2011; Pezzutti et al, 2011)

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