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Optimização da conservação da lande e seu efeito na qualidade das plantas do sobreiro (Quercus suber)
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Autores
Orientador(es)
Resumo(s)
Rapid loss of viability of cork oak (Quercus suber L.) recalcitrant acorns
represents one of the limitations to their regeneration. The cold storage
procedure (2-4ºC) recommended for extending seed longevity of Quercus genus
proved ineffective: the harvest is totally lost within 3 months of storage and the
processing costs are very high. The main objective of this study was the
optimization of acorns storage for a minimum period of 6 months in order to
permanent availability of high quality reproductive materiel and, consequently, to
enhance the reforestation success.
We performed the acorns storage taking in account the mother-tree and bag
type, and assessed their physiological behavior, before and at different times of
storage, to understand the biology process and the impact of tree-mother in
storing success. In parallel, we assessed the effect of storing on the seedling
quality. Then we monitored the acorn maturation to set the right time for
harvesting and assessed its initial sanitary quality as well as its effect on the
seedling vigor. In order to demonstrate the storage technique and inform against
its limitations, we analyzed the acorn quality at two storage levels (5 and 17
months). In the context of implementation of the technique, we assessed the
effect of nursery time production (NTP) and fertilization on the seedling growth
potential.
A new procedure of cork oak acorn wet-cold storage was developed for a period
of 12-15 months (12-15MC) and implemented at real scale with developing an
efficient prototype of acorn processing. The technologic process was patented®
and amend radically the usual seed storage procedure. The effectiveness of
long-term storage depends on the maturation control which guarantees the initial
acorn quality, on the accuracy and speed of treatments (thermotherapy and
drying) and on the storage conditions improvement. The quality of acorn and
seedling from this innovation was significantly improved when compared to the
usual reproductive material. Hence, germination of stored acorn becomes rapid
and uniform and root growth potential (PCR) of subsequent seedling was
significantly higher than the conventional seedling and similar to the fertilized
one.
Descrição
Doutoramento em Engenharia Florestal - Instituto Superior de Agronomia
Palavras-chave
Quercus suber cork oak acorn storage forest reproductive material assisted regeneration
Contexto Educativo
Citação
Merouani, Hachemi - Optimização da conservação da lande e seu efeito na qualidade das plantas do sobreiro (Quercus suber). Lisboa, ISA, 2011