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The effects of age, temperature and duration of exposure to temperature on susceptibility of pineapple to floral induction with ethephon

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Title: The effects of age, temperature and duration of exposure to temperature on susceptibility of pineapple to floral induction with ethephon
Authors: Conway, Michael James
Keywords: Pineapple
Floral induction
Issue Date: Dec 1977
Abstract: In pineapple (Ananas cornosus (L.) Merr.), the natural transition
from the vegetative apex (or from vegetative development) to the
initiation of reproductive structures occurs under a variety of
climactic, physiological and cultural conditions. Many years ago
it was shown that pineapple could be induced to initiate reproductive
development by the application of acetylene, ethylene or napthalene
acetic acid. However, numerous reports in the literature and local
experience showed that the susceptibility of the pineapple to chemical
induction of flowering was affected by many factors. These factors
include cultivar, size and/or age, temperature, water and nutrient
stress, light reception and a reduction in growth rate.
In areas where warm summers and frequent rains often produce
rapid vegetative growth, certain chemicals are known to be ineffective
as forcing agents. Variation in the susceptibility of certain cultivars
has also been observed and there are differences between treatments and
time of year application is made. Such variations result in inefficient
use of the labor force in the field and in the cannery. In addition,
it is often advisable to avoid forcing plants at certain times of the
year when fruit quality, size and shape are known to be affected. For
example, forcing with SNA during the summer will not only result in
delayed development of the inflorescence but elongated fruits low in
Brix and high in acid content. Ethylene, on the other hand, may be
used equally well throughout the year (W. G. Sanford, personal

Because of frequent failures in attaining high floral induction
percentages in the tropics, there is a need for studies using controlled
temperature to elucidate the relationship between climactic factors
and susceptibility to forcing. Little or no published information
was found on the relationship between the efficacy of a forcing agent
and plant age and temperature. A knowledge of how to grow a pineapple
plant which is or is not susceptible to floral induction could furnish
a good foundation on which to develop chemicals for the inhibition of
natural flowering. Such tests could also provide material for the
study of the physiology and biochemistry of the flowering process.
The main objective of this study was to evaluate the effects of
temperature and age on susceptibility of pineapple to flower induction
with ethephon. The diurnal variation in leaf resistances at varying
temperatures and growth stages and data on the effects of temperature
and age on titratable acids and leaf starch and nitrogen were collected
to provide basic information on plant response to treatment.
Pages/Duration: 110
Appears in Collections:CTAHR Masters Theses
M.S. - Agronomy and Soil Science

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