177,813 research outputs found
The Long Tail Perspective for Niche Communities Online: a Framework for Brand Loyalty Measurement
No full textThe effect of summer shading on flower bud morphogenesis in apricot (Prunus armeniaca L.)
No full textCaratterizzazione carpologica e bio-agronomica di nuovi genotipi di olivo ottenuti da incrocio programmato.
No full textApricot flower bud dormancy: main morphological, anatomical and physiological features related to winter climate influence.
No full textThis review examines recent advances regarding flower bud dormancy in apricot, focusing on biological, anatomical,
and physiological processes which occur during the induction and depth of dormancy. In a scenario of global
climate change, the relationship between endodormancy and winter climate influence is discussed. Dormancy regulation
is a complex process necessary for plant survival and development. In fruit species, the knowledge of mechanisms controlling
dormancy and establishing its release appears crucial for successful yields. Specific studies have suggested that,
when the flower buds are apparently inactive, slow and gradual changes occur in the whorls: organogenesis, such as
microsporogenesis processes and vascular connections take place during the entire dormancy period. It has been indicated
that an asynchronism between biological (i.e. endodormancy release, microsporogenesis evolution), anatomical (i.e.
xylem vessel differentiation) and biochemical (i.e. changes in metabolic compounds and enzymes) events could represent
further causes determining an inconstant rate of blooming. Temperature is the main factor involved in dormancy triggering
and releasing. In the perspective of global warming, mild winter temperatures could greatly impact apricot ecological
cropping systems. Phenological process-based models are considered to be the best tool to study the climatic changes and
subsequent expected phenology variation (dormancy and flowering). A new model, calibrated and validated on apricot
cultivars, is proposed to predict the dormancy release date in a future scenario
Apricot flower bud dormancy: main morphological, anatomical and physiological features related to winter climate influence.
No full textAppropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Flower bud frost tolerance of several italian apricot genotypes
No full textIn the Tyrrhenian coastal area, frequent late frosts
have occurred during the last ten years. The most severe
event happened in 2003, causing a strong reduction
in yield, above all in stone fruit species. However,
several apricot selections, from different breeding
sources, had a considerable yield, as a consequence of
high flower and/or young fruit survival. The aim of
this research was to evaluate the degree of tolerance to
spring frost of ten selections and their own parents.
During three subsequent years, the frost sensitivity of
flower buds at dormant and swelling phenological
stages was determined using the Phenolic Compound
Leakage (PCL) test after an artificial frost treatment
(–4 °C). When this temperature was applied to flower
buds at the dormant stage did not cause significant injuries,
as indicated by the low PCL values. At the
pre-flowering stages a significant increase in PCL was
observed in most genotypes. On the basis of different
levels of PCL, the genotypes were classified into three
groups in relation to their frost sensitivity: i) very
frost-tolerant; ii) frost-tolerant and iii) frost-sensitive.
Within the very frost-tolerant group, the selections 7C
20/3, 11/48/7 and 11/19/2, were the best genotypes
confirming a good yield performance recorded after
the severe spring frost of 2003
Apricot flower bud development: main biological, physiological and environmental aspects related to the appearance of anomalies
No full textApricot (Prunus armeniaca L.) is a fruit species that, in certain cultivation area, shows several problems related to floral biology,
appearance of flower bud anomalies, inconstant and extremely low yield. In this review, environmental, biological and physiological
aspects affecting flower bud development are discussed and the complex phenomena of flower bud anomalies are analyzed. Three phases
of the whole flower bud development periods are considered: 1) from flower bud initiation to beginning of dormancy; 2) from deep
dormancy to bud swelling; 3) from beginning of flowering to petal drop. The early appearance of flower bud anomalies is related to the
first growth period, involving flower bud induction, differentiation, organogenesis and beginning of dormancy, when several
environmental and agronomical factors can heavily modify these processes. The second flower bud growth period is characterized by the
dormancy phase followed by the resumption phase, when bud dormancy release occurs. Several types of anomalies have been observed
when the buds are still dormant and also at the end of dormancy. During the third period, the development of the female and male
gametophyte is completed and all organs are functional. At this time, the appearance of anomalies determines significant problems, such
as morphological abnormalities of pistil, stamen, and a reduction of male and female fertility
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