Ethylene is required for climacteric fruit ripening. Inhibition of ethylene biosynthesis genes, 1-aminocyclopropane-1-carboxylate (ACC) synthase and ACC oxidase, prevents or delays ripening, but it is not known how these genes are modulated during normal development. LeHB-1, a previously uncharacterized tomato homeobox protein, was shown by gel retardation assay to interact with the promoter of...

It has been generally thought that in ethylene-sensitive plants such as carnations, senescence proceeds irreversibly once the tissues have entered the climacteric phase. While pre-climacteric petal tissues have a lower sensitivity to ethylene, these tissues are converted to the climacteric phase at a critical point during flower development. In this study, it is demonstrated that the senescence...

The daylily flower, Hemerocallis hybrid cv Cradle Song, develops from the opening bud to full senescence in 36 hours. Unlike other ephemeral flowers studied to date, it does not respond to ethylene, but other senescence phenomena are similar. There was a small respiration climacteric coinciding with early flower senescence, and it was also observed in isolated petals and petal slices. Cyclohexi...

cDNA and genomic clones encoding a strawberry (Fragariaxananassa cv. Chandler) non-specific lipid transfer protein (Fxaltp gene) were isolated and characterized. The spatio-temporal expression pattern and structural features of this gene were studied for the first time in strawberry, a non-climacteric fruit of agricultural importance. The architecture and the encoded amino acid sequence of this...

Pollination of flowers induces a suite of developmental events that lead to successful production of seeds. These events may include senescence of nonessential floral organs, development of the ovary and accessory structures, and floral color changes that serve as cues to pollinators. Many of these processes are mediated through the plant hormone ethylene, which is induced following pollination...

Cantaloupe melons have a typical climacteric behaviour with ethylene playing a major role in the regulation of the ripening process and affecting the ripening rate. Crossing of Cantaloupe Charentais melon with a non-climacteric melon indicated that the climacteric character is genetically dominant and conferred by two duplicated loci only. However, other experiments made by crossing two non-cli...

Fruits can be divided into two groups according to the regulatory mechanisms underlying their ripening process. Climacteric fruit, such as tomato, apple, pear, and melon are characterized by a ripening-associated increase in respiration and in ethylene production, the phytohormone ethylene being the major trigger and coordinator of the ripening process. By contrast, nonclimacteric fruits, such ...

Time is a vehicle that can be used to represent aging-related processes and to index the amount of aging-related resources or burdens individuals have accumulated. Using data on cognitive (memory) performance from two Swedish studies of the elderly (OCTO and OCTO-TWIN), we illustrate how time-as-process and time-as-resources/burdens time metrics can be articulated and incorporated within a grow...

Life changes have been associated with illness onset. The Social Readjustment Rating Scale (SRRS) records numerical perceptions of the meaning of life events while the Schedule of Recent Experience (SRE) records the frequency of occurrence of life events. Data on these two instruments from 19 studies done in this laboratory have been surveyed and analyzed. They reveal significant variability am...