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Ismail A. Hussein and Donald C. Slack

The effect of three vigor-control apple (Malus domestics Borkh.) rootstock (seedling, MM.106, and M.7a) on fruit diameter of three cultivars ('Red Delicious', `Granny Smith', and `Gala') was studied over two growing seasons (1990-91) in the arid climate of Willcox, Ariz. Daily fruit growth rate (DFGR) and effective fruit growth period (EFGP) data indicate cultivar differences in DFGR as well as EFGP. Cultivars with a high DFGR had a relatively shorter EFGP. Rootstock had no significant effect on EFGP. Cultivar x rootstock interaction on fruit diameter was significant for DFGR, but not for EFGP. `Red Delicious' and `Granny Smith' trees produced larger fruits on MM.106 and M.7a than on seedling rootstock. For `Gala', there was no significant effect of all rootstock on fruit diameter.

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Duane W. Greene

86 WORKSHOP 11 (Abstr. 682-684) Dynamics of Fruit Growth Tuesday, 25 July, 10:00 a.m.-12:00 noon

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Hans-Peter Kläring and Angela Schmidt

thermophile cucumber is known to be very sensitive to low temperature. In particular, fruit growth rate is considerably decreased as temperature declines ( Marcelis, 1993 ), especially when the temperature is low during the early stages of fruit development

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A. Maaike Wubs, Yun T. Ma, Ep Heuvelink, Lia Hemerik, and Leo F.M. Marcelis

In many cases, it is desirable to quantify the growth of horticultural products with functions (e.g., to analyze growth differences between treatments or as an input for crop simulation models). In all cases, measurements of fruit growth and

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Madhumita Dash, Lisa K. Johnson, and Anish Malladi

Shading during early apple fruit development decreases fruit growth and induces fruit abscission and has been used to understand processes that affect thinning ( Byers et al., 1985 , 1990a , 1990b , 1991 ). During early fruit development, active

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Lili Zhou and Robert E. Paull

Papaya (Carica papaya L.) fruit flesh and seed growth, fruit respiration, sugar accumulation, and the activities of sucrose phosphate synthase (SPS), sucrose synthase (SS), and acid invertase (AI) were determined from anthesis for ≈150 days after anthesis (DAA), the full ripe stage. Sugar began to accumulate in the fruit flesh between 100 and 140 DAA, after seed maturation had occurred. SPS activity remained low throughout fruit development. The activity of SS was high 14 DAA and decreased to less than one-fourth within 56 DAA, then remained constant during the remainder of fruit development. AI activity was low in young fruit and began to increase 90 DAA and reached a peak more than 10-fold higher, 125 DAA, as sugar accumulated in the flesh. Results suggest that SS and AI are two major enzymes that may determine papaya fruit sink strength in the early and late fruit development phases, respectively. AI activity paralleled sugar accumulation and may be involved in phloem sugar unloading.

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Cindy B.S. Tong, Hsueh-Yuan Chang, Jennifer K. Boldt, Yizhou B. Ma, Jennifer R. DeEll, Renae E. Moran, Gaétan Bourgeois, and Dominique Plouffe

fruit growth. This study was undertaken to determine how the environmental factors of temperature and precipitation, as well as physiological disruptions are associated with diffuse flesh browning of cold-stored ‘Honeycrisp’ fruit, and to what extent

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Alan N. Lakso

Fruits of different species grow in different patterns (such as the “double sigmoid” of stone fruits and grapes or the apparent single sigmoid of apples), and each has periods of cell division followed by periods of only cell expansion. It should not be expected that one mathematical growth description would hold for all species, or even at all times of the season for one species. Perhaps hybrid growth models need to be developed, although specific questions asked about fruit growth may be satisfactorily answered with models of only parts of the fruit growth period of interest.

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Madhumita Dash, Lisa Klima Johnson, and Anish Malladi

Fruit growth in apple and other fruits is greatly dependent on and often limited by carbohydrate availability ( Bertin et al., 2002 ; Lakso et al., 1998 , 1999 ). In apple, fruit growth is sensitive to carbohydrate limitation during early (≈2 to 3

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Brunella Morandi, Luigi Manfrini, Marco Zibordi, Massimo Noferini, Giovanni Fiori, and Luca Corelli Grappadelli

Fruit growth dynamics has received little attention over the years. Knowledge of the daily variations in fruit size in response to environmental and physiological conditions is highly desirable, but it is hampered by the technical difficulty of