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Topic: Parthenocarpy

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  Parthenocarpy - Wikipedia, the free encyclopedia
In botany and horticulture, parthenocarpic literally means virgin fruit; the fruit develops without fertilization of ovules, therefore it is seedless.
Parthenocarpy occasionally occurs as a mutation in nature, but it is a defect, as the plant can no longer reproduce.
Humans, however, often see seedlessness as a desirable quality and have selected and artificially propagated parthenocarpic varieties of many plants, including citrus, banana, cucumber, and eggplant.
en.wikipedia.org /wiki/Parthenocarpic   (135 words)

 Inheritance of parthenocarpy in summer squash (Cucurbita pepo L.)
These results indicate that parthenocarpy is controlled by a single locus, with incomplete dominance in the direction of parthenocarpic expression.
Parthenocarpy involves development of the ovary into a fruit without fertilization and seed formation, under the influence of exogenous hormones or endogenous genetic stimuli.
Parthenocarpy in summer squash has received less attention, but may enable squash to be grown in greenhouses and in the field out-of-season, when staminate flowers or pollinating insects may be absent.
funpecrp.com.br /gmr/year2005/vol1-4/gmr0093_full_text.htm   (2017 words)

 MARIJUANA OPTICS: An elaboration on the process that makes THC
In marijuana parthenocarpy, the floral bract (the fruit) enlarges in size as though there were a seed growing inside, and the capitate-stalked glandular trichome is triggered into growth on the floral bract and concomitant leaves.
Marijuana parthenocarpy occurring before the autumnal equinox is considered by the author to be "long-day" and marijuana parthenocarpy occurring after the autumnal equinox to be "short-day".
If this is the case, pollination is used instead of parthenocarpy to trigger the growth of the capitate-stalked glandular trichome before the autumnal equinox to obtain as much fully realized THC as possible in the harvested resin spheres by the time the majority of the seeds are ripe.
marijuana-optics.greatnow.com   (2199 words)

 parthenocarpy --  Encyclopædia Britannica
Varieties of the pineapple, banana, cucumber, grape, orange, grapefruit, persimmon, and breadfruit exemplify naturally occurring parthenocarpy.
(Formation of fruit without the fertilization of an egg and seed development is called parthenocarpy.) A fruit is a ripened ovary (or compound ovary) and any other structure, usually the hypanthium, that ripens and forms a unit with it.
The maturation of sporophytes and gametophytes, as manifested by their ability to produce spores and gametes respectively, involves both internal and environmental factors.
www.britannica.com /eb/article-9058584   (343 words)

 Parthenocarpy in hybrids L. esculentum x L. pennellii.   (Site not responding. Last check: 2007-10-22)
Parthenocarpy in hybrids L. esculentum x L. pennellii.
As a result of interspecific hybridization between L. esculentum and L. pennellii lines with highly parthenocarpic fruit were obtained.
These results suggest that the parthenocarpy of these lines was genetically determined.
tgc.ifas.ufl.edu /vol35/v35p19a.html   (149 words)

 Parthenocarpy   (Site not responding. Last check: 2007-10-22)
The parthenocarpy is the process of fruit development in the absence of pollination/fertilization of ovules.
Parthenocarpic fruit are found only in a small number of species, such fruits are seedless.
Humans, however, often see seedlessness as a desirable quality and have selected and artificially propagated parthenocarpic varieties of many plants, including citrus, banana and cucumber.
www.cactus-art.biz /note-book/Dictionary/dictionary_parthenocarpy.htm   (83 words)

 The Gene pat-2, Which Induces Natural Parthenocarpy, Alters the Gibberellin Content in Unpollinated Tomato Ovaries -- ...
Philouze J (1983) Parthenocarpie naturelle chez la tomate.
Sjut V, Bangerth F (1982) Induced parthenocarpy: a way of changing the levels of endogenous hormones in tomato fruits (Lycopersicon esculentum Mill.): 1.
Vardy E, Lapushner D, Genizi A, Hewitt J (1989) Genetics of parthenocarpy in tomato under a low temperature regime: II.
www.plantphysiol.org /cgi/content/full/122/2/471   (4705 words)

 CGC 6:84-85   (Site not responding. Last check: 2007-10-22)
Selection for parthenocarpy was successful and a breeding line with high tendency to parthenocarpic fruit set under Dutch early spring glasshouse conditions was offered to interested breeders.
The hybrid progeny Poseidon x DG-4 behaved similarly to ‘Poseidon’ with respect to parthenocarpy, although it was intermediate for other plant and fruit characters.
We consider this as preliminary evidence that the high level of parthenocarpy in DG-4 is a recessively inherited character.
www.umresearch.umd.edu /CGC/cgc6/art/CGC6-42.html   (457 words)

 Genetic Analysis of Growth-Regulator-Induced Parthenocarpy in Arabidopsis -- Vivian-Smith and Koltunow 121 (2): 437 -- ...
parthenocarpy was blocked in the mutant gai background.
Pike LM, Peterson CR (1969) Inheritance of parthenocarpy in the cucumber (Cucumis sativus L.).
Vercher Y, Carbonell J (1991) Changes in the structure of ovary tissues and in the ultrastructure of mesocarp cells during ovary senescence or fruit development induced by plant growth substances in Pisum sativum.
www.plantphysiol.org /cgi/content/full/121/2/437   (7332 words)

Satsuma mandarin, known to possess obligatory parthenocarpy, was crossed with 20 different cultivars.
The genetic analyses of the different populations point to the possibility of polygenic inheritance of juvenility, support the self-incompatibility model proposed by Soost (1965, 1969), and suggest that the S allele of Satsuma differs from the two S alleles of Ellendale and one of the S alleles of Clementine.
In addition, we suggest that obligatory parthenocarpy in Citrus depends on three dominant complementary genes.
www.actahort.org /books/535/535_24.htm   (203 words)

 ARS | Publication request: Variance Component Analysis of Parthenocarpic Character in a Processing Cucumber (Cucumis ...   (Site not responding. Last check: 2007-10-22)
The inheritance of parthenocarpy in cucumber is not well understood, and thus a genetic analysis was performed on F3 cross-progeny resulting from a mating between the processing cucumber inbred line 2A (P1, gynoecious, parthenocarpic, indeterminate) and line Gy8 (P2, non-gynoecious, parthenocarpic, indeterminate).
The minimum number of effective factors controlling parthenocarpy was estimated to range between 5 (G-block) to 13 (E-block).
These results suggest that the response to direct selection of individual plants for improved parthenocarpy character will likely be slow and difficult.
ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=170025   (377 words)

 Re: Parthenocarpy, Seedless Pineapples and Tissue Culture?   (Site not responding. Last check: 2007-10-22)
Parthenocarpy in plants is not the same at all as parthenogenesis in animals, which usually results in offspring identical to the single parent.
An example of animal parthenogenesis is in aphids where live young are produced with no meiosis and fertilization.
Parthenocarpy usually results in no offspring because there are no seeds.
www.madsci.org /posts/archives/may2002/1020732824.Bt.r.html   (441 words)

 Scientific American: How do seedless fruits arise and how are they propagated?   (Site not responding. Last check: 2007-10-22)
Fruit development normally begins when one or more egg cells in the ovular compartment of the flower are fertilized by sperm nuclei from pollen.
But there are side shoots or suckers at the base of the main stalk, which can be removed and replanted to continue the cultivar.
Plant breeders produce triploid seed by crossing a normal diploid parent with a tetraploid parent, which itself is made by genetically manipulating diploids to double their chromosome number.
www.sciam.com /print_version.cfm?articleID=000BA236-622C-1C72-9EB7809EC588F2D7   (498 words)

 parthenocarpy --  Britannica Concise Encyclopedia - The online encyclopedia you can trust!
Seedless parthenocarpic fruit can be induced in nonparthenocarpic varieties and in naturally parthenocarpic varieties out of season by a type of artificial pollination with dead or altered pollen or by pollen from a different type of plant.
The application of synthetic growth substances in paste form, by injection, or by spraying, also causes parthenocarpic development.
"parthenocarpy." Britannica Concise Encyclopedia from Encyclopædia Britannica Premium Service.
www.britannica.com /ebc/article-9058584   (397 words)

 The parthenocarpic fruit (pat) mutant of tomato (Lycopersicon esculentum Mill.) sets seedless fruits and has aberrant ...
Among the different sources of genetic parthenocarpy described in tomato,
pat phenotype by investigating the expression of parthenocarpy in three
parthenocarpy was high in the three experimental environments and was
dev.biologists.org /cgi/content/abstract/125/1/107   (456 words)

 Fruit development is actively restricted in the absence of fertilization in Arabidopsis -- Vivian-Smith et al. 128 ...
Parthenocarpy is influenced by flower position and inter-organ communication in fwf
Parthenocarpy in gai-1 fwf mutants occurs by cell expansion as anticlinal mesocarp cell division is abolished
Parthenocarpy is recessive in fwf plants suggesting that fwf
dev.biologists.org /cgi/content/full/128/12/2321   (6538 words)

 ARS | Publication request: Generation Means Analysis of Parthenocarpic Characters in a Processing Cucumber (Cucumis ...   (Site not responding. Last check: 2007-10-22)
Technical Abstract: The incorporation of genes for parthenocarpy (the production of fruit without fertilization) into processing cucumber (Cucumis sativus L.) can provide a means for increasing fruit yield and quality.
Thus, the inheritance of parthenocarpy was investigated in segregating generations derived from a line 2A (P1, parthenocarpic) x Gy8 (P2, non-parthenocarpic) mating.
These results suggest that selection will likely be effective for increasing the degree of parthenocarpy in the environments tested, however, the amount of gain from selection for this trait will be environmentally dependent.
ars.usda.gov /research/publications/Publications.htm?seq_no_115=164453   (428 words)

Parthenocarpy is an interesting property in apple cultivation as it may allow problems with cross pollination and biennial bearing to be avoided.
Pollination is not required to induce parthenocarpic fruit set in ‘Summerred’.
A detailed study indicated that in this cultivar non-pollination, free self-pollination and artificial self-pollination gave a comparably low parthenocarpy after emasculation.
www.actahort.org /books/484/484_5.htm   (87 words)

 Plant Hybrids #1
The syconium is the structure that you typically associate with an edible fig fruit; however, it is really a flask-shaped structure lined on the inside with numerous unisexual flowers.
Stimulative parthenocarpy involves the insertion of the wasp's ovipositor down the stylar canal into the ovary of short style flowers.
Vegetative parthenocarpy involves the formation of drupelets without any external stimulation, and is responsible for the hollow drupelets inside common figs such as "fl mission," "kadota," and "brown turkey." [Some authors use the term parthenocarpy to describe the ripening of seedless fig syconia on the tree without any pollination or fertilization.]
waynesword.palomar.edu /hybrids1.htm   (6299 words)

 Marijuana Cultivation Discussion Community - Glossary Correction
In the Advanced Grow guides Glossary it defines parthenocarpy as seeds produced with out fertilization.
I feel this is incorrect, here is some info and links to support my opinion.
Parthenocarpic: Term applied to the development of the ovary of a flower into a fruit without fertilization.
www.hempcultivation.com /420/printthread.php?t=70295   (320 words)

 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations   (Site not responding. Last check: 2007-10-22)
Energy Citations Database (ECD) Document #4041826 - Induced parthenocarpy with pollen irradiated with gamma rays
Availability information may be found in the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or via the "Full-text Availability" link.
Induced parthenocarpy with pollen irradiated with gamma rays
www.osti.gov /energycitations/product.biblio.jsp?osti_id=4041826   (94 words)

 Vegetative Parthenocarpy in the Cactus Pear Opuntia ficus-indica (L.) Mill. -- Weiss et al. 72 (6): 521 -- Annals of ...
Vegetative Parthenocarpy in the Cactus Pear Opuntia ficus-indica (L.) Mill.
Department of Life Sciences and The Institutes for Applied Research, Ben-Gurion University of the Negev, Beer-Sheva, Israel
Opuntia ficus-indica, cactus pear, fruit development, parthenocarpy, pollen-tube-growth, fluorescence microscopy
aob.oxfordjournals.org /cgi/content/abstract/72/6/521   (329 words)

 Definition of parthenocarpy - Merriam-Webster Online Dictionary
: the production of fruits without fertilization fruit by parthenocarpy and without pollination>
For More Information on "parthenocarpy" go to Britannica.com
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www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=parthenocarpy   (100 words)

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