Parthenocarpy

Seedless watermelon

In botany and horticulture, parthenocarpy (literally meaning virgin fruit) is the natural or artificially induced production of fruit without fertilization of ovules. The fruit is therefore seedless. Stenospermocarpy may also produce apparently seedless fruit, but the seeds are actually aborted while still small. Parthenocarpy (or stenospermocarpy) occasionally occurs as a mutation in nature; if it affects every flower the plant can no longer sexually reproduce but might be able to propagate by apomixis or by vegetative means.

However, parthenocarpy of some fruits on a plant may be of value. Up to 20% of the fruits of wild parsnip are parthenocarpic. The seedless wild parsnip fruit are preferred by certain herbivores, and thus serve as a "decoy defense" against seed predation.^[1] Utah juniper has a similar defense against bird feeding.^[2] The ability to produce seedless fruit when pollination is unsuccessful may be an advantage to a plant because it provides food for the plant's seed dispersers. Without a fruit crop, the seed dispersing animals may starve or migrate.

In some plants, pollination or other stimulation is required for parthenocarpy. This is termed stimulative parthenocarpy. Plants that do not require pollination or other stimulation to produce parthenocarpic fruit have vegetative parthenocarpy. Seedless cucumbers are an example of vegetative parthenocarpy, seedless watermelon is an example of stenospermocarpy.

Plants moved from one area of the world to another may not always be accompanied by their pollinating partner and the lack of pollinators has spurred human cultivation of parthenocarpic varieties. Some parthenocarpic varieties have been developed as genetically modified organisms.^[3]

Commercial importance

Seedlessness is seen as a desirable trait in edible fruit with hard seeds such as pineapple, orange and grapefruit. Parthenocarpy is also desirable in fruit crops that may be difficult to pollinate or fertilize, such as fig, tomato and summer squash. In dioecious species, such as persimmon, parthenocarpy increases fruit production because staminate trees do not need to be planted to provide pollen. Parthenocarpy is undesirable in nut crops, such as pistachio, where the seed is the edible part. Horticulturists have selected and propagated parthenocarpic cultivars of many plants, including fig, cactus pear (Opuntia), breadfruit and eggplant. Some plants, such as pineapple, produce seedless fruits when a single cultivar is grown because they are self-infertile. Some cucumbers produce seedless fruit if pollinators are excluded. Strange as it seems, seedless watermelon plants are grown from seeds. The seeds are produced by crossing a diploid parent with a tetraploid parent to produce triploid seeds.

When sprayed on flowers, any of the plant hormones gibberellin, auxin and cytokinin could stimulate the development of parthenocarpic fruit. This is termed artificial parthenocarpy. Plant hormones are seldom used commercially to produce parthenocarpic fruit. Home gardeners sometimes spray their tomatoes with an auxin to assure fruit production.

Some parthenocarpic cultivars have been developed as genetically modified organisms.^[4]

Some parthenocarpic cultivars are of ancient origin. The oldest known cultivated plant is a parthenocarpic fig first grown at least 11,200 years ago.^[5]

In some climates, normally seeded pear cultivars will produce mainly seedless fruit due to lack of pollination.^[6]

Misconceptions

• Most commercial seedless grape cultivars, such as 'Thompson Seedless', are not seedless because of parthenocarpy, but because of stenospermocarpy.^[7]
• Parthenocarpy is sometimes claimed to be the equivalent of parthenogenesis in animals.^[8] That is incorrect because parthenogenesis is a method of asexual reproduction, with embryo formation without fertilization, and parthenocarpy involves fruit formation without seed formation. The plant equivalent of parthenogenesis is apomixis.

References

1. Zangerl AR, Nitao JK, Berenbaum MR (1991). "Parthenocarpic fruits in wild parsnip: decoy defence against a specialist herbivore". Evolutionary Ecology 5 (2): 136–45. doi:10.1007/BF02270830.
2. Fuentes M, Schupp EW (1998). "Empty seeds reduce seed predation by birds in Juniperus osteosperma" (PDF). Evolutionary Ecology 12 (7): 823–7. doi:10.1023/A:1006594532392. Archived from the original on 2006-11-10.
3. Acciarri, N.; Restaino, F.; Vitelli, G.; Perrone, D.; Zottini, M.; Pandolfini, T.; Spena, A.; Rotino, G. (2002). "Genetically modified parthenocarpic eggplants: Improved fruit productivity under both greenhouse and open field cultivation". BMC Biotechnology 2: 4. doi:10.1186/1472-6750-2-4. PMC 101493. PMID 11934354.
4. Pandolfini T, Rotino GL, Camerini S, Defez R, Spena A (2002). "Optimisation of transgene action at the post-transcriptional level: high quality parthenocarpic fruits in industrial tomatoes". BMC Biotechnol. 2: 1. doi:10.1186/1472-6750-2-1. PMC 65046. PMID 11818033.
5. Kislev ME, Hartmann A, Bar-Yosef O (June 2006). "Early domesticated fig in the Jordan Valley". Science 312 (5778): 1372–4. doi:10.1126/science.1125910. PMID 16741119.
6. R.L. Stebbins, W.M. Mellenthin, and P.B. Lombard (1981) Pollination & Commercial Varieties of Pears in Oregon Oregon State University Extension Service.
7. Mullins, M., Bouquet, A., Edward, L. (1992). Biology of the grapevine. Cambridge University Press, p. 75.
8. "parthenogenesis. The Columbia Encyclopedia, Sixth Edition. 2001-07". bartleby.com. Archived from the original on 28 June 2008.

External links

• Weiss, J., Nerd, A. and Mizrahi, Y (1993). "Vegetative parthenocarpy in the cactus pear Opuntia ficus-indica (L.) Mill". Annals of Botany 72 (6): 521–6. doi:10.1006/anbo.1993.1140.