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Scientists perform sex change operation on papaya

Researchers help frustrated farmers by simplifying the complex sex life of this succulent fruit.
By Bryan Nelson
Tue, Nov 03 2009 at 8:20 PM EST
Read more: ENVIRONMENTAL SCIENCE, FARMING & AGRICULTURE, FOOD, GENETICALLY MODIFIED FOODS (GM)

Photo: grendelkhan/Flickr
 
Papayas already come in three sexual varieties: male, female and hermaphrodite, but it is only the hermaphrodite varieties that produce the succulent fruit that is sold commercially. The problem for farmers is that seeds from hermaphrodite varieties don't always produce more hermaphrodites, and it is impossible to tell the sex of a seed until it has grown up and flowered.
 
To cope, farmers currently plant four or five seeds together to improve the odds that a particular plot will sprout at least one hermaphrodite. Once they grow old enough to identify, farmers cut down the undesired plants and leave only the fruit-bearing bush.
 
As a result, production costs are high and farmers use more water and fertilizer than would be necessary if they only had to grow hermaphrodite papayas. Furthermore, the plants tend to develop poor root systems and a small canopy due to the crowding, which delays fruit production.
 
But with the help of modern science and genetics, Ming and his colleagues have come up with a crafty solution: modify the sex chromosomes of the papaya so that seeds produced by hermaphrodite plants only spawn other hermaphrodites.
 
Although there are ecological concerns associated with genetically modified plants, there are also environmental trade-offs which would be beneficial for farmers and the local ecosystem. Less water and fertilizer would be needed, which would reduce contamination from agricultural runoff, prevent overuse of local water tables and lessen the labor and costs placed on growers.
 
"This is a perfect case to demonstrate how basic science can help the farmers directly," said Ming.


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Comments(4)

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Posted By Jenny - Wed, Nov 18 2009 at 1:44 AM EST

Woah

I never knew that fruits had genders!! Now I'm scared to eat them. Seriousley, why do people write articles like these?

Posted By Thomas - Sat, Nov 14 2009 at 2:14 AM EST

Hermy does not equal tranny

"I will eat a homosexual papaya, but I draw the line at transgendered fruit..."

I know you're trying to be funny, but that doesn't even make sense. It does not related to this article.

Transgendered means it displays the opposite of the sex it is; cisgendered means it displays the same sex it is - cis = same.

A hermaphrodite is both sexes, like a worm. That is, it produces sperm and egg, and could self-fertilise (although biologically this is not favoured).

Posted By wheelrunner - Fri, Nov 06 2009 at 10:18 AM EST

Strings?

So, are they doing this for the environment, or are they going to exercise a stranglehold on the seeds and strangle the profits out of farmer the way Monsato does with it's seeds. Be very careful, sometimes advances in science can mean degradation in life for some.

Posted By Ryan S. - Fri, Nov 06 2009 at 12:49 AM EST

Sha-mon

I will eat a homosexual papaya, but I draw the line at transgendered fruit...

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