Genetic origin of cultivated citrus determined

Jan 18, 2011
Researchers in China have discovered the genetic origins of citrus, including bergamot (pictured). Credit: Photo by Xiaomeng Li

Citrus species are among the most important fruit trees in the world. Citrus has a long history of cultivation, often thought to be more than 4,000 years. Until now, however, the exact genetic origins of cultivated citrus such as sweet orange (Citrus sinensis), lemon (C. limon), and grapefruit (C. paradisi) have been a mystery. A team of researchers from China has published a study in the Journal of the American Society of Horticultural Science that provides genetic evidence of the origins of a variety species of today's cultivated citrus.

The research team, led by Zhiqin Zhou from Southwest University, analyzed amplified fragment length polymorphism (AFLP) fingerprints—a technique that has been used successfully to assess the origin of potato cultivars—with chloroplast DNA (cpDNA) sequence analysis and nuclear internal transcribed spacer. "The combination of nuclear DNA and cpDNA data allowed us to identify the exact genetic origin of the cultivated citrus", they wrote.

The results proved that bergamot and lemon were derived from citron and sour orange, and was a hybrid that originated from a cross between pummelo and sweet orange. The data demonstrated that sweet orange and sour orange were hybrids of mandarin and pummelo, while rough lemon was a cross between citron and mandarin. The evidence also confirmed that bergamot was a hybrid of sour orange and citron, with sour orange as the maternal parent and citron as the paternal parent.

"Our molecular evidence presented more convincing data than all other previous studies in supporting the origin of lime", noted the scientists. The data confirmed a species of Papeda to be the female parent and C. medica as the male for mexican lime.

The researchers said that a clear understanding of the citrus genetic background is necessary for better characterization and utilization of citrus germplasm, adding that this research will provide important new information for future study on the genetics and breeding of citrus.

Explore further: Study shows sharks have personalities

More information: The complete study and abstract are available on the ASHS Journal of the American Society for Horticultural Science electronic journal web site: journal.ashspublications.org/c… t/abstract/135/4/341

Provided by American Society for Horticultural Science

5 /5 (5 votes)
add to favorites email to friend print save as pdf

Related Stories

New Method Tests Severity of Key Citrus Virus

Dec 28, 2009

(PhysOrg.com) -- A new rapid way to test severity of the devastating citrus tristeza virus (CTV) in citrus trees has been developed by Agricultural Research Service (ARS) scientists in Parlier, Calif. The ...

Scientists claim citrus originated in Australasia

Oct 01, 2007

Scientists at the Centre for Plant and Food Science at the University of Western Sydney have questioned the long-established perception that citrus originated in Southeast Asia. They believe it may have originated closer ...

Recommended for you

Study shows sharks have personalities

10 hours ago

Some sharks are 'gregarious' and have strong social connections, whilst others are more solitary and prefer to remain inconspicuous, according to a new study which is the first to show that the notorious ...

Genetic secrets of the monarch butterfly revealed

16 hours ago

The monarch butterfly is one of the most iconic insects in the world, best known for its distinct orange and black wings and a spectacular annual mass migration across North America. However, little has been ...

User comments : 0