Citrus indica Tanaka - a progenitor species of cultivated Citrus

Nov 10, 2011

A group of enthusiastic cytogeneticists (Marlykynti Hynniewta, Surendra Kumar Malik and Satyawada Rama Rao) from North Eastern Hill University show that C. indica occupies a special taxonomic position, as reflected in the karyomorphological data.

The genus Citrus is an economically important horticultural crop known for its fruit and juice. In India, there are about 30 species of Citrus of which at least nine species are available throughout India, while 17 species are confined to the North-Eastern states of India, which have been classified as a hot spot for Citrus biodiversity and are threatened in their as per the criteria fixed by the International Union for and Natural Resources (IUCN). Seven Indian Citrus species are considered endangered or nearly so, including C. Indica, C. macroptera, C. latipes, C. assamensis, C. ichangensis, C. megaloxycarpa and C. rugulosa.

C. indica (Tanaka, 1937) is supposed to be the most and perhaps the progenitor of cultivated Citrus. From the karyomorphological data it can be observed that the index of different species of Citrus presently investigated had shown significant variation. C. medica, C. grandis and C. reticulata which are considered as true basic species are characteristic in having low asymmetry index of 1.87, 1.89 and 2.46 respectively. In the present investigation, the data from the karyomorphological observations on chromosome complements in 10 different Citrus species reflect that C. indica with its intermediate asymmetry index value (1.94) may be regarded as a true of cultivated Citrus. This study also supports the previous report that there are three true species of Citrus, viz. C. grandis, C. reticulata and C. medica.

Explore further: Dwindling wind may tip predator-prey balance

More information: Hynniewta M, Malik SK, Rao SR (2011) Karyological studies in ten species of Citrus (Linnaeus, 1753) (Rutaceae) of North-East India. Comparative Cytogenetics 5(4): 19. doi: 10.3897/CompCytogen.v5i4.1796

add to favorites email to friend print save as pdf

Related Stories

Genetic origin of cultivated citrus determined

Jan 18, 2011

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 ...

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 ...

Yellowdragon threatens Florida citrus

Oct 15, 2005

Yellow dragon disease, which is also called citrus greening, has been found in southeast Florida and appears to be spreading, agricultural authorities say.

Test Detects Insect Carriers of Citrus Greening Disease

Oct 26, 2009

(PhysOrg.com) -- With their pleasing flavor, cheerful color, and health-imparting dose of vitamin C, it's not surprising that oranges are one of America's Top 10 favorite fruits. But some of the nation's citrus ...

Recommended for you

Dwindling wind may tip predator-prey balance

Sep 19, 2014

Bent and tossed by the wind, a field of soybean plants presents a challenge for an Asian lady beetle on the hunt for aphids. But what if the air—and the soybeans—were still?

Asian stars enlisted to fight African rhino poaching

Sep 19, 2014

Increasingly desperate South African conversationists are turning to a multi-national team of "rhino ambassadors" to try to end the scourge of poaching—and Vietnamese pop diva Hong Nhung has been recruited ...

Tropical fish a threat to Mediterranean Sea ecosystems

Sep 18, 2014

The tropical rabbitfish which have devastated algal forests in the eastern Mediterranean Sea pose a major threat to the entire Mediterranean basin if their distribution continues to expand as the climate ...

User comments : 0