Abstract
Abstract Often overlooked is the importance of early-maturing rice varieties with their ability to escape droughts, avoid floods, and in some localities, open up the opportunity for double cropping. Most varieties grown in the tropics until the last half century matured in 150 to 180 days or longer and were photoperiod sensitive. However, non-photoperiod sensitive one-hundred-day varieties were grown in the Champa Kingdom in what is now Central Vietnam centuries ago. How these varieties moved into Song Dynasty China and the impact of the early-ripening rice on population growth in South China is well documented. However, the origin of the Champa varieties is less clear. According to a recent DNA test (see below), the Champa varieties belong to the aus sub-population. The aus have the characteristics of both indica and japonica and originated in the hill areas of what are now Eastern India, Bangladesh, and Myanmar. Because the Champa Kingdom adopted the Indian language and religion, at least in the higher courts, it seems logical that the Champa rice must have been disseminated from the hilly areas in the Indian sub-continent to Central Vietnam and eventually to China—first Fujian and later to the Yangtze region during the Song Dynasty in the eleventh century.
Highlights
The origin and spread of Champa rice took place centuries ago when rice varieties were typically selected and developed by farmers for their suitability to a particular environmental situation
Advances in varietal improvement have through time carried a doubleedged sword—facilitating food security and alleviating poverty in the short run, but inadvertently serving as a catalyst for further human population growth
The emperor Zhenzong (992–1022) came to know that Champa rice was drought resistant, early maturing, and non-photoperiod sensitive (Sharma 2010)
Summary
The origin and spread of Champa rice took place centuries ago when rice varieties were typically selected and developed by farmers for their suitability to a particular environmental situation. The emperor Zhenzong (992–1022) came to know that Champa rice was drought resistant, early maturing, and non-photoperiod sensitive (Sharma 2010) (that is to say, its ripening was not determined by the day length or period of sunlight).
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