The presence of excess salt is one of the most widespread soil toxicity problems in many rice growing areas. In particular, it accounts for 8.5 million hectares of land in India and the yield reduction is estimated at 30-50%.
The success of any breeding programme is dependent on the available genetic divergence in the crop. Dr. A. Anandan and colleagues measured genetic diversity in forty-four salt tolerant rice types from different geographical regions. They analysed the genetic relationships among extant genotypes in order to provide information about genetic diversity. They divided the seeds into 12 clusters. The results suggest that geographical distribution is not necessarily related to genetic divergence, with several diverse regions appearing in the same clusters. They also found that genotypes from the same geographic region appeared in different clusters, and may be due to genetic heterogeneity – i.e. different genes producing identical phenotypes.
They identify promising genotypes for future use in breeding to develop saline tolerant genotypes and estimate the relationship between measurable traits associated with yield under a saline environment.
Pertanika Journal of Tropical Agricultural Science (JTAS)
