Received: Oct 19, 2018 / Accepted: Oct 22, 2018 / Published: Oct 22, 2018
The overuse of fertilizers can result in many adverse effects such as decreasing fertilizer use efficiency of plants, wasting resources, increasing farming costs, and polluting our environment. Local rice landraces including indigenous and local rice varieties, may contain considerable genetic diversity that can serve as sources of germplasm for genetic improvements of nutrient use efficiency, yield, resistance to pests and pathogens, and important agronomic traits. Increasing the fertilizer use efficiency of crops by developing new rice varieties is necessary for sustainable agriculture. In this study, six rice varieties, Chiem Tay (CT), Te Tep (TT), Re Bac Ninh (RB), IR24, P6DB, and Khang Dan 18 (KD18), were evaluated for nitrogen use efficiency. Two landraces, P6DB and CT, which showed the lowest and highest values of nitrogen use efficiencies, were selected for a genome survey. Ninety-seven out of the 1051 surveyed markers indicated polymorphisms. These polymorphic markers were distributed along to each of the 12 chromosomes and were either scattered quite evenly on a chromosome or were condensed at particular regions in the physical map. The obtained information on nitrogen use efficiency (NUE) variation and the marker map should be very useful to further identify QTLs/genes involving in NUE as well as other genetic analyses toward the development of sustainable agriculture.
