Root response of rice (Oryza sativa L.) under deficient nitrogen condition using BC sub 1 F sub 4 recombinant inbred lines derived from US-2 and MALAY-2 crosses
2018
Manangkil, J.M. | Mallari, R.P. | Banting, M. | Estrada, S. | Castillo, M.P. | Mananghaya, I.E. | Niones, J.M.
Nitrogen (N) is one of the most important nutrients in the rice plant and limited N supply can affect plant growth and development. Plant roots are important organs that supports the plant body and responsible for uptake of water and nutrients in the soil. Agronomic performance can be increased by improving the root system architecture. Thus, this study was conducted to evaluate the response of rice root in two nitrogen concentrations by determining the seminal root length, root biomass and the number of nodal roots. A total of 168 BC1F4 recombinant inbred lines (RIL) derived from US-2 and MALAY-2 crosses were grown in hydroponic condition with deficient (5um) and sufficient (500um) NH sub 4+ supply for eight days. Seminal root length under US-2 was 28 mm longer than MALAY-2 and RILs under different nitrogen concentrations. An increase in seminal root length, root biomass and the number of nodal roots of the two parent lines and RILs were observed under deficient nitrogen condition compared to sufficient condition. Mean value of RIL in three root traits were comparable with US-2 in both nitrogen concentration. These results showed high genetic variation in root development in the mapping population and parentals in responses on the two nitrogen concentration.
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