Root development of F1rice hybrid and parents as affected by nitrogen concentration of culture solution
Year: 1994
Type: article
Abstract: Nitrogen (N) nutrition is the major factor involved in attaining high yield in rice (Oryza sativa L.). This study was conducted to elucidate the relationship between the ammonium-N concentration of the culture solution and the root system development of F1 rice hybrid and parents. The rice plants were grown in culture solutions at 0.2, 2, and 20 mg L-1 of N for 30 d. Two and 20 mg L-1 N of culture solutions suppressed the elongation of both nodal root axes and lateral roots, whereas 20 mg L-1 N promoted the proliferation of the lateral roots. As a result, total root length was greatest in the 0.2 mg L-1 N-fed plants. On the contrary, the dry matter partitioned to the root systems of the 0.2 mg L-1 N-fed plants was the same as or smaller than that of the 2 and 20 mg L-1 N-fed plants. The ratio of total length to dry weight of the root system (specific root length) showed a trend similar to the total root length. The trend of root system development was similar in both F1 hybrid and parents. Moreover, we observed that for the F1 hybrid, the total root length and the specific root length of the 20 mg L-1 N-fed plants were almost the same as those of the 0.2 mg L-1 N-fed plants. These results suggest that the root system of the F1 rice hybrid and parents grown in 0.2 mg L-1 N and that of the F1 rice hybrid grown in 20 mg L-1 N are highly efficient in converting the dry matter into root length increment.
Source: Soil Science & Plant Nutrition
Authors: Hiroshi Hasegawa, Tadao Kon, Yasuhiro Kono
Institution: Nagoya University
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2041940995