The results showed that the growth durations of the lines varied depending on the growing areas. In each region, the growth durations of the IAS lines were shorter than that of IR24 variety, but only DCG66 had a short growth duration. The plant heights of the lines were equivalent to that of IR24, except for DCG66 which had significantly taller plants. The flag leaf lengths of the lines in the Summer were longer than in the Spring, but the flag leaf widths did not differ between seasons. Grain yields of the lines in the Spring season were higher than in the Summer season. | Tạp chí Khoa học Nông nghiệp Việt Nam 2018, 16(8): 719-729 Vietnam J. Agri. Sci. 2018, Vol. 16, No. 8: 719-729 BIO-AGRONOMIC CHARACTERISTICS OF PROMISING RICE LINES DERIVED FROM A CROSS BETWEEN ASOMINORI JAPONICA AND IR24 INDICA AT THREE DIFFERENT LOCATIONS Nguyen Hong Hanh1*, Nguyen Van Hoan2, Pham Van Cuong1,2 1 Facuty of Agronomy, Vietnam National University of Agriculture, Hanoi 131000, Vietnam 2 Center of International Plant Research Vietnam and Japan, Hanoi 131000, Vietnam * Corresponding author: nhhanh@ Received: Accepted: ABSTRACT Field experiments were conducted to evaluate the adaptability of four promising rice lines, viz. IAS5, IAS37, IAS63, and DCG66, in both the Spring and Summer seasons of 2017 in Son La, Hanoi and Nghe An. The results showed that the growth durations of the lines varied depending on the growing areas. In each region, the growth durations of the IAS lines were shorter than that of IR24 variety, but only DCG66 had a short growth duration. The plant heights of the lines were equivalent to that of IR24, except for DCG66 which had significantly taller plants. The flag leaf lengths of the lines in the Summer were longer than in the Spring, but the flag leaf widths did not differ between seasons. Grain yields of the lines in the Spring season were higher than in the Summer season. The average grain yields of the IAS lines were not significantly different compared to those of IR24 across locations, but the grain yield of DCG66 was and higher than that of IR24 across three locations in Spring and Summer season, respectively. There were significant differences in the grain size of the studied lines, and among those only IAS63 was classified as having a long grain size. The amylose contents of the lines were around , and thus the lines were classified as belonging to the hard rice group. Overall, the results showed that all the lines were able to adapt .
