A major problem in hybrid rice production is the occurrence of leaf senescence during the grain filling stage that can result in reduction of yield. Changes in
Roll-leaf-1 (rl-1) and spot-leaf-1 (spl-1) were two near-isogenic lines, which were obtained after 3 to 4 backcrosses withearly season indica rice Zhefu 802 as
Methamidophos resistance of brown planthopper(BPH), Nilaparvata lugens was selected in laboratory for 19 generations (F1 to F19). The resistance development in