From Lab to Land - Overcoming Challenges in Adoptation of Speed Breeding Technology

Plant breeding is considered one of the prospective strategies for the BPH [Nilaparvata lugens (Stål.)] resistance development under the modernized rice production system. The BPH-resistant novel rice lines were studied via molecular SSR markers, and the BPH effects on grain yield and the agronomic performance of the rice were also reported. The seven rice lines were obtained from the parents OM6683 (donor) x OM6162 (recipient), and two TN1-susceptible and Ptb33-resistant checking cultivars were used through the standard seed box screening technique. The results showed that seven rice lines and the OM6683 variety almost contained the BPH-resistance genes Bph1, Bph3, and Bph13 by utilizing three simple sequence repeat markers, like RM1103 (200 bp), RM204 (200 bp), and RM545 (220 bp). In addition, all of these rice lines/varieties also uncovered the BPH-resistance characteristics from resistant (3, scale) to highly resistant (1, scale) for four diverse BPH populations (Can Tho, Dong Thap, Tien Giang, and Hau Giang provinces) in both Autumn-Summer and Spring-Winter seasons. Furthermore, the results of BPH-resistance characteristics, grain yield, and agronomic traits were better than in the five rice lines G1-BC2F5-7-1-1-5-10, G2-BC2F5-8-1-1-9-5, G3-BC2F5-11-1-1-8-7, G4-BC2F5-54-1-1-5-2, and G5-BC3F4-8-1-1-1-5 as compared to other rice lines and the parents OM6162 and OM6683. In conclusion, the studies suggested that these potential rice lines can be harnessed as donor pivotal genetic sources to develop BPH-resistant novel rice varieties combined with valid agronomic and quality traits, and high crop yield.