New two-line hybrid rice TH7-5

In recent years, the new rice two-line hybrids developed in Vietnam have been growing widely in Summer as well as in late Spring seasons, because of the high yield, good quality and short growth duration. The Hybrid rice Technology Division has continuosly improved parental lines for better quality, plant type and lodging resistance.. TH7-5 (T7S/R5) is a new two-line hybrid rice variety with short growth duration (107-110 days in Summer crop and 120-125 days in Sping crop). TH7-5 has intensive plantype, thick and stirl culm, good lodging resistance with long errect and dark green flag leaf color, big panicle and high grain number and high yield (5-7,5 tons/ha), good grain quality, blast resistance, moderate pest resistance(slightly susceptible to blast and bacterial leaf blight). TH7-5 is suitable to the late Spring and early Summer crop in the northern provinces of Vietnam. T7S is a TGMS line, that has been selected from the combination T1S-96/Huong125S, with intesive plant-type, high out-crossing rate and moderately sensitive to GA3. The restorer line R5 is an aromatic line selected from the combination R3/Huong com. The hybrid seed production protocol has been establised and used for seed production trial with the yield 1.83-2.68 tons per hectare.