Effect of GA3 and other chemicals for increased seed yield of cms lines in rice

Abstract

The WA cytoplasm which leads to CMS in rice poses problem of poor panicle exertion. Hence foliar application of gibberellic acid (GA₃) at the start of panicle emergence has been widely adopted as an essential technique for enhancing panicle exertion in China and has been recognized as an integral component of hybrid rice seed production. An experiment was conducted to study the effect of GA₃ and other chemicals to economize the dose of GA₃ for higher grain yield in CMS lines in rice. The highest seed yield of CMS lines can be obtained with the application of GA₃ 30 g / ha + Nutragold. The same treatment also recorded the highest productive tillers per plant, panicle length, panicle exertion per cent and seed setting per cent. Application of GA₃ alone or in combination with boric acid, KH2PO4, Nutragold and Nutragold alone improves the expression of floral characters promoting better seed set on CMS parent.