Studies on root traits for drought tolerance in rice (Oryza sative L.) under controlled (PVC pipes) condition

Electronic Journal of Plant Breeding

关键词: rice;    root traits;    drought tolerance;    PVC pipes;   

DOI  :  

来源: DOAJ

【 摘 要 】

Rice (Oryza sativa L.) is the most important food crop of the world; but drought stress is a serious limiting factor to riceproduction and yield stability in rainfed areas. In order to design an efficient breeding program for synthesis of new varietieswith virtues of drought tolerance and high yielding ability, it is necessary to identify potential parents that combine well forboth yield and drought tolerance. Hence, the present investigation was undertaken to evaluate genetic potentiality of eight linesand five testers along with 40 hybrids were evaluated under PVC pipes (controlled) Condition for root traits in order to usethem in drought resistance breeding programmes. The parents and hybrids were raised in PVC pipes, where the plants weresubjected to drought for a period of 20 days during tillering stage starting on 60 days after sowing. Observations were recordedon seven important root traits viz., root length, root volume, root length density, total number of roots, root thickness, root dryweight and root:shoot ratio. Five genotypes viz., Norungan, CT 9993, Moroberekan, Nootripathu and MDU 5 showedsignificantly superior mean values than grand mean for most of the root traits included in the study. Therefore, these genotypescan be used as potential donors in drought resistance breeding programme. Among the hybrids, CT 9993 / ASD 18,Moroberekan / ASD 16, CT 9993 / IR 50, Moroberekan / Co 47, Noungan / ASD 16, Nootripathu / MDU and Nootripathu / CO47 were identified as outstanding ones for improving drought tolerance as they registered significant higher mean value formajority of the root traits.

【 授权许可】

Unknown