Rayada specialty: the forgotten resource of elite features of riceReport as inadecuate

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, 6:41

First Online: 21 December 2013Received: 22 August 2013Accepted: 17 December 2013


Crop domestication and thereafter gradual selection or directional breeding have narrowed the genetic diversity of elite varieties and even promoted gathering of deleterious mutations in their stress response mechanisms, whereas local ecotypes, landraces and wild relatives still growing on native environment and preferences keep the genetic diversities for features like stress tolerance. Rayada is such an exceptional ecotype, variant of typical deepwater rice, completely endemic to certain areas of Madhumati river tracts of Bangladesh and still shares some features of wild rices. Multiple physiological features of Rayadas are distinctly different from typical deepwater rice. Tolerance to prolonged flood, submergence and cold are special features along with strong photoperiod sensitivity and lack of dormancy. Moreover, longer root system and prompt recovery capacity make it as an elite resource of stress tolerance. However, it has long been neglected because of mainly its long life cycle and poor yield. This review examines the specialty of Rayada rice and the potential use of its unique traits.

KeywordsRayada rice Deepwater rice Stress tolerance Rice genetics Rice breeding AbbreviationsDWRDeepwater rice

IRRIInternational rice research institute

BRRIBangladesh rice research institute

EUIElongated uppermost internode

ERFEthylene response factor

SNPSingle nucleotide polymorphism

RLDRoot length density

BVPBasic vegetative phase

PSPPhotoperiod sensitive phase

GWASGenome-wide association study

QTLQuantitative trait loci.

Electronic supplementary materialThe online version of this article doi:10.1186-1939-8433-6-41 contains supplementary material, which is available to authorized users.

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Author: ANM Rubaiyath Bin Rahman - Jianhua Zhang

Source: https://link.springer.com/

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