Okra: Breeding and Genomics

Abstract

Okra is an important vegetable crop cultivated throughout the tropical and subtropical parts of the world and in the warmer regions of the temperate zones. Its commercial cultivation is distributed exclusively across the various developing countries in Asia and Africa. The commonly cultivated okra is reported to a tetraploid species and has a very large and complex genome which hampers its speedy genetic improvement utilizing modern omics technology. Breeding methodologies suitable for self-pollinated crops have been often utilized for the genetic improvement of okra such as plant introduction, pure line selection, hybridization followed by selection, mutation breeding and heterosis breeding. Pedigree selection and heterosis breeding has been used by okra breeders which resulted in the development of lots of varieties and hybrids in India. In modern-day okra breeding along with high yield potential, multiple tolerance to YVMV, OELCV, sucking pest and borer, easy to harvest, dark green fruit color and ideal plant type are the major target traits. During the last few decades, different public sector institutions has developed and released as many as 33 improved varieties/hybrids for the benefit of the farming community across the country. Few of these varieties/hybrids have already made a noteworthy impact in okra production in India. This article reviewed the current status of okra breeding including genetic resources, cytogenetic relationship, breeding objectives, varietal development, resistance breeding, biotechnological intervention and its future improvement strategies.