Mar 13, 2017

Breeding & Genetic improvement Breeding-Asia
Abstract                                                                         Back to Table of contents

A major breakthrough in cotton spinning technology was achieved about three decades ago when the open-end (OE) spinning system was developed. Among the different versions developed such as Rotor, Friction and Air-jet, the first one has gained most popularity and is widely adopted all over the world. Compared with the conventional ring spinning, the rate of yarn production in OE system is about five times higher and is more economical. Further, the yarn evenness of OE yarn is superior to ring yarn. However, the tenacity of OE yarn is weaker by about 15-20% as compared with that of ring yarn for the same count. To overcome this deficiency, spinners are demanding cottons with high fibre strength which has become the most important fibre quality parameter for OE spinning.

Accordingly, breeders have initiated research programmes for evolving cotton varieties that have high fibre strength. Recently, in India,  a few lines of Pusa 2 (G. hirsutum) have been bred which possess fibre bundle tenacity as high as 53 - 56 g/tex at zero gauge and 33 - 36 g/tex at 1/8 in. gauge and with suitable combination of other fibre properties. In OE spinning tests, two lines of Pusa 2 performed excellently, recording CSP values as high as 2800 and 2460 at 20s and 30s counts (Ne).  Analysis of physical, morphological and geometric features of fibres and their cross-sections has revealed that homogeneity in all these characters is essential for a fibre to be strong. This paper discusses details of the developments and it is shown that the challenging demands of modern spinning technologies can be met effectively.

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