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Wheat Information Service
Number 76: 20-22 (1993)


Transfer of yellow rust resistance to Unnath Kalyan Sona

V. R. K. Reddy1, R. N. Brahma and R. Asir2.

1Cytogenetics Laboratory, Department of Botany, Bharathiar University, Coimbatore - 641 046,India.
2Directorate of Wheat Research, Regional Station, Wellington, The Nilgiris, India.


Summary

A yellow rust resistant gene was transferred from three Indian wheat cultivars BW 1052, BW 1109, HUWL 9032 into a hexaploid wheat cultivar Unnath Kalyan Sona after fifth backcrossing. The concurrent restoration of stem rust resistance in Unnath Kalyan Sona was attributed to the transfer of an undesignated stem rust resistance gene from the donor parents to the recipient parent. This gene was suggested to be linked with the undesignated Yr gene which was transferred.


Introduction

Unnath Kalyan Sona, an improved variety of Kalyan Sona developed by Kochumadhavan et al (1988), was resistant to stem and leaf rusts under the conditions of Wellington in South India. This variety possesses Sr24 + Lr24, a linked gene complex derived from an Australian wheat cultivar TR 380-14* 7/3 Ag 14. However, this variety was found susceptible to stem rust early in the 1990's at Wellington. The variety was also found highly susceptible to yellow rust. Therefore, to the background of this wheat cultivar, an attempt was made to transfer an undesignated yellow rust resistant gene from three hexaploid Indian wheat cultivars.


Materials and methods

Crosses between Unnath Kalyan Sona and three Indian wheat cultivars, namely, BW 1052, BW 1109 and HUWL 9032, which carry the undesignated yellow rust resistant genes, were made at Regional Station, The Directorate of Wheat research, Wellington, The Nilgiris, South India. The place is a 'hot spot' of wheat diseases, where all the three rusts are prevalent throughout the year under natural conditions. The resistant hybrids were successively backcrossed to recurent parent five times.

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