Identification of heat stress adaptive traits in some bread wheat genotypes in Gezira, Sudan

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Wala M. Abedalla

Abstract

Wheat is one of the most important food crops in the world. However, the productivity of the crop in the Sudan is low mainly due to heat stress. The objective of this study was to investigate the genetic variability of yield and morpho-physiological characters of 45 wheat genotypes and to identify adapted heat stress tolerant genotypes. The experiment was conducted at Gezira Research Station of the Agricultural Research Corporation, Sudan, for two seasons (2015/2016 and 2016/2017). The genotypes were tested using alpha lattice design with two replicates in the first season and three replicates in the second season. Parameters measured were days to heading, canopy temperature, normalized different vegetation index (NDVI), and grain yield. Significant differences were observed among genotypes for days to heading and grain yield in all seasons, and canopy temperature and NDVI in the second season. The highest yield was obtained from genotypes G17 sokoll*2/ TROST (3708 kg/ha), G13 WBLL4//OAX93.24.35/ WBLL1 (3651 kg/ha) and G21CHEN/AE.SQ//2*OPATA/3/FINSI (3475 kg/ha). Grain yield was positively and highly significantly correlated with days to heading, NDVI (0.454***) and negatively significantly correlated with canopy temperature. These results indicated that days to heading, NDVI and low canopy temperature could be used as selection criteria of adapted heat stress tolerant genotypes in future breeding programmes. Genotypes sokoll*2/REOST, WBLL4//OAX93.24.35/WBLL1 and CHEN/AE.SQ// 2*OPATA/3/ FINSI were high yielding and are recommended for use in breeding programmes.
Keywords: Canopy temperature, heat stress, NDVI, Sudan, wheat

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