Document Type : Research Paper

Authors

1 PhD Student,-Department of Plant Production and Genetics- College of Agriculture- Agricultural Sciences and Natural Resources University of Khuzestan-Ahvaz-Iran

2 Professor-Department of Plant Production and Genetics-College of Agriculture-Agricultural Sciences and Natural Resources University of Khuzestan-Ahvaz-Iran

3 Associate Professor-Department of Plant Production and Genetics- College of Agriculture-Agricultural and Natural Resources Sciences University of Khuzestan-Ahvaz-Iran

4 Professor-Department of Plant Production and Genetics-College OF Agriculture-Agricultural Sciences and Natural Resources University of Khuzestan- Ahvaz-Iran

5 Assistant Professor-Department of Plant Production and Genetics- Colleg of Agriculture-Khuzestan University Agricultural Sciences and Natural Resources-Ahvaz-Iran

Abstract

In order to determine drought stress In the final stages of flowering up to 50% pods and pods until harvest tolerance in canola genotypes using yield-base stress tolerance indices, a split plot experiment was conducted based on the randomized complete block design with three replications at the research farm of department of plant production and genetics, Agricultural Sciences and Natural Resources University of Khuzestan, Iran during 2020-2021. Main plots included three irrigation treatment: control (without interruption of irrigation), interruption of irrigation in the beginning of flowering stage (phenology code 60) to the formation of 50% pods (phenology code 75) and interruption of irrigation in the stage of formation of pods until harvest (Phenology code 99) in the main plots and The genotypes (Long pod, Aram, RGS 003, Jankom, Solar, Hayola 4815, Mahtab, Julius, Agamax and Sala) were arranged in sub-plots with respect to irrigation treatments. They were reliable indices to identify drought tolerant rapeseed cultivars. Indices MP, GMP, STI were the most suitable indices to evaluate drought stress tolerance in different treatments. The highest grain yield of control treatment was from Hayola 4815, Long pod, Solar genotypes (2093.8, 1791 and 1700 kg / ha), The lowest from Jankum genotype (832.1 kg / ha), in flowering Stress up to 50% pods. The highest grain yield was Hayola 4815 (1563.9 kg / ha) and Lon gpod (1150.9 kg / ha) and the lowest grain yield was Jankum and Mahtab genotype (540, 935.5 kg / ha).

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