Evaluation of Some Bitter Vetch Ecotypes in Terminal Heat Stress Tolerance in Farm Condition

Articles in Press

Document Type : Research Paper

Authors

1 Department of Genetics and Plant Production, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran

2 Associate Professor, Department of Genetics and Plant Production, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran

Abstract

In order to evaluate effect of heat stress at the end of the season on grain yield and some related traits of bitter vetch ecotypes, an experiment in the Farm of Vali-e-Asr University of Rafsanjan in 2023-2024 cropping seasons with a randomized complete block design with three repeat on 12 ecotypes was conducted. Number of days to emergence, flowering end and 50% maturing stage, plant height and root length in maturity stage, above ground biomass, grain yield, thousand kernel weight and harvest index were measured. Ecotypes were planted in three sowing dates (26Dec.2023, 25Jan.2024 and 24Feb.2024). Combined analysis of variance showed sowing date effect on number of days to emergence and number of days to 50% maturing stage, ecotype effect on plant height, interaction effect of sowing date×ecotype on above ground biomass and thousand kernel weight and sowing date effect, ecotype effect and their interaction effect on number of days to flowering end, grain yield and harvest index had significant effect. Response of ecotypes to sowing dates was different, which indicated the existence of diversity between ecotypes in terms of the traits. According to cluster analysis, ecotypes were divided into 3 groups in each three sowing dates. According to means comparison of the groups obtained from cluster analysis, Yolwlqonlu in the second and third sowing dates (with grain yields of 6.0 and 3.9 g/plant and harvest index of 35.7 and 27.6 % respectively) were identified as the most tolerant ecotype to terminal heat stress for grain yield production in Rafsanjan.

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Main Subjects

Iranian Journal of Field Crop Science

Articles in Press, Accepted Manuscript
Available Online from 04 June 2026

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History

  • Receive Date: 11 June 2025
  • Revise Date: 19 December 2025
  • Accept Date: 24 December 2025
  • Publish Date: 04 June 2026

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