Iranian Journal of Field Crop Science

Iranian Journal of Field Crop Science

The effects of terminal heat stress on pollen and ability of seed setting in barley genotypes (Hordeum vulgare L.)

Document Type : Research Paper

Authors
Akram Oraki 1
Mohammad Reza Siahpoosh 2
Afrasyab Rahnama 3
1 MSc student
2 Faculty member of Shahid Chamran University of Ahvaz
3 Agronomy and Plant Breeding Dep., Collage of Agriculture, Shahid Chamran Uni.
10.22059/ijfcs.2018.234742.654332
Abstract
In this research, the effects of different temperatures treatments including (25 (control), 30, 35, 40 and 50 0C) on pollen germination, pollen tube growth, and pollen morphology were investigated in vitro, and also the effect of late sowing date as heat stress on the number of pollen, also yield and yield components of 10 barley genotype was evaluated in field condition. At 50 0C this decrease was 72 and 60% for germination and length of pollen tube on average. High temperature significantly decreased pollen germination and pollen tube length in all genotypes. Genotypes showed different responses to temperature treatments, indicating different levels of tolerance among genotypes. In vitro, genotypes were divided into three groups according to the TSRI index as tolerant (Jounob, Reyhan 03, Zehak, Nosrat, Khoram), semi-sensitive (Yousef, Izeh, and Mahour) and sensitive (Abidar and Nimrooz) genotypes. Heat stress influenced pollen morphological aberrations, so that high temperature was removed the ornamentation of axin surface. Heat stress led to a decrease in the number of pollen grains per spike (90 %), yield and yield components (40%). These approaches showed that pollen performance may provide useful information to facilitate the investigation of heat-tolerant genotypes in breeding programs suitable for warm climates.

Highlights

REFERENCES

Keywords
Barley
grain yield
heat stress
pollen germination
pollen tube length

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Iranian Journal of Field Crop Science
Volume 50, Issue 4
Winter 2020
Pages 111-125

  • Receive Date 31 January 2018
  • Revise Date 04 December 2018
  • Accept Date 11 December 2018
  • Publish Date 21 January 2020