Germination efficiency and plant stand in early sown synthetic wheat derived population
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
Wheat crop has specific temperature requirements. In Punjab, wheat is generally sown from
last week of October till last week of November and harvested after mid-April. The early
sown crop has more time to attain maturity and produces higher yield than the late sown crop.
However, a shift in sowing dates imposes temperature stress at different crop growth stages.
The present study was conducted on synthetic wheat lines derived from Aegilops tauschii ×
Triticum durum with an aim to identify heat tolerant lines. These lines were evaluated at
normal (25°C and 30°C) and high temperatures (35°C) under laboratory conditions and
thereafter in field exposed to heat stress by shifting normal sowing date to early and late
sowing. The activity of α-amylase was one of the criteria to determine heat stress tolerance at
seedling stage. The lines HT8, HT12, HT13 performed well under high temperature stress in
both laboratory conditions and in the field. Under laboratory conditions, these lines had
maximum α-amylase activity and coleoptile length. In field conditions, these lines had high
early growth vigor, yield and thousand grain weight. So, these can be identified as heat stress
tolerant lines while HT140 and HT157 neither germinate at high temperature in laboratory
nor gave much yield under temperature stress in field and also α-amylase activity was lowest.
These lines were regarded as heat susceptible lines. The results of this study may prove useful
in the selection of potential donors for heat stress tolerance.
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Citation
Navdeep Kaur (2021). Germination efficiency and plant stand in early sown synthetic wheat derived population (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.