Evaluation of six elite irrigated spring bread wheat (Triticum aestivum L.) varieties tolerant to heat stress during late sowing
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Tarih
2021
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Dergi ISSN
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Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
To assess the heat stress tolerance of recently released wheat varieties, six of these varieties
(Shatabdi, BARI Gom 26, BARI Gom 27, BARI Gom 28, BARI Gom 29 and BARI Gom 30) were evaluated
at two sowing conditions (optimum sowing on November 15 and extremely late sowing under heat stress
on January 15). All treatments were arranged in a randomized complete block design with a split–plot
arrangement and repeated three times. Two sowing dates were arranged in the main plots and six wheat
varieties were assigned to sub–plots. The varieties that are suitable to grow under late sowing were
recognized based on phenological data such as date of booting, heading, anthesis and physiological
maturity, growth data such as plant population, number of tillers m–2, plant height, leaf area index, total
biomass at the booting stage and plant height at harvest. Besides phenological and growth data, yield and
yield attributes such as spikes m–2, spike length (cm), spikelets spike–1, grains spike–1, 1000–grain weight
(g), grain yield (GY, kg ha–1), straw yield (kg ha–1), biological yield (kg ha–1) and harvest index were also
recorded. Stress–related parameters such as yield stability index, stress tolerance index, stress intensity
and heat susceptibility index were also estimated for final confirmation of heat tolerance of varieties. In
optimum sowing conditions, phenology, growth, yield and yield components were significantly higher
than in late sowing under heat stress. Among these wheat varieties, significantly (p < 0.01) highest GY
was obtained from Shatabdi (5,096 kg ha–1) and lowest from BARI Gom 27 (3,955.33 kg ha–1) when
sown under optimum conditions. When sown at late, BARI Gom 30 was found to be heat tolerant and
produced maximum GY (1,834.33 kg ha–1), whereas BARI Gom 27 was highly sensitive to heat and
produced the lowest GY (1,353 kg ha–1). Under both sowing conditions (optimum and late sowing),
significantly maximum GY and biological yield were recorded in variety Shatabdi (3,419 kg ha–1), and
the lowest was observed in BARI Gom 27 (2,654 kg ha–1). By evaluating heat tolerance indices, BARI
Gom 30, followed by BARI Gom 29, BARI Gom 26 and Shatabdi were found to be tolerant to heat
stress, whereas BARI Gom 27 and BARI Gom 28 were susceptible to late–sowing heat stress condition.
Therefore, except for BARI Gom 27 and BARI Gom 28, the remaining four varieties (Shatabdi, BARI
Gom 26, BARI Gom 29 and BARI Gom 30) are recommended for sown late heat stress condition and
could also be used in a future breeding program to develop heat–tolerant varieties
Açıklama
Anahtar Kelimeler
Wheat
Kaynak
THE AGRICULTURAL SCIENCE SOCIETY OF THAILAND
WoS Q Değeri
Scopus Q Değeri
Cilt
54
Sayı
1
