Evaluation of a barley (Hordeum vulgare) chromosome 2 drought tolerance quantitative trait locus in genomic backgrounds of two cultivars

Kandemir N., Saygili I.

Plant Breeding, cilt.142, sa.2, ss.211-222, 2023 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 142 Sayı: 2
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1111/pbr.13076
  • Dergi Adı: Plant Breeding
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Agricultural & Environmental Science Database, BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Food Science & Technology Abstracts, INSPEC, Veterinary Science Database
  • Sayfa Sayıları: ss.211-222
  • Anahtar Kelimeler: background selection, ear number, harvest index, heading time, marker assisted breeding, relative water content
  • Ankara Hacı Bayram Veli Üniversitesi Adresli: Evet

Özet

A barley drought tolerance Quantitatif Trait Locus (QTL) on chromosome 2 was transferred from tolerant cultivar ‘Tadmor’ to susceptible ‘Baronesse’ and ‘Aydanhanım’. Effects of this QTL on drought tolerance and other traits were studied using near-isogenic lines under controlled environments and field trials for two years. This QTL resulted in 5.0% and 9.1% improvement in leaf relative water content of ‘Baronesse’ and ‘Aydanhanım’ cultivars, respectively, under controlled environments. The QTL accelerated heading and maturity by 2.5 days in ‘Baronesse’ and by 5–6 days in ‘Aydanhanım’. It was associated with shorter stature and more ears. This QTL region increased grain yields by 1.1 and 0.6 t/ha in ‘Baronesse’ and ‘Aydanhanım’, respectively, mainly by increasing the number of tillers. There were previous reports related to yield promoting effects of this region harbouring flowering locus eps2 (barley HvCEN gene). However, sequencing of 1025 bp fragment encompassing HvCEN coding region revealed that our parents and near-isogenic lines had no Single Nucleotide Polymorphism (SNP) variation, ruling out direct involvement of eps2. These findings pointed to the possible effect of another flowering locus in the QTL region.