Determination of high temperature tolerance via screening of flower and fruit formation in tomato

Yüksek sıcaklık stresinin ondört domates genotipinde çiçek ve meyve gelişimine etkileri incelenmiştir. Dört genotip Şanlıurfa yerli domatesinden seçilmiş (U-4-10, U-64-16, U-2-29 ve U-117-2) ve diğer genotipler Asya Sebze Araştırma ve Geliştirme Merkezi (Asian Vegetable Researc and Development Center; AVRDC)’nden sağlanmıştır. Üç arazi denemesi üç sıcaklık rejimi sağlamak üzere planlanmıştır; optimum (OT, 28/21°C gündüz/gece), orta yüksek (MHT, 32/22°C gündüz/gece) ve yüksek (HT, 37/27°C gündüz/gece). Çiçek ve meyve gelişiminin değerlendirilmesinde tohumlu meyve (SF), partenokarpik (tohumsuz) meyve (PF), gelişmemiş çiçek (UF) ve aborsiyona uğramış çiçek (AF) kriterleri kullanılmıştır. Yüksek sıcaklık rejimi bütün genotiplerde tohumlu meyve oranında dramatik düşüşlere, partenokarpik meyve, gelişmemiş çiçek ve aborsiyona uğramış çiçek oranında da artışlara yol açmıştır. Sonuçlar dört yerli domates genotipinin (U-4-10, U-64-16, U-2-29, U-117-2) domates ıslahında sıcağa tolerans için değerli bir gen kaynağı olabileceğini göstermiştir. SF yüzdesi, PF üretimi ve AF oranı sıcağa toleransın belirlenmesinde güvenilir kriterler olabilir.

Domateste yüksek sıcaklığa toleransın çiçek ve meyve oluşumu ile belirlenmesi

The effects of high temperature stress on flower and fruit development were examined in fourteen tomato genotypes. Four genotypes were selected from landraces in Sanliurfa province (U-4-10, U-64-16, U-2-29, and U-117- 2) and the other genotypes were provided by the Asian Vegetable Research and Development Center (AVRDC). The field experiment was designed to yield three temperature regimes; optimum (OT, 28/21°C day/night), moderate high (MHT, 32/22°C day/night) and high (HT, 37/27°C day/night) by transplanting the seedlings at different time intervals. The parameters of seeded fruit (SF), parthenocarpic (seedless), fruit (PF), undeveloped flower (UF), and aborted flower (AF) were used to evaluate flower and fruit development. The HT regime resulted in dramatic decreases in seeded fruit and increases in parthenocarpic fruit, undeveloped flower and flower abortion. The results showed that four domestic tomato genotypes (U-4-10, U-64-16, U-2-29, and U-117-2) could be valuable source of heat-tolerant germplasm for tomato breeding programs. Percentage of SF, PF production and rate of AF may be reliable criteria for determination of heat tolerance.

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