Pollen performance of pomegranate under high-temperature stress

Öz

The high-temperature stress (30 °C, 35 °C, 40 °C) response of pollen performance in Punica granatum was analyzed. Pollen germination rate and tube length were significantly inhibited after 35 °C and 40 °C treatment. According to cumulative stress response index values, 40 °C had the most destructive impact. High-temperature stress caused various abnormalities at tubes, especially at apex and the most common abnormalities were marked change of elongation direction and swelling. Although dense callose accumulation and increase in apex-localized reactive oxygen species was noticed at the apex after 35 °C and 40 °C temperature treatment, the most harmful temperature was stated as 40 °C.

Anahtar Kelimeler

• High-temperature
• pollen germination
• pollen tube
• Punica granatum

Yüksek sıcaklık stresi altında narın polen performansı

Öz

Bu çalışmada Punica granatum'da polen performansının yüksek sıcaklık stresine (30 °C, 35 °C, 40 °C) olan tepkisi analiz edildi. Polen çimlenme oranı ve tüp uzunluğu 35 °C ve 40 °C uygulamasından sonra istatistiksel olarak anlamlı bir şekilde azaldı. Kümülatif stres tepki indeksi değerlerine göre, 40 °C polen performansı üzerinde en yıkıcı etkiye sahipti. Yüksek sıcaklık stresi polen tüplerinin özellikle uçlarında çeşitli anormalliklere neden oldu. En yaygın görülen anormallikler uzama yönünün değişmesi ve tüp uçlarının şişmesiydi. 35 °C ve 40 °C uygulamalarından sonra tüp uçlarında yoğun kalloz birikimi ve reaktif oksijen türlerinde artış görülmesine rağmen, en yıkıcı yüksek sıcaklık stresi 40 °C olarak belirlendi.

Anahtar Kelimeler

• polen çimlenmesi
• polen tüpü
• Punica granatum
• yüksek sıcaklık

Kaynakça

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