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    Alleviation of Cadmium Stress on Pollens of Quince Varieties Through Epibrassinolide
    (Springer, 2024) Muradoglu, Ferhad; Beyhan, Omer; Demir, Taki; Manzoor, Muhammad Arsalan; Sonmez, Ferit; Balik, Hueseyin Irfan
    Environmental factors significantly impact plant physiological processes, especially during pollination and fertilization. Pollen germination (PG) and pollen tube length (PTL), crucial in plant reproduction, are particularly vulnerable to environmental contaminants that affect fruit sets adversely. This study investigated the impact of varying cadmium (Cd) doses, a significant toxic heavy metal, and the alleviative potential of external 24-epibrassinolide (24-epiBL) applications on cadmium stress, determined through PG and PTL. Quince pollen viability rates, assessed using the TTC (2-3-5-triphenyl tetrazolium chloride) viability test, varied between 38.58% and 55.80%. PG and PTL rates decreased in response to higher Cd doses. The application of epiBL increased PG and PTL, but a notable decline was observed at the 2.00 mu M application. A positive relationship between the application dosage of epiBL and its alleviation effect on Cd stress on PG and PTL was observed except for the 2.00 mM. Results revealed variability in PG and PTL rates among quince varieties, and PG and PTL rates decreased with higher Cd doses. This study suggests that epiBL up to 0.50 mM is an efficient tool for alleviating Cd stress in quince pollens.
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    RESPONSE TO HEAVY METALS ON POLLEN VIABILITY, GERMINATION AND TUBE GROWTH OF SOME APPLE CULTIVARS
    (Parlar Scientific Publications (P S P), 2017) Muradoglu, Ferhad; Beyhan, Omer; Sonmez, Ferit
    Heavy metal toxicity is one of the major abiotic stresses leading to hazardous effects in plants and pollen are among the most sensitive to atmospheric pollution. Both pollen germination and tube length are inhibited by adverse environmental conditions. Pollen grains from three apple (Gala, Fuji and Braeburn) cultivars were tested for determination of pollen quality (pollen viability, germination ability and tube length) and five types of Heavy metals (Cd, Co, Pb, Hg and Zn). Viability of the pollens were determined by TTC test. The pollen germination experiments were conducted in petri dishes in 10% sucrose, 0.01% boric acid and 22 degrees C temperature for 3 hours. Among the cultivars highest pollen viability were recorded in Braeburn with 81.85%. Heavy metals lead to a significant decrease in pollen germination and tube length of apple cultivars. It was found that there were different cultivars with variable sensitivity to heavy metals on pollen germination and tube length. In general, increasing heavy metal treatments inhibited pollen germination and tube length in all cultivars. Among heavy metals mercury (Hg) had the highest toxic effect on pollen growth and tube length of all cultivars. Heavy metals have negative effect on reproduction of plant due to inhibition of pollen viability and germination.