Stigma Receptivity of Endemic Tripleurospermum ziganaense (Asteraceae)

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Sağan R., İnceer H.

7th Symposium on EuroAsian Biodiversity (SEAB)–2024, Erzurum, Türkiye, 22 - 24 Ağustos 2024, ss.3-4, (Özet Bildiri)

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: Erzurum
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.3-4
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

Stigma receptivity, which involves many biochemical processes such as capturing pollen through adhesion, allowing its hydration, and ultimately forming a pollen tube, is an important stage in the maturation of a flower and hence, it has a critical role in reproductive biology and genetic diversity. Therefore, it is a parameter used for conservation studies of threatened species. Tripleurospermum ziganaense known from only one population in Gümüşhane is endemic to Türkiye. It is critically endangered (CR) species due to several antropogenic pressures. In this study, we presented the results of stigma receptivity test of this species for the first time. In order to determine the stigma receptivity hydrogen peroxide (H2O2) were used.  Plant materials were collected from Gümüşhane province, where its natural population is located, in pre-anthesis and anthesis stages. Stigmas obtained from disk flowers, in pre-anthesis and anthesis stages were stained with solution of H2O2 for 2 hours. As a result of the observations, bubbles formed on the stigma were considered ready for receptivity or pollen reception, while the absence of bubbles was considered as the stigma not being suitable for pollination and fertilization yet. According to the results obtained herein, the stigma receptivity score for T. ziganaense is 1.66±0.47 with H2O2 in anthesis. However, the bubbles on the stigmas are not observed in pre-anthesis stage. This findings indicate that the stigma receptivity is pozitif in anthesis stage, while it is negative in pre-anthesis stage in this species. The present data obtained from stigma viability can be used for reproductive biology and conservation acvities of the endangered endemic T. ziganaense as well as other treatened endemic species of Tripleurospermum.

 

Keywords: Tripleurospermum ziganaense, stigma receptivity, hydrogen peroxide, conservatio