Journal
TURKISH JOURNAL OF BOTANY
Volume 37, Issue 5, Pages 872-885Publisher
TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY
DOI: 10.3906/bot-1209-58
Keywords
Ramonda; Gesneriaceae; pollen; seeds; hybrids; cytometry
Categories
Funding
- Ministry of Education and Science of the Republic of Serbia [173030]
- Embassy of France in Serbia [642625E, 672522H]
- AUF
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The pollen and seeds of 3 paleoendemic resurrection species, Ramonda myconi (L.) Rchb. (Iberian Peninsula), R. nathaliae Pancic & Petrovic, and R. serbica Pancic (Balkan Peninsula), as well as of natural hybrids between the 2 last species, have been analyzed using light and scanning electron microscopy. Their general structural differences, taxonomic and phylogenetic significance, pollen viability, and seed germination capacity, as well as the correlation of pollen and seed characteristics and plant ploidy levels, have been studied. The pollen grains are small (R. myconi, R. nathaliae) to medium (R. serbica) in size, ranging from 10 to 28 mu m, and 3-colporate, isopolar monads with microreticulate-perforate exine. Seeds are small, 309 to 1000 mu m long and 80 to 425 mu m wide, elongated, with a reticulate surface and auriculate ornamentation. Micromorphologies of the pollen exine ornamentation and seed surface revealed significant differences among the 3 species. Pollen from hybrid individuals was heterogeneous in size and morphology, and the germination of their tiny seeds was very low. A strong correlation was found between pollen size, DNA content, and chromosome number. The environmental influence on pollen and seeds of 3 species and especially of the R. nathaliae population growing on serpentine is also discussed.
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