Viability of pollen grains and stigma receptivity in Desert Rose

Abstract Adenium obesum (Forssk.) Roem. & Schult., popularly known as desert rose, has become a valuable ornamental plant. In floriculture, the production of hybrids is prioritized. Hence, knowledge on floral biology and sexual reproduction target species fundamental. The objectives this study were: (1) to test sucrose concentrations temperatures for in vitro germination A. pollen grains; (2) identify effect temperature viability (3) evaluate grains stigma receptivity pre-anthesis, at flower opening, 72 h post-flower opening three accessions obesum. A significant relationship between was observed test. highest percentage grains, 39.81%, an estimated 26.05 °C. Desert rose maintained biochemical oxygen demand (BOD) chambers 30 °C during 16-h light photoperiod showed faster flowering, ≥ 25 induced grain percentages above 69%. Temperature one most important abiotic factors, influencing mainly germination, tube growing efficiency fertilization. ICA-wd accession stood out can be considered donor artificial pollination. stigmas flowers were receptive from day before until days after. two parameters presented above, viability, allow inferences about appropriate time successful pollination subsequent fertilization roses.