Assessment of <i>in Vitro</i> Pollen Germination and Pollen Tube Growth of <i>Annona Cherimola</i> Mill

Yield in cherimoya (Annona cherimola Mill.) is affected by various factors reducing fertilization and fruit production such as: the protogynous dichogamy of flowers, deficient natural pollination, low pollen quality. The objective this study was to determine vitro differences quality nine ecotypes one cultivar A. from samples collected at female male phenological stages flowering. percentage germination length tubes evaluated 2 24 hours after incubation 21°C, two flowers during bloom 2018 2019 seasons. medium contained: 10% sucrose, 1% agar, 0.005% boric acid, 0.025% calcium nitrate. Fabulosa Austro Fino de Jete had highest stage, both stage ideal for collection anther dehiscence. longest hours, ecotypes, cultivar, showed promising characteristics hand pollination cherimoya.