RT article T1 Parthenocarpy and Self-Incompatibility in Mandarins A1 Montalt, Rafael A1 Vives, María C. A1 Navarro, Luis A1 Ollitrault, Patrick A1 Aleza, Pablo K1 Seedless K1 Parthenocarpic ability K1 Fruit setting K1 F02 Plant propagation K1 F30 Plant genetics and breeding K1 F63 Plant physiology - Reproduction K1 Q01 Food science and technology K1 F60 Plant physiology and biochemistry K1 Citrus K1 Seedlessness K1 Pollination K1 Fruit set K1 Breeding AB Citrus reproductive biology is complex. One of its characteristic features is parthenocarpy that enables seedless fruit production. Citrus parthenocarpy and self-incompatibility knowledge is only partial and sometimes discrepant. Increasing such knowledge is relevant for better managing cultivated varieties and improving the selection of parents in breeding strategies to recover seedless varieties such as mandarins. This work develops an efficient protocol to characterize selfincompatibility and different parthenocarpy types based on emasculation, hand self-pollination, and hand cross-pollination. It analyzes fruit setting and seed production coupled with histological pollen performance observations. We analyzed the reproductive behavior of nine mandarin varieties with relevant characteristics as parents for seedless mandarin breeding. ‘Clemenules’ clementine and ‘Moncada’ mandarins were strictly self-incompatible with facultative and vegetative parthenocarpy; ‘Imperial’ mandarin and ‘Ellendale’ tangor displayed no strict self-incompatibility associated with facultative and vegetative parthenocarpy; ‘Fortune’ mandarin was self-incompatible with facultative and stimulative parthenocarpy; ‘Campeona’ and ‘Salteñita’ mandarins were self-compatible with vegetative parthenocarpy; ‘Serafines’ satsuma was associated with male sterility together with facultative and vegetative parthenocarpy; and ‘Monreal’ clementine was self-compatible and nonparthenocarpic. Our protocol can be applied for screening of mandarin germplasm and to characterize new parents. Reproductive behavior knowledge is important for optimizing seedless mandarin breeding programs based on diploidy, triploidy, or induced mutagenesis. PB MDPI SN 2073-4395 YR 2021 FD 2021 LK http://hdl.handle.net/20.500.11939/7758 UL http://hdl.handle.net/20.500.11939/7758 LA en NO Montalt, R., Vives, M. C., Navarro, L., Ollitrault, P. & Aleza, P. (2021). Parthenocarpy and Self-Incompatibility in Mandarins. Agronomy, 11(10), 2023. DS MINDS@UW RD Aug 19, 2022