Analysis of the reproduction mode in Psidium spp. using the pollen:ovule ratio

Abstract

This research aimed to explore the reproductive characteristics of three species of Psidium (P. guajava L., P. cattleyanum Sabine, and P. guineense Sw.) and estimate a probable reproduction strategy based on the pollen:ovule (P:O) methodology. The number of pollen grains per floral bud (NGPB), number of pollen grains per anther (NGPA), number of anthers per flower bud (NAB), number of ovules per flower bud (NOB), and the P:O ratio of each species were estimated. All species had a P:O ratio over 2,000 and were classified as xenogamous. P.guajava presented the highest values for all characteristics evaluated, with the NGPB at 3,777,519, the NOB at 584.50 and a P:O ratio of 6,462.82. Similarly, P. cattleyanum had a P:O ratio of 5,649.89 (NGPB 762,736 and NOB 135). However, P. guineense was considered facultative xenogamous, with P:O of 2,085.75, the NGPB at 741,484 and the NOB at 355.50. Thus, it was concluded that the studied species have a preference for allogamy and require many pollen grains to fertilize each ovule, demonstrating that the transfer of pollen to the stigma is not very specialized.

Infestation of Pink-Flesh Guava by Frugivorous Fruit Flies (Diptera: Tephritidae and Lonchaeidae) in an Orchard of Mixed Mandarin and Guava Trees at Morelos, Mexico

“…Guavas are grown commercially, in backyards, along roadsides, or in patches of disturbed wild vegetation (Lasa et al 2021). P. guajava species are allogamous (self-pollinated) and have a high rate of autogamy (Oliveira et al 2020), which explains morphological variability in nature. In Mexico, guavas are found from sea level to more than 1,700 m above sea level.…”