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

Acta Scientiarum: Agronomy

Rodrigo Miranda Barbosa¹  Maria Lorraine FonsecaOliveira¹  Telma Nair Santana Pereira¹  Alexandre Pio Viana¹ 

[1] Universidade Estadual do Norte Fluminense Darcy Ribeiro;

关键词: Allogamy;    autogamy;    Psidium cattleyanum;    Psidium guajava;    Psidium guineense.;   

DOI  :  10.4025/actasciagron.v43i1.44062

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown