Abstract Detail

Reproductive Processes

Pereira-Silva, Brenda  [1], De Paula, Livia Maria [1], Carvalho-Leite, Ludimila Juliele [1], Martins-Morais, Paulo Wesley [1], Machado-Santos, Pedro Henrique [1], Paulino-Neto , Hipólito Ferreira [2].

Floral and reproductive biology of Luehea grandiflora (Malvaceae) in a Brazilian Savanna.

Luehea grandiflora is considered a chiropterophilous species, whose reproductive biology and pollination have not yet been studied in the Brazilian Savanna (Cerrado) of Southwest Minas Gerais, Brazil. This study investigated the floral and reproductive biology of Luehea grandiflora Mart e Zucc (Malvaceae). The hand pollination experiment was carried out in a Cerrado area in Passos-MG between June 2017 and August 2018. We investigated the biology and longevity and morphology of flowers (n=30). We measured the volume and concentration of nectar produced every two hours throughout 24 hours in 10 flowers distributed in 10 plants. We also recorded the nectar volume and concentration accumulated since anthesis until 8:00 am in 35 flowers belonging to 35 plants with microsyringes of 1 mL (0.05 ml precision) and a hand refractometer (reading range: 0 – 50 Brix). The breeding system was determined through controlled hand pollination experiments in 32 plants, four treatments per plant (cross-pollination, self-pollination, geitonogamy and control). The anthesis was twilight (04:30-07:00 pm) with anthers already releasing pollen and with receptive stigma since the opening. However, receptivity is more intense about 09:00 pm. Our data showed that stigmas remained receptive for 72 hours. The petals measured 2.30 ± 0.56 cm and sepals 4.28 ± 0.53 cm (x±SD; n=30) in length. Nectar production occurred continuously between 8:00 pm and 08:00 am, however the highest sugar volume and concentration  was recorded from 00:00 to 02:00 am, with 79 ± 54.45 μL and 13.68 ± 3.7% (x±SD; n=10), respectively. The total nectar volume was 277.72 ± 153.99 μL and its concentration was 14.04 ± 1.79% (x ±SD; n=35). Luehea gradiflora is allogamic species  with Reproductive Efficacy Index (REI) of 0.92,  considered high, indicating that they plants belong of the studied population do did not present pollen limitation, since 81.25% and 87.5% of the flowers developed fruits in the treatments of natural pollination and cross-pollination, respectively. Therefore, remaining functionally female for 72 hours (three daytime and three nighttime periods) can increase your reproductive success.

1 - Universidade do Estado de Minas Gerais, Unidade Passos/ Curso de Ciências Biológicas, Av. Juca Stockler, 1130, Belo Horizonte, Passos, Minas Gerais, 37900-106, Brasil
2 - Universidade do Estado de Minas Gerais, Unidade Passos/ Curso de Ciências Biológicas, Av. Juca Stockler, 1130, Belo Horizonte , Passos, Minas Gerais, 37900-106, Brazil

bat pollination
Brazilian Savanna
Breeding System
floral morphology
floral longevity
reproductive biology
pollination biology
Floral biology
Luehea grandiflora
reproductive success

Presentation Type: Poster
Session: P, Reproductive Processes Posters
Location: Virtual/Virtual
Date: Thursday, July 30th, 2020
Time: 5:00 PM Time and date to be determined
Number: PRP004
Abstract ID:881
Candidate for Awards:None

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