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Pollination Studies on Both Floret and Capitulum Levels in an Oil Seed Crop, Guizotia abyssinica (L.f.) Cass. Cover

Pollination Studies on Both Floret and Capitulum Levels in an Oil Seed Crop, Guizotia abyssinica (L.f.) Cass.

Journal of Apicultural Science
Volume 65 (2021): Issue 1 (June 2021)
By: Veereshkumar,  K. M. Kumaranag,  Dibyendu Deb and  Vasuki V. Belavadi  
Open Access
|Apr 2021

Figures & Tables

Fig. 1

Capitulum and floret phenology of Guizotia abyssinica. A) Capitulum: a-ray floret, b-opened disc florets, c-unopened disc florets; B) Floret bud of disc floret; C) Opened disc floret with anther dehiscence (arrow); D)Stigmatic lobes opening (arrow); E) Elongation of stigmatic surface (arrow).
Capitulum and floret phenology of Guizotia abyssinica. A) Capitulum: a-ray floret, b-opened disc florets, c-unopened disc florets; B) Floret bud of disc floret; C) Opened disc floret with anther dehiscence (arrow); D)Stigmatic lobes opening (arrow); E) Elongation of stigmatic surface (arrow).

Fig. 2

Pollen germination, nectar cavity and seed set in Guizotia abyssinica A) Nectar cavity (arrow) inside the tube; B) No seed set in capitulum; C) Seed set (arrow) in ray floret
Pollen germination, nectar cavity and seed set in Guizotia abyssinica A) Nectar cavity (arrow) inside the tube; B) No seed set in capitulum; C) Seed set (arrow) in ray floret

Fig. 3

Floral biology of Niger, Guizotia abyssinica (* indicates peak).
Floral biology of Niger, Guizotia abyssinica (* indicates peak).

Fig. 4

Abundance of Apis cerana and A. florea on Guizotia abyssinica throughout the sampling day.
Abundance of Apis cerana and A. florea on Guizotia abyssinica throughout the sampling day.

Fig. 5

Time spent on Guizotia abyssinica by Apis cerana and A. florea: A) per floret; B) per capitulum.
Time spent on Guizotia abyssinica by Apis cerana and A. florea: A) per floret; B) per capitulum.

Fig. 6

Nectar and bee visits variation in Guizotia abyssinica before and after stigma receptivity and at the time of stigma receptivity.
Nectar and bee visits variation in Guizotia abyssinica before and after stigma receptivity and at the time of stigma receptivity.

Fig. 7

Number of bee visits per capitulum (one, two, three, four, and five bee visits) in Guizotia abyssinica and corresponding seed set (%). A) Apis cerana visits; B) A. florea visits.
Number of bee visits per capitulum (one, two, three, four, and five bee visits) in Guizotia abyssinica and corresponding seed set (%). A) Apis cerana visits; B) A. florea visits.

Supplementary Fig. 1

Hallow tubes placed on the capitulum for floret self-pollination experiment within a capitulum.
Hallow tubes placed on the capitulum for floret self-pollination experiment within a capitulum.

Supplementary Fig. 2

Biplot of pollinators abundance and environmental variables; Minimum & Maximum Air Temperature (°C); RF- rain fall (mm); RH- relative humidity (%).
Biplot of pollinators abundance and environmental variables; Minimum & Maximum Air Temperature (°C); RF- rain fall (mm); RH- relative humidity (%).

Effect of different pollination treatments on seed set of Guizotia abyssinica

Sl. No.Pollination treatmentsSeed set (%)
T1Selfing of floret00.00e
T2Selfing of capitulum00.00e
T3Pollination between capitula of same branch60.53±1.14d
T4Pollination between capitula of different branch65.66±0.84c
T5Pollination between capitula of different plant73.27±0.84b
T6Plant caged0.33±0.67e
T7Open pollination78.33±0.14a
F value4285.12
P value<0.001

List of flower visitors recorded in G_ abyssinica

S.l.noList of flower visitorsFamily
1Apis dorsataApidae
2A. cerana
3A. florea
4Haplonomia westwoodi
5Lasioglossum sp1
6Lasioglossum sp2
7Seladonia sp
8Tetragonula iridipennis
9Xylocopa latipes
10X. ruficornis
11Megachile lermaMegachilidae
12M. cephalotes
13Campsomeris sp.Scolidae
14Eristalis arvorumSyrphidae
15Ischiodon sp.
16Tirumala limniaceNymphalidae
17Chrysippus sp.
18Pieris sp.Pieridae
DOI: https://doi.org/10.2478/jas-2021-0005 | Journal eISSN: 2299-4831 | Journal ISSN: 1643-4439
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Language: English
Page range: 85 - 99
Submitted on: Dec 17, 2019
Accepted on: Nov 9, 2020
Published on: Apr 26, 2021
Published by: Research Institute of Horticulture
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year
Keywords:
bees,
foraging behaviour,
florets,
Niger,
pollination,
seed set
Related subjects:
Life sciences,
Zoology,
Life sciences, other

© 2021 Veereshkumar, K. M. Kumaranag, Dibyendu Deb, Vasuki V. Belavadi, published by Research Institute of Horticulture
This work is licensed under the Creative Commons Attribution 4.0 License.

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