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

Veereshkumar,

Veereshkumar,

  • Department of Entomology, UAS, GKVKBangalore, India
  • ICAR-Central Agroforestry Research InstituteJhansi, India
  • ICAR-National Bureau of Agricultural Insect ResourcesBengaluru, India
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Veereshkumar,
, 
K. M. Kumaranag

K. M. Kumaranag

  • Department of Entomology, UAS, GKVKBangalore, India
  • Division of Entomology, Indian Agricultural Research Institute (IARI)New Delhi, India
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Kumaranag, K. M.
, 
Dibyendu Deb

Dibyendu Deb

ICAR- Indian Grassland and Fodder Research InstituteJhansi, India
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Deb, Dibyendu
 e 
Vasuki V. Belavadi

Vasuki V. Belavadi

Department of Entomology, UAS, GKVKBangalore, India
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Belavadi, Vasuki V.
  
26 apr 2021
Pollination Studies on Both Floret and Capitulum Levels in an Oil Seed Crop, Guizotia abyssinica (L.f.) Cass.'s Cover Image
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Categoria dell'articolo: Original Article
Pubblicato online: 26 apr 2021
Pagine: 85 - 99
Ricevuto: 17 dic 2019
Accettato: 09 nov 2020
DOI: https://doi.org/10.2478/jas-2021-0005
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© 2021 Veereshkumar et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

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 treatments Seed set (%)
T1 Selfing of floret 00.00e
T2 Selfing of capitulum 00.00e
T3 Pollination between capitula of same branch 60.53±1.14d
T4 Pollination between capitula of different branch 65.66±0.84c
T5 Pollination between capitula of different plant 73.27±0.84b
T6 Plant caged 0.33±0.67e
T7 Open pollination 78.33±0.14a
F value 4285.12
P value <0.001

List of flower visitors recorded in G_ abyssinica

S.l.no List of flower visitors Family
1 Apis dorsata Apidae
2 A. cerana
3 A. florea
4 Haplonomia westwoodi
5 Lasioglossum sp1
6 Lasioglossum sp2
7 Seladonia sp
8 Tetragonula iridipennis
9 Xylocopa latipes
10 X. ruficornis
11 Megachile lerma Megachilidae
12 M. cephalotes
13 Campsomeris sp. Scolidae
14 Eristalis arvorum Syrphidae
15 Ischiodon sp.
16 Tirumala limniace Nymphalidae
17 Chrysippus sp.
18 Pieris sp. Pieridae
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