Floral ecology, floral visitors and breeding system of Gandharaj lemon (Citrus × limon L. Osbeck)

Layek, Ujjwal; Kundu, Arijit; Karmakar, Prakash

doi:10.17581/bp.2020.09208

Cited by 12 publications

(19 citation statements)

References 15 publications

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“…We also calculated the relative pollinator service (RPS) for each floral visitor (Layek et al, 2020) as follows:

RPS (%) = \frac{RA \times VR \times PE i}{\sum RA \times VR \times PE i} \times 100,

where RA denotes the relative abundance of flower‐visiting species i , VR denotes the species' flower visitation rate, and PE i denotes the visitor species' single‐visit PE i . Based on the RPS values, we classified the floral visitors into four categories: (1) primary pollinators (RPS > 20%), (2) important secondary pollinators (10% < RPS ≤ 20%), (3) secondary pollinators (0 < RPS ≤ 10%) and (4) non‐pollinator (RPS = 0).…”

Section: Methodsmentioning

confidence: 99%

“…To judge whether the plant species face pollen transfer limitations in nature or not, we calculated the value for “coefficient of pollination deficit ( D )” by slight modification of the method of Layek et al (2020) as follows:

D = 1 - \frac{Ro}{Rs},

where Ro is the reproductive success (i.e., percentages of fruit or seed set) in open‐pollination treatment, and Rs is the reproductive success in supplementary pollination treatment. Here, we considered the percentages of fruit set to calculate the D value.…”

Section: Methodsmentioning

confidence: 99%

“…where Ws and Wo refer to the percentage of the fruit set (or seed set) in self (here geitonogamy) and cross-pollination, respectively. To judge whether the plant species face pollen transfer limitations in nature or not, we calculated the value for "coefficient of pollination deficit (D)" by slight modification of the method of Layek et al (2020) as follows:…”

Section: Breeding Systemmentioning

confidence: 99%

“…A high value of PEi of a floral visitor implies a high pollination efficiency (in a single visit) of the visitor species. We also calculated the relative pollinator service (RPS) for each floral visitor (Layek et al, 2020) as follows:…”

Section: Floral Visitorsmentioning

confidence: 99%

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Floral biology, breeding system and pollination ecology of Justicia betonica L. (Acanthaceae): An assessment of its low reproductive success in West Bengal, India

Layek¹,

Midday

Bisui

et al. 2022

Plant Species Biology

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Besides its importance as an ornamental plant, Justicia betonica L. is also used as a medicinal plant for the treatment of several human disorders. However, the population size and abundance of the plant species are very low in Indian states, including West Bengal. The breeding system and pollination ecology of J. betonica are still unclear. Therefore, some reproductive aspects were investigated in order to provide important information for the sustainability of the species. The flowering duration spanned from December to May, with its peak in February–March. Flower opening time was much earlier (5.00–8.00 a.m.) on a hot day (in April–May) than on a cold day (10.00 a.m.–12.00 p.m. in December–January). The time of anther dehiscence coincided with the flower opening time; however, the stigma became receptive later. The plant species is self‐compatible but dependent on pollinators for fruit and seed sets. Members of different insect groups like ants, bees, butterflies, flies, moths and wasps visit the flowers. Among them, Allorhynchium metallicum and Halictus acrocephalus are the primary pollinators (based on the “relative pollinator service”). The plant species showed a significant pollination deficit (coefficient of pollination deficit [D] = 0.32) in the open condition. Larvae of the florivorous moth Gatesclarkeana erotias significantly reduced reproductive success by eating their floral parts, ovules and immature seeds. In conclusion, combining the pollination deficit and the feeding activity of phytophagous insects (moth larvae) may reduce the reproductive fitness of J. betonica in the study regions.

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“…We also calculated the relative pollinator service (RPS) for each floral visitor (Layek et al, 2020) as follows:

RPS (%) = \frac{RA \times VR \times PE i}{\sum RA \times VR \times PE i} \times 100,

Section: Methodsmentioning

confidence: 99%

D = 1 - \frac{Ro}{Rs},

Section: Methodsmentioning

confidence: 99%

Section: Breeding Systemmentioning

confidence: 99%

Section: Floral Visitorsmentioning

confidence: 99%

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Floral biology, breeding system and pollination ecology of Justicia betonica L. (Acanthaceae): An assessment of its low reproductive success in West Bengal, India

Layek¹,

Midday

Bisui

et al. 2022

Plant Species Biology

Self Cite

View full text Add to dashboard Cite

show abstract

“…After obtaining the data of fruit set in open-pollination and manual cross-pollination treatments, we measured a coefficient of pollination deficit (D) by using the method of Layek et al (2020bLayek et al ( , 2021b as follows:…”

Section: Fruit Set and Pollination Deficiencymentioning

confidence: 99%

Supplemental Stingless Bee Pollination in Fennel (Foeniculum vulgare Mill.): An Assessment of Impacts on Native Pollinators and Crop Yield

Layek¹,

Das²,

Karmakar

2022

Front. Sustain. Food Syst.

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The yield of many crops benefits from pollinating insects; thus, recently reported declines in pollinator abundance and diversity are concerning for global food production. The pollinator dependency and amount of yield enhancement may vary according to crop species and geographical location. Fennel (Foeniculum vulgare) is an important spice crop cultivated in Indian states. However, comprehensive knowledge about pollination demand and yield enhancement potential of managed bees is still unknown. Here, we conducted a replicated study in two successive years (2020 and 2021) in West Bengal by combining pollinator surveys, pollinator-exclusion experiments, and field manipulation on fennel, which quantifies the impacts of supplemental stingless bees (Tetragonula iridipennis) pollination on native pollinators and crop yield. The crop species attracted many insect species belonging to diverse groups. Among those, important native pollinators (based on “approximate pollination value”) were Apis cerana, Apis dorsata, Apis florea, and Oxybelus furculatus in open condition (i.e., without field manipulation and in the absence of managed bees). We derived the coefficient of pollination deficit (D) from the fruit set percentages in open and manual cross-pollination treatments. The obtained value (D = 0.18) implies that the crop species have pollen transfer limitations, resulting in retardation of crop yield. From field manipulation with managed stingless bee colonies, the abundance of visitors (especially stingless bee foragers) on fennel increased (without altering the foraging activity of other native pollinators), thereby fruit set and crop yield increased by about 14.89 and 19.31%, respectively. Native managed stingless bees had no negative impacts on other native unmanaged species and can be promoted as complementary and short-term means of boosting yields and improving agricultural sustainability.

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Fruit set is moderately dependent on insect pollinators in strawberry and is limited by the availability of pollen under natural open conditions

Menzel¹

2023

The Journal of Horticultural Science and Biotechnology

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Modern strawberry (Fragaria ×ananassa Duch.) cultivars are hermaphrodite and have fertile flowers, with the anthers releasing viable pollen. Cultivars are self-compatible and do not require cross-pollination. Studies supporting managed or wild insects are based on a few reports and there are problems with the methods used to assess pollination. This review examined the role of pollination in strawberry. The mean (± s.d. or standard deviation) pollinator dependence (PD) for yield (self-pollination versus open-or insect-assisted pollination) was 0.36 ± 0.26 (P < 0.001, N = 52 studies). The yields of plants exposed to supplementary insects were higher than those exposed to pollinators under natural open conditions, with a calculated pollen limitation (PL) of 0.20 ± 0.17 (P < 0.001, N = 20 studies). Fields close to seminatural habitats, wildflowers, grass or hedges can have more pollinators and a greater diversity of pollinators than fields further away. However, a greater abundance of pollinators does not always lead to higher fruit set. Yield is dependent on insect pollinators (moderate pollinator dependence) and is limited by the availability of pollen under natural open conditions (moderate pollen limitation).

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Floral ecology, floral visitors and breeding system of Gandharaj lemon (Citrus × limon L. Osbeck)

Cited by 12 publications

References 15 publications

Floral biology, breeding system and pollination ecology of Justicia betonica L. (Acanthaceae): An assessment of its low reproductive success in West Bengal, India

Floral biology, breeding system and pollination ecology of Justicia betonica L. (Acanthaceae): An assessment of its low reproductive success in West Bengal, India

Supplemental Stingless Bee Pollination in Fennel (Foeniculum vulgare Mill.): An Assessment of Impacts on Native Pollinators and Crop Yield

Fruit set is moderately dependent on insect pollinators in strawberry and is limited by the availability of pollen under natural open conditions

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