Effect of drought stress on the foraging behavior of  insect pollinators and the reproductive success of  canola (Brassica napus L.)

Younas, Muqaddas; Ali, Mudssar; Matloob, Amar; Sajjad, Asif; Gul, Hafiza Tahira; Saeed, Shafqat

doi:10.9755/ejfa.2022.v34.i2.2817

Cited by 1 publication

(1 citation statement)

References 47 publications

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“…Thus, the floral olfactory cues are likely not affected in this crop species, even if the temperature on earth increases by up to 5 °C until 2100. This species, however, seems to be more sensitive to other stressors, such as drought and ozone, which both affect floral scent signaling and have negative effects on pollinator attraction [ 68 , 69 ].…”

Section: Resultsmentioning

confidence: 99%

Floral Scents in Bee-Pollinated Buckwheat and Oilseed Rape under a Global Warming Scenario

Cordeiro

Dötterl

2023

Insects

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Many wild plants and crops are pollinated by insects, which often use floral scents to locate their host plants. The production and emission of floral scents are temperature-dependent; however, little is known about how global warming affects scent emissions and the attraction of pollinators. We used a combination of chemical analytical and electrophysiological approaches to quantify the influence of a global warming scenario (+5 °C in this century) on the floral scent emissions of two important crop species, i.e., buckwheat (Fagopyrum esculentum) and oilseed rape (Brassica napus), and to test whether compounds that are potentially different between the treatments can be detected by their bee pollinators (Apis mellifera and Bombus terrestris). We found that only buckwheat was affected by increased temperatures. Independent of temperature, the scent of oilseed rape was dominated by p-anisaldehyde and linalool, with no differences in relative scent composition and the total amount of scent. Buckwheat emitted 2.4 ng of scent per flower and hour at optimal temperatures, dominated by 2- and 3-methylbutanoic acid (46%) and linalool (10%), and at warmer temperatures threefold less scent (0.7 ng/flower/hour), with increased contributions of 2- and 3-methylbutanoic acid (73%) to the total scent and linalool and other compounds being absent. The antennae of the pollinators responded to various buckwheat floral scent compounds, among them compounds that disappeared at increased temperatures or were affected in their (relative) amounts. Our results highlight that increased temperatures differentially affect floral scent emissions of crop plants and that, in buckwheat, the temperature-induced changes in floral scent emissions affect the olfactory perception of the flowers by bees. Future studies should test whether these differences in olfactory perception translate into different attractiveness of buckwheat flowers to bees.

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Section: Resultsmentioning

confidence: 99%