Evaluation of phenolic and flavonoid compounds in pollen grains of three<i>Citrus</i>species in response to low temperature

Mohammadrezakhani, Soheila; Hajilou, Jafar; Rezanejad, Farkhondeh

doi:10.1080/00173134.2017.1358763

Cited by 10 publications

(2 citation statements)

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“…In addition, phenolic compounds work as indicators of stress because they accumulate at high levels in many plant tissues in response to a wide range of abiotic signals [ 46 ]. For example, a decrease in phenolic compounds induced by heat stress has been reported in pollen grains of several citrus species [ 47 ]. Among phenolic compounds, flavonoids are the key molecules in the stress response [ 24 ].…”

Section: Discussionmentioning

confidence: 99%

“…Rezanejad [ 48 ] reported that air pollution induces the accumulation of flavonoids in pollen of Spartium junceum , Lagerstroemia indica , Thuja orientalis and Petunia hybrida . In addition to a decrease in phenolic compounds, heat stress also induced a decrease in the flavonoid content in pollen grains of several citrus species [ 47 ]. Thus, changes in flavonoid content could provide information about the effects and intensity of stress.…”

Section: Discussionmentioning

confidence: 99%

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Effects of UV-B Radiation on the Performance, Antioxidant Response and Protective Compounds of Hazelnut Pollen

Çetinbaş-Genç

TOKSÖZ

Piccini

et al. 2022

Plants

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Increasing ultraviolet (UV) radiation is expected to become a problem in hazelnut cultivation. The aim of this study is to examine the effects of UV-B on hazelnut pollen. To this end, the pollens were exposed to UV-B for 1, 2, and 3 h at distances of 10, 20, 30, and 40 cm. Groups treated for 2 h at 20 cm and 3 h at 10 and 20 cm were identified as the most affected based on the results of viability, germination, and tube elongation. Further studies on these groups showed that UV-B does not change the DPPH radical scavenging activity for all groups. However, total phenolic compounds decreased after 3 h of treatment at 10 and 20 cm, while total flavonoid compounds decreased after all treatment groups. The UV-B absorbance of cytoplasmic and cell-wall-bound fractions decreased for all groups. The UV-B absorbance of the sporopollenin-derived fraction increased after 2 h of treatment at 20 cm but decreases after treatment for 3 h at 10 and 20 cm. In summary, exposure to UV-B for different times and distances adversely affected pollen grains in terms of pollen viability, germination rate, tube length, and the level of antioxidant molecules and UV-absorbing compounds.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%