Regulation of
            <scp>NO</scp>
            Biosynthesis Under Abiotic Stresses and Modulation Due to Osmolytes

Fatima, Kaneez; Sardar, Fozia; Imran, Asma

doi:10.1002/9781119800156.ch2

Cited by 1 publication

(1 citation statement)

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“…In addition, for fertilization to take place, the pollen tubes must be long enough to reach the embryo sac by growing along the style; therefore, another key parameter for assessing the effects of environmental stressors on pollen is the length of the pollen tube [ 27 ]. To extend the basic assessments, it is also essential to focus on antioxidant activity and changes in phenolic and flavonoid content; this is because excessive stress-induced ROS production (which limits pollen germination capacity and tube elongation) must be removed by enzymatic antioxidants such as superoxide dismutase (SOD), catalase (CAT) and peroxidase [ 20 , 28 , 29 ]. In addition, phenolic compounds also show antioxidant properties that protect cells and tissues from the toxic effect of ROS [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

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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