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Volatiles from Prunus persica Flowers and Their Correlation with Flower-Visiting Insect Community in Wanbailin Ecological Garden, China

Volatiles from plant flowers attract nectar-seeking and pollen-collecting pollinators to visit and pollinate by supplying rewards. Meanwhile, volatiles from floral branches prevent flower-robbers from foraging and pollinating. In this study, the author aimed to investigate the VOCs (volatile organic compounds) from living Prunus persica flowers of different branches and their correlation with floral insects.

Volatile collections were conducted from 2 trees of Prunus persica on sunny and shady slopes on April 29 2016 in Wanbailin Ecological Garden, Shanxi Province, China, respectively. Two fully blooming floral branches of each tree were sampled. And dominant and 20 VOCs were analyzed by closely and circularly headspace way in adsorbent tubes and ATD-GC/MS.

The results indicated that VOCs from high altitude tree were more than low altitude in sunny site, and floral volatile constituents from upslope branches were less than downslope of the same tree on high altitude. Special floral VOCs were alpha-dimethyl-benzenemethanol, isopropyl palmitate, ethylbenzene, p-xylene, acetophenone, 3-ethyl-2-methyl-Heptane on sunny slope, and propylene glycol, decanal, hexadecane on shady slope. Dominant VOCs founded during 8 temporal quanta were toluene, hexane, 2-ethyl-1-hexanol, dodecane, pentadecane.

Floral VOCs’ number from sunny slope was significantly negative correlated with flower-visiting insect community richness, abundance, diversity on sunny or shady slope, which from shady slope was significantly positive correlated with flower-visiting insect community parameters on both slopes tried dividing insects visiting floral branches from Prunus persica in sunny site with n/2 + 1 or n/2 - 1, and shady site with n/2 before sampled volatiles day. On sampled volatiles day, 2-ethyl-1-hexanol from sunny slope was significantly positive correlated with flower-visiting insect community parameters on shady slope (P < 0.001).  

In summary, special and dominant volatiles are applied to lure flower-visiting insects to promote pollination, and odd floral branches should be kept for every tree when pruning the Prunus persica on sunny slope, and even floral branches kept on shady slope.


Article by Xiujuan Du, et al, from China and Sweden.

Full access: http://mrw.so/4Oouso

Image by mari subb, from Flickr-cc.

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