Tropes

ScienceDaily_2014 08121.txt

#Bees can be more important than fertilizera lack of bees and other wild insects to pollinate crop plants can reduce harvest yields more drastically than a lack of fertilizer or a failure to provide the crops with sufficient water. When crops are pollinated adequately on the other hand the plants bear more fruit and their nutrient content changes. These are the findings of an experiment on almond trees conducted in California by the Freiburg ecologist Prof. Dr. Alexandra-Maria Klein and her colleagues from the USA. The team published articles presenting their findings in the journals Plant Biology and PLOS ONE. Alexandra-Maria Klein will receive the 25000-euro CULTURA Prize on Tuesday 17 june 2014 for this and other research projects on the importance of insects for the pollination of crop plants. Conferred by the Alfred Toepfer Foundation the prize recognizes European scientists for innovative and exemplary research approaches in the areas of nature conservation agriculture and forestry and related sciences. Together with students and colleagues at the University of California Berkeley Alexandra Klein manipulated almond trees by preventing bees from pollinating blossoms with the help of cages allowing the bees to pollinate the blossoms or pollinating them by hand. In addition the researchers watered and fertilized trees in accordance with local practices or gave them only little water or no fertilizer. In the case of several almond trees they combined the various manipulations in order to study in isolation and in combination the effects on harvest yield and the composition of nutrients in the nuts. The almond trees that were pollinated by hand produced the most nuts but they were also very small. By contrast a tree that was left unpollinated hardly produced any nuts at all --but the few that it did produce were very large. The yield of the trees pollinated by bees was roughly 200 percent higher than that of self-pollinatedtrees. Fertilization and watering only had an effect on harvest yield in combination with the pollination manipulations. However the inadequately watered trees lost more leaves and the leaves of the unfertilized trees increasingly turned yellow. This led the scientists to the conclusion that an almond tree can compensate for a lack of nutrients and water in the short term by directing stored nutrients and water to the fruits but cannot compensate for insufficient pollination. Furthermore the scientists demonstrated that the composition of nutrients differs depending on the pollination mode: Nuts from the self-pollinated trees contained a lower proportion of linoleic acid but a higher proportion of Vitamin e. Story Source: The above story is provided based on materials by Albert-Ludwigs-Universitã¤t Freiburg. Note: Materials may be edited for content and length. Journal References c

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