Gras, P.

Kraft, M.

Pawelzik, E.

Smit, I.

Tscharntke, T.

Westphal, C.

Wietzke, A.

English

JKI Open Journal Systems (Julius Kühn-Institut)

  DEUTSCHE GESELLSCHAFT FÜR QUALITÄTSFORSCHUNG (PFLANZLICHE NAHRUNGSMITTEL) e.V.  50. Vortragstagung, 14./15.März 2016 Julius Kühn-Institut, Berlin    Pollination as a key factor for strawberry fruit physiology and quality  A. Wietzke1,2, C. Westphal2, M. Kraft1, P. Gras2, T. Tscharntke2, E. Pawelzik1, I. Smit1*  1Quality of Plant Products, Department of Crop Sciences, University of Göttingen,  Carl-Sprengel-Weg 1, 37075 Göttingen;  2Agroecology, Department of Crop Sciences, University of Göttingen,  Grisebachstrasse 6, 37077 Göttingen Email*: ismit@gwdg.de   Insect pollination improves fruit quality [2, 5]  by increasing the amount of fertilized achenes [4]. The achenes are considered to be the place of indolyl-3-acetic acid (IAA, phytohormone) formation [3] which is associated with receptacle development of non-climacteric strawberry fruits [1]. Exclusion of pollinating insects (mainly bees) bears the risk of marketable yield decline [2], which highlights the ecological and economic importance of insect pollination for strawberries. Our study evaluates the effects of pollination on IAA formation and quality parameters during strawberry fruit development and ripening. Pollination treatments included autonomous self-pollination (SP), hand pollination (HP) and open pollination (OP) by insects and wind. We harvested and analysed fruits in three developmental stages indicated by colour (green, white and red).  SP led to lowered pollination success, a non-typical phytohormone formation and a predominant share of deformed fruits (> 90%). SP plants produced the smallest and lightest fruits which reached by far the lowest commercial value. Moreover, shelf life decline of SP fruits during storage was accelerated. Compared to OP fruits, HP fruits reached the lowest ratio of total soluble solids to titratable acid, but showed no increase in commercial value calculated based on visible quality aspects. This study underlines the importance of maintaining ecosystem services like insect pollination for agricultural production.  Literature [1] Given NK, Venis MA, Grierson D (1988) Hormonal regulation of ripening in the strawberry, a non-climacteric fruit. Planta 174: 402–406.  [2] Klatt BK, Holzschuh A, Westphal C, Clough Y, Smit I, Pawelzik E, Tscharntke T (2014) Bee pollination improves crop quality, shelf life and commercial value. Proc. R. Soc. B 281 (1775), 20132440.  49  [3] Nitsch JP (1950) Growth and morphogenesis of the strawberry as related to auxin. Am. J. Bot. 37: 211–215.  [4] Svensson B (1991) The importance of honeybee-pollination for the quality and quantity of strawberries (Fragaria x ananassa) in central Sweden. Acta Hort. 288: 260–264.  [5] Zebrowska J (1998) Influence of pollination modes on yield components in strawberry (Fragaria × ananassa Duch.). Plant Breed. 117: 255–260.    50  

Pollination as a key factor for strawberry fruit physiology and quality

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Pollination as a key factor for strawberry fruit physiology and quality

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