Varietal Differences in Pollen Fertility and Malformed Fruit Emergence in Strawberry Forcing Culture

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  • イチゴ促成栽培における花粉稔性及び奇形果発生の品種間差異
  • イチゴ ソクセイ サイバイ ニ オケル カフン ネンセイ オヨビ キケイカハッセイ ノ ヒンシュ カン サイ

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Abstract

In strawberry forcing culture, some cultivars yield malformed fruits. We investigated pollen fertility and the degree of malformed fruit emergence as well as the causal relationships between them using 6 of recently bred June-bearing cultivars. The cultivars 'Yumenoka', 'Tochiotome', 'Akihime', 'Sagahonoka', 'Kumaken-i-548' (alias 'Hinoshizuku'), and 'Yayoihime' were tested. The pollen germination rate was used as an indicator of pollen fertility. 1. The pollen germination rate of all cultivars under heating conditions (>= 5 deg C) decreased in January and February. The rates of 'Yumenoka' and 'Tochiotome' were under 10%, and the rates of other cultivars were approximately 20%. 2. The pollen fertility of plants grown under heating conditions and under no-heating conditions was compared. The germination rate of pollen grown under no-heating conditions was generally equal to that of pollen grown under heating conditions in all cultivars. 3. The fruits of 'Hinoshizuku' and 'Yayoihime' which were pollinated by bees, were frequently malformed because of non-fertilization in January. Meanwhile, the fruits of 'Yumenoka' and 'Tochiotome' under the same conditions were less malformed even though their pollen fertility was lower than that of the above cultivars. 4. The self-pollination tests conducted in January and March showed no correlation between pollen fertility and degree of malformed fruit emergence.

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