Relationship between Varietal Difference in Fruit Set and Morphological Difference in Styles among Self-Compatible Japanese Pears

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  • 自家和合性ニホンナシ品種間の自家結実性の差異と花柱組織との関係
  • ジカ ワゴウセイ ニホンナシ ヒンシュ カン ノ ジカ ケツジツセイ ノ サイ ト ハナ チュウ ソシキ ト ノ カンケイ

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Abstract

<p>We studied the self-pollination fruition rate of subvars of the original Japanese pear ‘Osa-nijisseiki’ (‘Akibae’, ‘Akikansen’, ‘Natsusoyoka’ and ‘Shinmizuki’) by examining plants at 4 and 16 weeks after pollination over three years. Findings showed that after 4 weeks of pollination, the fruition rates among the cultivars differed significantly. Among the four cultivars, the fruition rates of ‘Akibae’ and ‘Natsusoyoka’ were low. The fruition rates of these cultivars further declined from 4 to 16 weeks after pollination. Next, we found that there were similar trends with the self-pollination test in mutual pollination tests. In order to determine the reason for the difference in self-pollination fruition, we examined pollen tube growth 72 hours after pollination. We found that in ‘Akibae’ and ‘Natsusoyoka’, the cells of transmitting tissue had been destroyed, resulting in a hollow tube. Thus, the destruction of pollen tubes may contributes to accelerating the rate of pistil aging in ‘Akibae’ and ‘Natsusoyoka’, thereby, leading to a shorter pollination period and low fruition rate for self-pollination.</p>

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