Pollen Viability and Stigma Receptivity of Large-and Abortive-seeded Longan(Dimocarpus longan)
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摘要: 以焦核龙眼‘闽焦64-2’、‘白核’、大核龙眼‘九月乌’为材料, 采用离体萌发法, 研究了萌发时间、光照、蔗糖和硼酸浓度对花粉活力的影响, 并采用联苯胺-过氧化氢测定法研究柱头可授性。结果表明:3个龙眼品种花粉萌发率随时间延长变化不同, ‘闽焦64-2’和‘白核’的花粉活力低于‘九月乌’;光照能显著提高‘闽焦64-2’的花粉萌发率, 而对另外2个品种无显著影响;3个品种适宜的蔗糖浓度均为5%10%, 适宜的硼酸浓度不同, 分别为50100、50200和100200mg·L-1;3个品种开花当天柱头都具有可授性, 可授期均为6d。Abstract: Cultivars of the abortive-seeded longans, Minjiao 64-2and Baihe, and the large-seeded Jiuyuewu were used for the experimentation.The effects of time, light, and sucrose and boric acid concentrations on the pollen viability were determined by the seed′s in vitro germination, and the stigma receptivity, by the method of benzidine-hydrogen peroxide.The results showed that the pollen viability of the 3cultivars changed with time, and those of Minjiao 64-2and Baihe were lower than that of Jiuyuewu.Light exposure significantly increased the germination rate for Minjiao64-2, but not for Baihe or Jiuyuewu.The suitable sugar content ranged 5%-10%for all three varieties.And, the adequate boric acid content was 50-100mg·L-1 for Minjiao 64-2, 50-200mg·L-1 for Baihe, and 100-200mg·L-1 for Jiuyuewu.The stigmas of the 3cultivars appeared to be receptive from the first to the fifth day after blooming.
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Key words:
- Longan /
- abortive-seeded /
- pollen viability /
- stigma receptivity
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