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Improvement of Hybridization in Hibiscus rosa-sinensis L.
|關鍵字:||Hibiscus rosa-sinensis L.|
pollen germination rate
試驗之25個朱槿品種（營養系）花粉發芽率差異性很大，其中只有5個品種發芽率較高，分別為‘Cadace’之23 %、‘Como’之19 %、粉紅花‘0112’之32 %、紅花‘0146’之23.5 %與黃花‘8159’之17 %，其他品種花粉發芽率則普遍低於15 %。
選擇花粉活力高的親本，於適當之氣溫條件下進行授粉，花朵脫落後配合子房噴水處理或子房頂端羊毛脂膏處理，可使著果率由0 %最高分別提高為20 %或88 %，並獲得發育正常之種子。第一年實施噴水處理獲得9個果莢共92粒種子，平均每個果莢可得10.2粒種子。第二年實施羊毛脂膏處理獲得95個果莢共1406粒種子，平均每個果莢可得14.8粒種子，結種數比噴水處理提高45 %。
Twenty five cultivars/clones of Hibiscus rosa-sinensis L. were propagated by cutting. Pollen viability was tested. Following hybridization, fruit set was observed in order to understand the problems of low fertility. Furthermore, good seedlings in offspring population were selected. The pollen viability of 25 H. rosa-sinensis L. cultivars were varied, only five cultivars ‘Cadace', ‘Como', ‘0112', ‘0146' and ‘8159' own better viability. The pollen germination rate was 23 %, 19 %, 32 %, 23.5 % and 17 %, respectively. Relatively, the pollen germination rate of the other cultivars were lesser than 15 %. Temperature has a great effect on the pollen viability of H. rosa-sinensis. When they exposed to unsuitable temperature above 28℃ or below 15℃ during five days before flowering or anthesis accumulate more than 10 hours, the pollen viability decrease obviously. In addition, the top of ovary were come into being a hole after style abscised. It caused wither of ovules in the ovary under sunny days, resulted in the failure of fruit set. To use parents with high pollen viability, and to pollinate suitable temperature, then to spray water or to apply lanolin paste to the top of ovary, improved the fruit set rate from 0 % to 20 % or 88 % respectively. Moreover, using water spray treatment first year obtained 9 capsules and 92 seeds in number, the average mature seeds per capsule were 10.2. Using lanolin paste treatment second year obtained 95 capsules and 1406 seeds in number, the average mature seeds per capsule were 14.8. The number of seed set increased 45 % than water spray treatment. Sowed the 92 seeds obtained from first year crossing were got 38 seedlings, 10 plants with well characters in 38 offspring seedlings population were selected to be the parents of pot flower cultivars breeding.
|Appears in Collections:||園藝學系|
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