牡丹花芽分化类型与促成连续二次开花(英文)

Relationship Between the Types of Flower-bud Differentiation and Forcing Successive Secondary Flowering of Tree Peonies

以135个牡丹品种为试材,归纳了花芽分化数量和梯度类型,将同枝条的芽数聚类为少(3～4)、中等(5～7)、多(8～10)3类;花芽分化梯度为小、中、大3种类型。选取10个代表品种进行促成连续二次开花研究。结果表明,花芽分化数量的多少及梯度的大小直接影响着开花次数,花芽分化数量少、梯度大的品种不能同株促成连续二次开花;花芽分化数量中等或多、梯度小的品种可以同株促成连续二次开花,其中‘如花似玉’二次开花率达75%,且两次开花品质均优良。

The types of flower-bud differentiation in 135 cultivars of tree peonies （Paeo- nia suffruticosa） were identified and grouped as few （3 - 4 ）, medium （ 5 - 7 ） or many （ 8 - 10） in number of flower-buds and small, medium or large in flower-bud differentiation gradient. Ten representative cultivars were chosen and investigated for their behavior in forcing successive secondary flowering. The results indicated that the flower-bud number and differentiation gradient were directly related with secondary flowering. The cultivars with fewer flowerbuds and large differentiation gradient could not be forced for successive secondary flowering in the same plant, while the cultivars with medium-numbered or many flower-buds and small dif- ferentiation gradient flowered successively from January to April 2006 in the same plant by forcing. Among the latter, Paeonia ‘ Ru Hua Si Yu’ had a secondary flowering percentage of 75% and produced good quality flowers during the primary and secondary flowering.