HETEROSTYLY AND POLLEN-TUBE INTERACTIONS IN LUCULIA-GRATISSIMA (RUBIACEAE)
HETEROSTYLY AND POLLEN-TUBE INTERACTIONS IN LUCULIA-GRATISSIMA (RUBIACEAE)
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DOI：
10.1093/oxfordjournals.aob.a087988
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发表时间：
1990-06-01
期刊：
影响因子：
4.2
通讯作者：
MURRAY, BG
中科院分区：
文献类型：
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作者：
MURRAY, BG
对茜草科植物Luculia gratissima花部生物学的观察表明，该种为二型花，花药和柱头在两种花型中的位置互补。与针式花相比，本种的二蕊花的特征包括花冠、柱头表面和柱头乳突较大。柱头表面有类似的分泌物，但他们似乎更丰富的线头比针。花二型性伴随着一个非常有效的自交不亲和系统，自交不结实。种子数每蒴果杂交显着更大的thrum花相比，针。不相容的花粉管在24小时内开始在柱头的基部/花柱的顶部在两个变体。切除雌蕊群的这一区域可以消除穗中的自交不亲和反应，但不能消除针形花。用亲和花粉和不亲和花粉混合授粉以及自交和异交花粉的顺序授粉表明，两种类型的花粉管之间存在相互作用。亲和管的存在导致不亲和花粉管顶端过度膨大。不相容的试管似乎对相容试管的生长没有任何影响。
Observations on the floral biology of Luculia gratissima (Rubiaceae) showed that this species is distylous with complementary positioning of anthers and stigmas in the two floral forms. Unusual features of distyly in this species include the larger size of the corolla, the stigma surface and the stigmatic papillae in the thrum flowers compared to the pin ones. Stigmatic surfaces have similar secretions but they appear more copious in thrum than pin. The floral dimorphism was accompanied by a very effective self-incompatibility system and no seed was set on selfing. Seed number per capsule on crossing was significantly greater in thrum flowers compared to pin. Incompatible pollen tubes were initiated within 24 h at the base of the stigma/top of the style in both morphs. Amputation of this region of the gynoecium removed the self-incompatibility reaction in thrum but not pin flowers. Pollination with a mixture of compatible and incompatible pollen and sequential pollination with self followed by cross pollen showed that there were interactions between the two types of pollen tube. The presence of compatible tubes was found to cause the excessive swelling of the pollen-tube tip of the incompatible ones. The incompatible tubes did not appear to have any effect on the growth of compatible ones.