狗牙根花序发育过程的形态学观察

Morphological observation on inflorescence development process of bermudagrass(Cynodon dactylon 'C299')

对狗牙根（Cynodon dactylon‘C299’）花序发育过程中的形态学变化进行了观察。结果表明，‘C299’花序的整个发育过程可分为8个阶段，即营养生长期、穗轴发生期、苞叶原基分化期、小穗原基分化期、小穗分化期、小花分化期、颖片和内外稃发育期及花药和柱头形成期。其中，穗轴发生期（直立茎上有6～9片叶）是抑制花序形成和决定种子产量的关键时期。

The morphological change of inflorescence development of bermudagrass （ Cynodon dactylon ‘C299＇） was observed. The results showed that the inflorescence development process could be preliminarily divided into eight stages, i.e. vegetative growth stage, development stage of spike-stalk, bract primordium differentiation stage, spikelet primordium differentiation stage, spikelet differentiation stage, floret differentiation stage, development stage of glume, lemma and palea, anther and stigma differentiation stage. The development stage of spike-stalk （6 -9 leaves on erect stem） is the critical period of inhibiting inflorescence differentiation, and also deciding seed production.