短蔓西瓜花粉形态及花粉生活力研究.doc

文档介绍：短蔓西瓜花粉形态及花粉生活力研究
摘要: 为探索短蔓西瓜坐瓜较难的原因,对短蔓西瓜和普通二倍体西瓜的花粉生活力和花粉形态结构进行了测定。结果表明,普通二倍体西瓜花粉大小整齐一致,呈短椭球形,极轴和赤道轴比(P/E),而短蔓西瓜的空瘪花粉和畸形花粉较多,花粉大小不一,极轴和赤道轴难以区分,;普通西瓜花粉4 h萌发率达到了98%,而短蔓西瓜花粉的萌发率只有9%,显著低于普通西瓜。因此推测短蔓西瓜坐瓜难可能与花粉萌发率低和花粉畸形有关。
关键词: 短蔓西瓜; 花粉萌发率; 花粉结构
Abstract: In order to find out the reason why fruit setting of short?Cinternode watermelon is difficult, the pollen morphology and viability of short-internode watermelon and normal diploid watermelon were analyzed. The results showed that the pollens of mon diploid watermelon were short ellipsoid shaped with the same size, and the average P/E ratio was . The pollens of short-internode watermelon varied in size, many anomalous and empty pollens were observed, the polar axis and equatorial axis were difficult to distinguish
, the average P/E ratio was . The 4 h germination rate was significant differences between normal watermelon(98%) and short-internode watermelon(9%) pollens. So the lower fruit setting rate of short-internode watermelon might be caused by anomalous pollens and worse germination rate.
Key words: Short-internode watermelon; Pollen germination rate; Pollen structure
西瓜(Citrullus lanatus)是全球广泛种植的园艺作物,中国是西瓜生产与消费大国,,栽培面积和产量均居世界首位[1]。节间长度是西瓜重要的株型性状之一。节间较短的短蔓植株,株型紧凑,适于高密度栽培,在一定程度上能节约土地资源,提高单位面积产量[2],因此短蔓西瓜是西瓜育种中的很重要的种质资源。生产栽培中应用的基本都是长蔓西瓜品种,短蔓西瓜品种较少,挖掘利用短蔓材料对西瓜育种工作具有重要意义。
短蔓西瓜