六倍体饲草型小黑麦株高形成特点

Plant Height Characteristics of Hexaploid Triticale (× Triticosecale Wittmack) for Forage

为探索六倍体饲草型小黑麦株高形成特点、明确其株高形成基本规律,以2种类型共6个六倍体小黑麦基因型为材料,对其株高、各节间长、株高构成指数、株高形成动态及株高对外源赤霉素反应特性等进行了研究。结果表明:六倍体饲草型小黑麦的株高极显著高于兼用型小黑麦,主要由于上部节间长度差异较大导致,各节间长中L1对株高的直接贡献最大,L2次之。2种类型小黑麦的株高构成指数间无显著差异。株高形成动态表明饲草型小黑麦的株高形成最快时期较兼用型晚10天左右。饲草型小黑麦株高对外源赤霉素较兼用型小黑麦敏感,且以抽穗期较拔节期更敏感。可见这2种类型六倍体小黑麦在株高形成特点上具有较大差异,这对饲草型小黑麦栽培技术的制定具有一定的指导意义。

To explore the characteristics of hexoploid triticale （× Triticosecale Wittmack） for forage and understand the basic development rules,two types ＇ six hexaploid triticale genotypes were used;and their plant heights,lengths of inter-nodes,plant height compoments and dynamic changes of plant height their plant heights,lengths of inter-nodes,plant height compoments and dynamic changes of plant heights were investigated,and the reaction of triticale plant height to GA 3 were studied in 5 concentrations and at 2 development stages.The results showed that the plant heights of triticale varieties for forage were significant higher than that for food or feed.And the difference of heights is mainly due to the length of upper inter-nodes.The plant height was significantly positive correlation with plant height component factors,length of inter-nodes L 1 and L 2 contributes more to triticale plant-height.No significant difference of plant height components indexes were found between the two types of triticale.The dynamic changes of triticale height indicated that the max development speed of forage triticale about 10 days later than the dual types.GA3 enhanced the plant height more for forage triticale and the enhanced sensitivity was more at heading stages than at shooting stage.These results will supply some theory bases for forage triticale cultivation.