小麦品种抗禾谷胞囊线虫机制的初步研究

A Preliminary Study on the Resistance Mechanism of Wheat Cultivars to Cereal Cyst Nematode

对小麦品种抗胞囊线虫病的机制进行了初步研究。发现不同抗、感品种根系形态存在一定的差异,品种抗性与侧根数量呈负相关,抗病品种侧根数量比感病品种少。对苗期和分蘖期侧根横切面石蜡切片观察发现,感病品种侧根横切面表皮的薄壁细胞圆形,细胞与细胞之间的空隙较大,排列疏松;抗病品种侧根横切面表皮的薄壁细胞是椭圆形或方砖形,细胞与细胞之间的空隙比较小,排列比较紧。根系分泌物对胞囊线虫卵孵化影响的试验结果表明,小麦对胞囊线虫病的抗性与根系分泌物无明显相关性。

The resistance mechanism of wheat cultivars to CCN were analyzed by observing root shape and cell structure, and testing the effect of root secretion on egg hatching. The results suggested that there was a negative relationship between the resistance and the number of lateral root. The number of resistant cultivars＇ lateral roots were much less than susceptible cultivars. The coat cell structure of resistant and susceptible cultivars was observed by paraffin slice up. The results showed that the coat parenchyma cells of resistant cultivar in seedling stage and tillering stage were more compact than susceptible cultivar. The shape of lateral root coat parenchyma cell of resistant cultivar was smaller, ellipse or brick, but susceptible cultivar＇s was bigger and circular. Study on the effects of root secretion from resistant and susceptible cultivar on the egg hatch indicated that there were no difference in the effect of root secretion between the sus- ceptible cultivars and resistance cultivars for egg hatching.