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挖掘利用野生稻资源有利基因是当前稻作界研究热点之一。研究以常规栽培稻耐低磷品种大粒稻和莲塘早3号,低磷敏感品种新三百粒、沪占七和杂交稻保持系协青早B为对照,采用Yoshida营养液培养法,通过设置10,5,3,0.5,0 mg/L 5个磷浓度水平,5叶1心期时测定苗高、叶龄、黄叶数、茎基宽、根数、倒二叶长和宽、开张角、地上部干重、根干重等性状值,对东乡野生稻东塘下居群苗期低磷耐性进行鉴定。结果表明:东乡野生稻低磷耐性鉴定较适宜的质量浓度为0.5 mg/L,较适宜的简易指标为叶龄相对值、黄叶率;东乡野生稻东塘下居群、大粒稻、莲塘早3号、新三百粒、沪占七、协青早B相对值(0.5 mg/L与完全液比值)中叶龄相对值分别为0.947 8、0.996 6、0.954 9、0.873 7、0.822 5、0.828 2;黄叶率分别为0.35、0.49、0.66、0.67、0.67、0.68。综合看来,东乡野生稻显示出强耐低磷特性。
It is one of the hot spots in current paddy field to excavate and utilize the favorable gene of wild rice resources. In this study, Yoshida nutrient solution culture method was used to study the effects of conventional low-phosphorus tolerant cultivars such as large grain rice and Liantangzao 3, new low phosphorus sensitive varieties 300, Huzhan 7 and hybrid rice maintainer Xieqingzao B, 10, 5, 3, 0.5, and 0 mg / L phosphorus levels. The leaf height, leaf age, yellow leaf number, stem base width, root number, Angle, shoot dry weight, root dry weight and other traits, to appraise the low phosphorus tolerance of Dongtongxia population of Dongxiang. The results showed that the suitable concentration of low phosphorus tolerance of Dongxiang wild rice was 0.5 mg / L, and the more appropriate simple index was relative leaf age and yellow leaf rate. The Dongtongxia population of Dongxiang wild rice, big grain rice, The relative values of middle ages of No.3, No.300, Shanghai accounted for seven and Xieqingzao B relative value (0.5 mg / L and complete liquid ratio) were 0.947 8,0.996 6,0.954 9,0.873 7,0.822 5,0.828 2; yellow leaf rate were 0.35,0.49,0.66,0.67,0.67,0.68. Taken together, Dongxiang Wild Rice shows strong resistance to low-phosphorus characteristics.