Groundnut leaf spot is one of the important factors limiting groundnut productivity in Africa particularly in the Democratic Republic of Congo (DR Congo). Early and late leaf spot disease of groundnut caused by Cercos...Groundnut leaf spot is one of the important factors limiting groundnut productivity in Africa particularly in the Democratic Republic of Congo (DR Congo). Early and late leaf spot disease of groundnut caused by Cercospora arachidicola Hori and Cercosporidium personatum (Berk & Curt.) Deighton, respectively, can cause considerable yield losses without fungicide management. The main objectives of this research were to analyze plant and disease developmental cycles. Significant differences were observed among the groundnut varieties evaluated for resistance to the leaf spot disease. The results show that plant development cycle can be divided into three developmental stages. A first stage characterized by a low production of leaves, a second stage with a significant leaf development and finally a third stage with a reduction of leaves. Interestingly, the leaf spot disease cycle was also divided in three stages. The disease stage characterized by the highest level of symptom expression was not associated with the plant phase with the highest emerged leaves. Disease symptoms reached the highest pick only after the phase of intense leaf development. The molecular analysis revealed that all the groundnut varieties analyzed were genetically closely related even though they showed different reactions to the leaf spot disease.展开更多
本文报告了东北地区Cereospora属及相近属72个种,寄生于29科植物上,其中有5个新组合:忍冬短胖孢(Cercosporidium diervillae(Ell.et Ev.) Bai et Cheng);紫穗槐菌绒孢(Mycovellosiella passaloroides(Winter) Bai et Cheng);杯槐假尾孢(...本文报告了东北地区Cereospora属及相近属72个种,寄生于29科植物上,其中有5个新组合:忍冬短胖孢(Cercosporidium diervillae(Ell.et Ev.) Bai et Cheng);紫穗槐菌绒孢(Mycovellosiella passaloroides(Winter) Bai et Cheng);杯槐假尾孢(Pseudocercospora cladrastidis(Jacz.)Bai et Cheng);白头翁假尾孢(Pseudocercospora filiformis(Davis)Bai et Cheng);荚蒾假尾孢(Pseudocercospora varia(Peck)Bai et Cheng),及10个国内新记录种:假酸浆尾孢(Cercospora nicandrae Chupp);美女樱尾孢(Cercospora papillo(?)a Atkinson);苏子尾孢(Cercospora perillae Sawada);车前尾孢(Cercospora p(?)antaginis Sacc.);金光菊尾孢(Cercospora tabacina Ell.et Ev.);毛蕊花生尾孢(Cercospora verbascicola Ell.et Ev.);扁蓄假尾孢(Pseudocercospora avicularis(Winter) Khan et Shamsi);杜鹃假尾孢(Pseudocercospora handelii(Bubak)Deighton);一叶楸假尾孢(Pseudocercospora securingae(Togashi et Kats(?)ki) Deighton);芝麻假尾孢(Pseudocercospora sesami (Hansford) Deighton)。国内新寄主植物科2个;世界新寄主植物属2个;国内新寄主植物属12个;世界新寄主植物种11个;国内新寄主植物种16个。展开更多
本文报道5个新组合:金银忍冬短胖孢(Cercosporidium diervillae(Ell.et Ev.)Bai et Cheng,comb.nov.);紫穗槐菌绒孢(Mvcovellosiella passaloroides(Winter)Bai et Cheng,comb.nov.);朝鲜槐假尾孢(Pseudocercospora cladrastidis(Jacz.)...本文报道5个新组合:金银忍冬短胖孢(Cercosporidium diervillae(Ell.et Ev.)Bai et Cheng,comb.nov.);紫穗槐菌绒孢(Mvcovellosiella passaloroides(Winter)Bai et Cheng,comb.nov.);朝鲜槐假尾孢(Pseudocercospora cladrastidis(Jacz.)Bai et Cheng,comb.nov.);白头翁假尾孢(Pseudocercospora fili]ormis(Davis)Bai et Cheng,comb.nov.)荚蒾假尾孢(Pseudocercospora varia(Peck)Bai et Cheng,comb.nov.)这5个新组合是从Cercospora属转来修正的。展开更多
文摘Groundnut leaf spot is one of the important factors limiting groundnut productivity in Africa particularly in the Democratic Republic of Congo (DR Congo). Early and late leaf spot disease of groundnut caused by Cercospora arachidicola Hori and Cercosporidium personatum (Berk & Curt.) Deighton, respectively, can cause considerable yield losses without fungicide management. The main objectives of this research were to analyze plant and disease developmental cycles. Significant differences were observed among the groundnut varieties evaluated for resistance to the leaf spot disease. The results show that plant development cycle can be divided into three developmental stages. A first stage characterized by a low production of leaves, a second stage with a significant leaf development and finally a third stage with a reduction of leaves. Interestingly, the leaf spot disease cycle was also divided in three stages. The disease stage characterized by the highest level of symptom expression was not associated with the plant phase with the highest emerged leaves. Disease symptoms reached the highest pick only after the phase of intense leaf development. The molecular analysis revealed that all the groundnut varieties analyzed were genetically closely related even though they showed different reactions to the leaf spot disease.
文摘本文报告了东北地区Cereospora属及相近属72个种,寄生于29科植物上,其中有5个新组合:忍冬短胖孢(Cercosporidium diervillae(Ell.et Ev.) Bai et Cheng);紫穗槐菌绒孢(Mycovellosiella passaloroides(Winter) Bai et Cheng);杯槐假尾孢(Pseudocercospora cladrastidis(Jacz.)Bai et Cheng);白头翁假尾孢(Pseudocercospora filiformis(Davis)Bai et Cheng);荚蒾假尾孢(Pseudocercospora varia(Peck)Bai et Cheng),及10个国内新记录种:假酸浆尾孢(Cercospora nicandrae Chupp);美女樱尾孢(Cercospora papillo(?)a Atkinson);苏子尾孢(Cercospora perillae Sawada);车前尾孢(Cercospora p(?)antaginis Sacc.);金光菊尾孢(Cercospora tabacina Ell.et Ev.);毛蕊花生尾孢(Cercospora verbascicola Ell.et Ev.);扁蓄假尾孢(Pseudocercospora avicularis(Winter) Khan et Shamsi);杜鹃假尾孢(Pseudocercospora handelii(Bubak)Deighton);一叶楸假尾孢(Pseudocercospora securingae(Togashi et Kats(?)ki) Deighton);芝麻假尾孢(Pseudocercospora sesami (Hansford) Deighton)。国内新寄主植物科2个;世界新寄主植物属2个;国内新寄主植物属12个;世界新寄主植物种11个;国内新寄主植物种16个。
文摘本文报道5个新组合:金银忍冬短胖孢(Cercosporidium diervillae(Ell.et Ev.)Bai et Cheng,comb.nov.);紫穗槐菌绒孢(Mvcovellosiella passaloroides(Winter)Bai et Cheng,comb.nov.);朝鲜槐假尾孢(Pseudocercospora cladrastidis(Jacz.)Bai et Cheng,comb.nov.);白头翁假尾孢(Pseudocercospora fili]ormis(Davis)Bai et Cheng,comb.nov.)荚蒾假尾孢(Pseudocercospora varia(Peck)Bai et Cheng,comb.nov.)这5个新组合是从Cercospora属转来修正的。
