Response of wheat genotypes against leaf rust (Puccinia triticina) under field conditions (original) (raw)
Related papers
2019
Leaf rust, caused by Puccinia triticina. is an economically important wheat disease which occurs in all the river basin and plain areas of Nepal. Ninety-nine wheat lines that included most of the released genotypes and new advanced breeding lines were subjected to multi-pathotype evaluation of P. triticina both at seedling and adult plant stage at Directorate of Wheat Research (DWR), Shimla, India. Sixteen pathotypes of the pathogen were used for seedling evaluation while the two most predominant pathotypes, 121R63-1 (THTTS) and 21R55 (PHTTL) were used to screen for adult plant resistance (APR). In addition, SSR marker csLV34_Lr34sp was also used for identifying Lr34 gene in these lines. Thirty-five lines were susceptible at seedling and adult plant stages. Different combinations of seven resistance genes, viz Lr1, Lr10, Lr13, Lr19, Lr23, Lr26 and Lr34 were characterized by applying the gene matching technique. The most commonly detected gene was Lr13 (37% of the tested lines), foll...
Indian Journal of Genetics and Plant Breeding (The), 2019
This study aimed to investigate the genetic basis of leafrust resistance in three bread wheat cultivars viz., MP 3288, HI 1418 and HI 784 which have been maintaining high levels of resistance to leaf rust since their release in 2011, 2000, and 1983, respectively. These cultivars also possess leaf tip necrosis phenotype. These were crossed with a susceptible bread wheat cultivar Lal Bahadur and also among themselves in non-reciprocal manner.The F1 , F2 and F3 populations were raised and the inheritance of leaf rust resistance was studied using prevalent and highly virulent Puccinia triticina pathotype 77-5 (121R63-1) during 2014- 17. These studies showed that the field (adult-plant) resistance of these cultivars is governed by two dominant genes each. Closely linked molecular markers L34DINT9F and L34PLUSR revealed the presence of non-race specific adult-plant leaf rust resistance gene Lr34 in all cultivars of present study. Absence of the other documented race nonspecific APR genes ...
Two hundred cultivars/lines were sown on mid of November in wheat experimental area of Ayub Agricultural research institute, Faisalabad. Nurseries were inoculated with Puccinia recondita f. sp. tritici, artificial inoculation was done by different methods by transplanting of rusted plants, rubbing, spraying with rust inoculums and dusting with talcum powder and rust inoculums during the crop season. On the basis of leaf rust severity scale 66 lines were immune against leaf rust, 48 lines were showed durable resistant and remaining 86 were susceptible against leaf rust. AUDPC values of all lines were determined. Slow rusting cultivars corresponded AUDPC value as 65-100 but high rusting lines correspond value above 100. Study showed that epidemiological factors have great influence on the development of leaf rust of wheat. Data showing the correlation of environmental conditions with leaf rust. Cultivars V-17, V-56, V-63, V-119 and V-163 having statistically significant correlation with maximum temperature, 5 cultivars V-17, V-56, V-63, V-119 and V-163 having statistically significant correlation with minimum temperature, While, V-17, V-56, V-63, V-119 and V-163 showing statistically significant correlation with relative humidity, rainfall and wind speed.
International Journal of Phytopathology
Leaf rust caused by Puccinia triticina Eriks. is a fungal disease of wheat (Triticum aestivum L.), which causes considerable yield loss. Host resistance is the most effective and economical method to minimize yield losses caused by leaf rust. The current research was planned to evaluate the response of 93 wheat genotypes lines selected from 716 wheat genotypes delivered to Egypt by International Maize and Wheat Improvement Center (CIMMYT). These genotypes were evaluated against leaf rust resistance under field conditions at two locations i.e. Behira governorate (Itay El-Baroud Agricultural Research Station) and Menoufia governorate during three successive growing seasons i.e. 2017/2018, 2018/2019 and 2019/2020. Results of the current study showed that 47 wheat genotypes were resistant and had the lowest values of final rust severity (FRS %), average coefficient of infection (ACI) and area under disease progress curve (AUDPC). Also, these genotypes showed desirable/acceptable relativ...