Identification of Sources of Resistance against turcicum leaf blight of maize

Transcription

1 2017; 5(5): P-ISSN: E-ISSN: IJCS 2017; 5(5): IJCS Received: Accepted: Manu TG Gangadhara Naik B Murali R Nagaraja H Correspondence Manu TG Identification of Sources of Resistance against turcicum leaf blight of maize Manu TG, Gangadhara Naik B, Murali R and Nagaraja H Abstract Maize is one of the important cereal crops of India. Maize is utilized as a staple food by the lower strata of the society and also used as a crop par excellence for industrial use. Maize is cultivated under diverse environmental conditions. Among the foliar diseases affecting maize, the turcicum leaf blight is of worldwide importance causing moderate to severe losses in yield. Host plant resistance is considered as most practical, feasible and economical method of plant disease management. Hence 115 inbred lines were screened to know their reaction to turcicum leaf blight disease. Out of which 21 lines showed resistant reaction with a disease score of 1 and 51 lines showed moderately resistant reaction whereas, remaining lines showed moderately susceptible to highly susceptible reaction. Keywords: maize, turcicum leaf blight, resistant, screening Introduction In Indian agriculture, maize occupies an important place after wheat and rice. Maize is not only utilized as a staple food by the lower strata of the society, but it is also used as a crop par excellence for industrial use. Maize is cultivated under diverse environmental conditions. Among the cereals, maize cultivated in India, occupies fifth place in area, third place with respect to production and productivity. During the year , India registered a production of million tonnes with an average productivity of 2.54 tons per hectare from total maize cultivated area of 8.55 million hectares (Anon., 2012) [2]. In Karnataka, maize occupies an area of lakh hectares with the production of lakh tones and productivity of q/ha, which is highest when compared to other states in the country (Anon, 2013) [3]. In Karnatka, Area under maize is increasing rapidly because of congenial environment, high yield and ease with which the crop is cultivated. Thus, there is scope to increase maize productivity in Karnataka to a global level of q/ha (FAOSTAT, 2013) [7]. With the introduction of high yielding hybrids both indigenous and exotic and use of chemical fertilizers, there has been a phenomenal increase in the area and production, but at the same time, it is prone to the attack of several foliar and stalk rot diseases (Payak and Sharma, 1980) [14]. Among the foliar diseases affecting maize, the turcicum leaf blight also called as Northern leaf blight caused by Exserohilum turcicum (Pass.) Leonard and Suggs. (syn. Heliminthosporium turcicum Pass.) is of worldwide importance (Carlos, 1997) [4] causing moderate to severe losses in yield. Turcicum leaf blight is one of the most important fungal diseases affecting photosynthesis with severe reduction in grain yield of more than 50 per cent (Raymundo and Hooker, 1981; Perkins and Pederson, 1987) [17, 16]. The disease is more prevalent in Andhra Pradesh, Karnataka, Bihar, Himachal Pradesh and Maharashtra. Turcicum leaf blight is considered to be one of the most devastating foliar diseases in Karnataka resulting in reduction of grain yield by 28 to 91 per cent (Pandurangegowda, 1991; Harlapur et al., 2000) [13, 8]. Host plant resistance is considered as most practical, feasible and economical method of plant disease management. Hence, it is most important to carry out screening of inbred lines, under artificial epiphytotic conditions to identify sources of resistance against turcicum leaf blight. Material and Methods The present study was carried out in experimental plots of Agriculture College, Navile, Shivamogga in Kharif 2014 and Kharif Totally 115 inbred lines were collected from CIMMYT, Hyderabad to know their reaction to turcicum leaf blight disease under this conditions. ~ 1664 ~

2 The crop was grown by following recommended agronomic practices as per the package of practices. Each genotype was planted at 60 x 30 cm. Two spreader rows with highly susceptible line CM 202 were planted on either side of the screening block. Artificial inoculation of the pathogen was also done to increase the disease pressure and the observations on disease severity was recorded followed by categorization of genotypes as resistant, moderately resistant, susceptible and highly susceptible based on 1-5 disease severity rating scale given by Payak and Sharma 1983 [15]. Disease scoring scale for Turcicum leaf blight disease of Maize Grade Degree of infection 1 Very slight infection, one to two restricted spots (lesions) on lower leaves or traces 2 Slight to moderate infection on lower leaves a few scattered lesions on lower leaves 3 Abundant lesions on lower leaves, few on middle leaves 4 Lesions abundant on lower and middle leaves extending to upper leaves 5 Lesions abundant on all leaves. Plants may be prematurely killed by blight. Inoculum preparation The mass multiplication of the pathogen E. turcicum was prepared on sterilized sorghum grain culture (Joshi et al. 1969) [11]. Required amount of sorghum grains were soaked in water for overnight and excess water was drained off. Soaked sorghum grains were taken in 500 ml conical flask and the material was sterilized at C temperature and at 15lbs pressure for 20 minutes. The flasks containing sterilized sorghum grains were aseptically inoculated with E. turcicum culture and incubated at 27±1 C for 20 days and the flasks were shaken regularly. Within three weeks, the flask of sorghum grains was covered with black mycelial growth and conidia of the fungus. Such fully colonized sporulated sorghum grain culture was used for creating artificial epiphytotic conditions in the field by following leaf whorl drop method of inoculation. Creation of artificial epiphytotic condition To ensure uniform disease infestation, artificial inoculation was done using leaf whorl technique as suggested by Shekhar and Kumar (2012) [18]. The infected sorghum grains with pathogen inoculum was ground to fine powder and 1 to 1.5 gram of the ground inoculum was added to each leaf whorl, followed by a light spray of water to create required humidity and initiate infection and the mixture of infected leaves and water was also sprayed to create artificial epiphytotic conditions. Artificial inoculation was made twice at 25 th and 35 th day after sowing during evening hours to create uniform disease intensity. Results and Discussion The present screening experiment was conducted for two seasons. In kharif 2014, out of 122 lines sown for testing resistance only 80 lines were germinated. Among these 80 lines, 18 lines viz., CML 193, CML 161, CML 436, CML 540, CML 541, CML 542, CML 543, CML 545, CML 344, CML 206, CML 322, CML 448, CML 438, CML 548, CML 547, CML 328, CML 326, VL were found to be resistant with a disease score of 1. In these lines, leaf blight symptoms were not observed or small spots were observed in lower leaves only. Forty seven lines showed a moderately resistant reaction with a disease score of 2 and 10 lines showed moderately susceptible reaction, whereas four lines viz., CML 474, CML 360, CM 212 and CM 500 showed susceptible reaction with a disease score of 4. The susceptible check CM 202 showed highly susceptible reaction with a disease score of 5 (Table 1). In kharif 2015, out of 122 lines seven lines were not germinated. Among these, 26 lines viz., CML 481, CML 344, CML 206, CML 176, CML 496, CML 322, CML 448, CML 438, VL , CML 193, VL , CML 548, CML 547, CML 465, CML 328, CML 326, CML 483, CML 511, VL , VL , VL , VL , CML 229, CML 317, CML 465 and CML 504 showed disease score of 1 and categorized as resistant lines. Forty nine lines showed a moderately resistant reaction with a disease score of 2 and disease rating 3 was found in 34 lines and categorized as moderately susceptible reaction. Five lines viz., CML 470, CML 474, CML 469, CML 502 and CM 500 showed susceptible reaction with a disease rating of 4 and susceptible check CM 202 showed highly susceptible reaction with a disease rating of 5. The two year results revealed that none of the tested lines were immune to the turcicum leaf blight disease. However, 21 lines viz., CML 344, CML 494, CML 481, CML 322, CML 448, CML 438, VL , CML 193, CML 548, CML 547, CML 465, CML 328, CML 326, VL109452, CML 229, CML 317, CML 465, CML 504, VL108723, VL109470, VL showed a resistant reaction with a disease score of 1 for both the years and 51 lines showed a moderate resistant reaction with a disease score of 2 (Table 1). Thirty seven lines showed the moderately susceptible reaction and five lines viz., CML 474, CML 360, CML 502, CM 212, CM 500 showed susceptible reaction. The susceptible check CM 202 showed highly susceptible reaction with a disease rating of 5 (Table 2 and Fig 1). These results were supported by the findings of Chandrashekara et al. (2012) [5], they reported that out of 37 lines tested, 10 lines were found resistant and 18 lines were found moderately resistant. However, 7 lines were found highly susceptible to the turcicum leaf blight. Chandrashekara et al., 2014 [6] found 12 resistant lines out of 35 lines. These results are in agreement with the results of the investigations of Hooda et al. (2012) [9] who screened a set of 200 maize lines against 10 major diseases found and 16 lines found resistant against turcicum leaf blight. Similar results were reported by Jagadeesh (2013) [10] ; Ali and Chowdhary, (2014) [1] and Mir et al. (2015) [12]. The resistant reaction was found to differ among the different lines and this fact agrees with Welz and Gieger (2000) [19] working on turcicum leaf blight reported differential reaction of various maize germplasm to the disease. The reaction of the varieties to the various pathogens is governed by the resistance genotypic composition of lines. ~ 1665 ~

3 Table 1: Reaction of inbred lines to turcicum leaf blight S. No Lines Mean Reaction 1 CML Moderately Resistant 2 CML Moderately Resistant 3 CML 400 * 3 3 Moderately susceptible 4 CML Moderately susceptible 5 CML 345 * 3 3 Moderately susceptible 6 CML 404 * 2 2 Moderately Resistant 7 CML 387 * 2 2 Moderately Resistant 8 CML Moderately Resistant 9 CML 407 * 3 3 Moderately susceptible 10 CML Moderately Resistant 11 CML 344 * 3 3 Moderately susceptible 12 CML 337 * 2 2 Moderately Resistant 13 CML 413 * 3 3 Moderately susceptible 14 CML Moderately susceptible 15 CML 440 * 2 2 Moderately Resistant 16 CML Moderately Resistant 17 CML Moderately Resistant 18 CML Moderately Resistant 19 CML Moderately Resistant 20 CML 491 * 2 2 Moderately Resistant 21 CML 481 * 1 1 Resistant 22 CML Moderately Resistant 23 CML 287 * 3 3 Moderately susceptible 24 CML Moderately Resistant 25 CML Moderately susceptible 26 CML Moderately susceptible 27 CML Moderately susceptible 28 CML Moderately Resistant 29 CML Moderately Resistant 30 CML 509 * 3 3 Moderately susceptible 31 CML Moderately Resistant 32 CML Moderately Resistant 33 CML Moderately Resistant 34 CML Moderately Resistant 35 CML Moderately Resistant 36 CML Moderately Resistant 37 CML Moderately Resistant 38 CML Moderately susceptible 39 CML Moderately Resistant 40 CML Moderately Resistant 41 CML Moderately susceptible 42 CML Moderately Resistant 43 CML Resistant 44 CML Moderately susceptible 45 CML Moderately Resistant 46 CML 425 * 3 3 Moderately susceptible 47 CML 538 * 2 2 Moderately Resistant 48 CML 494 * 3 3 Moderately susceptible 49 CML Resistant 50 CML Moderately Resistant 51 CML Moderately Resistant 52 CML Moderately Resistant 53 CML Moderately Resistant 54 CML 311 * 3 3 Moderately susceptible 55 CML Moderately Resistant 56 CML Resistant 57 CML Resistant 58 CML Moderately susceptible 59 CML Resistant 60 CML Susceptible 61 CML Moderately Resistant 62 VL Moderately Resistant 63 CML 193 * 1 1 Resistant 64 VL * 1 1 Resistant 65 VL * 2 2 Moderately Resistant 66 CML Resistant ~ 1666 ~

4 67 CML Resistant 68 CML Moderately Resistant 69 CML 465 * 1 1 Resistant 70 CML Moderately susceptible 71 CML Moderately susceptible 72 CML Susceptible 73 CML Moderately Resistant 74 CML Moderately susceptible 75 CML 339 * 3 3 Moderately susceptible 76 CML 335 * 2 2 Moderately Resistant 77 CML 333 * 3 3 Moderately susceptible 78 CML Moderately susceptible 79 CML Moderately susceptible 80 CML Moderately susceptible 81 CML Moderately susceptible 82 CML Resistant 83 CML Moderately Resistant 84 CML Moderately Resistant 85 CML Moderately susceptible 86 CML Moderately Resistant 87 CML Moderately susceptible 88 CML Moderately Resistant 89 CML Moderately susceptible 90 CML Resistant 91 CML 445 * 2 2 Moderately Resistant 92 CML Moderately Resistant 93 CML Moderately susceptible 94 CML Moderately susceptible 95 CML Susceptible 96 CML Moderately Resistant 97 CML Moderately Resistant 98 CML Moderately Resistant 99 VL * 1 1 Resistant 100 VL * 1 1 Resistant 101 VL * 1 1 Resistant 102 VL * 2 2 Moderately Resistant 103 VL Resistant 104 CML 229 * 1 1 Resistant 105 CML 317 * 1 1 Resistant 106 CML 465 * 1 1 Resistant 107 CML 504 * 1 1 Resistant 108 CM Highly Susceptible 109 CM Susceptible 110 CM Moderately susceptible 111 CM 122 * 3 3 Moderately susceptible 112 CM Susceptible 113 NAI Moderately susceptible 114 MAI 105 * 2 2 Moderately Resistant 115 HKI Moderately susceptible *= not germinated Table 2: Categorization of lines based on reaction to turcicum leaf blight Reaction No. of Lines Resistant 21 Moderately Resistant 51 Moderately Susceptible 37 Susceptible 5 Highly Susceptible 1 ~ 1667 ~

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