Resistant sources in groundnut germplasm lines against peanut bud necrosis tospovirus disease

Abstract

Of the 242 groundnut genotypes, tested both in epiphytotic field and laboratory conditions, the genotypes viz., ICGV 90009, ICGV 86699, ICGV 86329, 91177, 91234, ICGV-94252 and TG 26 were found promising both with low incidence of PBND besides longer incubation periods, DFSA, DLSA and IP 50%. Further, significant positive correlation was found between IP 50% vs DLSA, DFSA and final PBND (%) was negatively correlated with IP 50% and DFSA.

Search for Potential Sources of Resistance among Interspecific Derivatives of Peanut against Peanut Bud Necrosis Disease

“…The cultivar with ability to delay the initiation of symptom will have less final disease pressure (Gopal et al, 2010). So, these epidemiological may very useful in finding out the resistant sources against PBND where, the disease resistance seem to be quantitative nature and there is no complete resistance available against the virus and most of the available sources are of field resistant only.…”

“…There are nine genotypes viz., CS-43, CS-45, CS-51, CS-54, CS-55, CS-73, CS-77, CS-82 and CS-104 which exhibited as resistance reaction in field behaved as moderately resistant in glasshouse tests. The results are in accordance with earlier findings where in genotypes viz., ICGV-0009, ICGV-86699, ICGV-88329, ICGV-91177, ICGV-91234 and ICGV-94252 exhibited partial resistance to PBNV under epiphytotic field and laboratory tests (Gopal et al, 2010). Among nine genotypes, seven genotypes viz., CS-43, CS-54, CS-55, CS-73, CS-77, CS-82 and CS-104 recorded promising yield and yield parameters like pod yield per plant (20.6-25.4g), shelling per cent (71-74%), 100 seed weight (31-35g), SMK (89-72%) and oil content (38-40%) and also desirable pod features of farmers (Table 2).…”

“…A susceptible check (cv. KRG-1) was planted with spacing of 45 and 15 cm between rows and plants respectively and initial plant count was recorded in all genotypes at 15 DAS and infected plants were marked with bamboo sticks (0.5 m) to avoid missing of early infected plants as they usually die (Gopal et al, 2010). The PBND reaction in each genotypes was recorded a week before harvest of the crop.…”

“…In India, on the basis of PBND severity, Raichur (Karnataka, India) has been identified as one among the seven "hot-spots" for PBND (Basu 1995). In field condition, genotypes can reacts differentially to PBND incidence due to cumulative effects of resistance to virus and resistance to vector (Gopal et al, 2010). The decrease in the yield loss with delayed infection may be attributed to adult plant resistance (Nagarajan and Muralidharan 1995).…”

“…Presently growing most of the cultivars have been released on the basis of its superior yield and acceptable seed quality performance. If there is a restriction in use of pesticides, farmers has to agree with lower yields or use resistant varieties (Gopal et al, 2010). In recent years, peanut bud necrosis disease (PBND) is considered as important disease of peanut in south and south-east Asia (Lava kumar et al, 2007a;Reddy et al, 1992).…”