Studies on Variability and Screening of Chickpea Germplasm against Fusarium Oxysporum F. Sp. Ciceri
Author(s): Seethiya Mahajan, Santosh Kumar, Vidhyasagar Verma, Deepak Mahajan, Devendra Kumar and Varsha Bharti
Wilt symptoms in adult plants were quite common at flowering and pod stages. The affected plants showed characteristic wilting viz., drooping of the petioles, rachis and leaflets.All the 50 isolates of F. oxysporum f. sp. ciceriexhibited a great variability in respect of colony diameter, colony characters and pigmentation and were categories into 5 groups (A, B, C, D and E) on the basis of colony characters and pigmentation. Ten isolates of group A recorded colony diameter ranging between 50.3-58.4 mm, 15 isolates of group B had colony diameter (36.4 to 52.8 mm), 17 isolates in group C had colony diameter (40.3-51.60 mm), 6 isolates in group D having colony diameter (46.6 to 57.9 mm) and 2 isolates in group E had colony diameters of 37.3 and 48.8 mm. The size of microconidia ranged between 2.8-4.2 × 1.7-2.4 μm to 6.1-6.6 × 4.1-4.5 μm, the maximum size being recorded in FOC-1 and the minimum in FOC-7; macroconidia ranged between 6.7-7.5× 1.9-2.6 μm and 14.4-17.6 × 5.4-5.7 μm, the maximum size was recorded in FOC-1 and the minimum in FOC-13 and Chlamydospore ranged between 3.7-3.8 μm-6.6-7.0 μm, the maximum size was recorded in FOC-1 and the minimum in FOC-7. Out of 82 genotypes screened, H-82-2, DCP-92-3, Avrodhi and Udaywere found resistant to Fusarium wilt.Virulence response of Foc isolates on chickpea differentials revealed that three different types of pathogenic groups existed in Jammu sub-tropics i.e., highly virulent (FOC-3, FOC-28 and FOC-34), moderately virulent (FOC-1, FOC-25, FOC-32 and FOC-37), and least virulent (FOC-18, FOC-38 and FOC-43).