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Evaluation of advanced breeding lines for Alternaria leaf blight in groundnut

Evaluation of advanced breeding lines for Alternaria leaf blight in groundnut. Narendra Kumar *, Ajay BC, Jadon KS, Dagla MC Gangadhara K, Praveen Kona, Rathanakumar AL Radhakrishnan T, Makwana AD and Chikani BM. ICAR-Directorate of Groundnut Research Junagadh , Gujarat, India.

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Evaluation of advanced breeding lines for Alternaria leaf blight in groundnut

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  1. Evaluation of advanced breeding lines for Alternaria leaf blight in groundnut Narendra Kumar*, Ajay BC, Jadon KS, Dagla MC Gangadhara K, Praveen Kona, Rathanakumar AL Radhakrishnan T, Makwana AD and Chikani BM ICAR-Directorate of Groundnut Research Junagadh, Gujarat, India

  2. Alternaria Leaf Blight– A foliar fungal disease • Alternaria is an opportunistic pathogen causing leaf spots, rots and blights on over 380 host species of plant. • Importance of this disease is also emphasized by a detailed survey in Andhra Pradesh, Karnataka and Tamil Nadu (Subrahmanyam et al. 1981). • There are different species of Alternaria causing leaf spot and blight diseases in groundnut • Necrotic brown leaf spot (Alternaria arachidis Kulk.)-first described Kulkarni (1974) • Leaf blight (Alternaria alternata (Fr.) Keissler)-Balasubramanian (1979) also confirm by Subrahmanyam et al. (1981), Vyas et al.(1985) and Narain et al.(1987). • Leaf blight (Alternaria tenuissima (Kunze. Fr) Wiltshire)- Ghewande et al. (1982), Patil and Hiremath (1989). • Necrotic leaf spots (Alternaria longipes)- Giri and Murugesan (1996).

  3. Economic importance • Economic importance in major groundnut growing areas of rabi-summer in Gujarat, Karnataka, Andhra Pradesh and Tamil Nadu and Maharashtra in about 6.62lakh ha. • Economic importance the biology and pathology of this pathogen has been studied (Narayanaswamy 1980, Prasad and Reddy 1986, 1987). • The intensity of this disease varies from 15-35% Ghewande et al. (1982). • Alternaria leaf blight reduced 13-22% pod yield, 24-63% haulm yield and it also affects kernel quality in groundnut (Kumar et al. 2012).

  4. Objectives • To study genetic variability for Alternaria leaf blight. • To study relationship of pod yield with all the studied traits . • To identify sources of resistance to Alternaria leaf blight.

  5. Experimental details Observations recorded

  6. Field view of screening plot

  7. Pooled ANOVA

  8. Genotypic performance based on yield

  9. Genotypes identified Alternaria leaf blight Iron chlorosis

  10. Correlation

  11. Conclusion • Significant genotypic differences was observed for Alternaria leaf blight and other traits. • High yielding genotypes had more tolerant to Alternaria leaf blight, iron chlorosis, high shelling out-turn, short duration, high HKW, high SCMR, low SLA than low yielders. • Pod yield is positively correlated with SOT and SCMR80 while it was negatively correlated with iron chlorosis. • Correlation study clearly indicated that Alternaria leaf blight is positively correlated with iron chlorosis. • PBS 12169 and PBS 12190 could be used as new source of resistance in breeding programme. • PBS 12194 and PBS 12198 –identified high yielding along with tolerant to iron chlorosis

  12. Thanking you

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