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<p>The <i>Musa</i> germplasm consisting of 84 accessions, belonging to AA, AB, AAA, AAB, ABB, AAAA and AAAB genotypes, were screened to understand their responses to Eumusae leaf spot disease caused by <i>Mycosphaerella eumusae</i>. The open field screening for natural infection was performed under the humid, tropical conditions of Banana Research Station, Kerala Agricultural University, India, over three years. The lowest disease severity (2.37 ± 0.23%) was recorded in ‘Calcutta 4’ (AA), while the highest (47.85 ± 7.00%) was in ‘Grand Naine’ (AAA). With higher resistance, there was a delay in the ‘Youngest leaf showing the spots of infection’, which varied from 4.57 ± 0.20 in susceptible ‘Panchabontha’ (ABB) to 8.23 ± 0.35 in resistant ‘Namkanika’ (AAB). Accession ‘Calcutta 4’, which is resistant to yellow and black Sigatoka diseases, and ‘Manoranjitham’ (AAA), which is yellow Sigatoka resistant, were found resistant to Eumusae leaf spot disease also. Additionally, 17 resistant accessions ‘Pisang Lilin’ (AA), ‘Burkel’ (ABB), <i>M. ornate</i> (AA), ‘Malaimonthan’ (ABB), ‘Thiruvananthapuram’ (AAB), ‘Sikuzani’ (AA), ‘Namkanika’ (AAB), ‘Poomkalli’ (AAB), ‘BRS1’ (AAB), ‘Boothibale’ (ABB), ‘Dudhsagar’ (AAB), ‘Rajvazha’ (AAA), ‘FHIA23’ (AAAA), ‘Kalibow’ (ABB), ‘Adakkakunnan’ (AAB), ‘FHIA1’ (AAAB) and ‘BRS2’ (AAB), in the order of resistance, were identified. These resistant accessions offer diverse genetic backgrounds for inclusion in the banana resistance breeding programmes. Cohen’s <i>F</i> test has shown that genomic composition can not be associated with the level of resistance. Inability to associate the resistance to any genome and remarkable variability in percent of disease severity (PDS) within the same genome group suggest that the resistance is multi-genic and multi-allelic.</p>

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Novel sources for Eumusae leaf spot disease resistance in Musa

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Milsha George,
  • K. Anita Cherian,
  • Deepu Mathew

摘要

The Musa germplasm consisting of 84 accessions, belonging to AA, AB, AAA, AAB, ABB, AAAA and AAAB genotypes, were screened to understand their responses to Eumusae leaf spot disease caused by Mycosphaerella eumusae. The open field screening for natural infection was performed under the humid, tropical conditions of Banana Research Station, Kerala Agricultural University, India, over three years. The lowest disease severity (2.37 ± 0.23%) was recorded in ‘Calcutta 4’ (AA), while the highest (47.85 ± 7.00%) was in ‘Grand Naine’ (AAA). With higher resistance, there was a delay in the ‘Youngest leaf showing the spots of infection’, which varied from 4.57 ± 0.20 in susceptible ‘Panchabontha’ (ABB) to 8.23 ± 0.35 in resistant ‘Namkanika’ (AAB). Accession ‘Calcutta 4’, which is resistant to yellow and black Sigatoka diseases, and ‘Manoranjitham’ (AAA), which is yellow Sigatoka resistant, were found resistant to Eumusae leaf spot disease also. Additionally, 17 resistant accessions ‘Pisang Lilin’ (AA), ‘Burkel’ (ABB), M. ornate (AA), ‘Malaimonthan’ (ABB), ‘Thiruvananthapuram’ (AAB), ‘Sikuzani’ (AA), ‘Namkanika’ (AAB), ‘Poomkalli’ (AAB), ‘BRS1’ (AAB), ‘Boothibale’ (ABB), ‘Dudhsagar’ (AAB), ‘Rajvazha’ (AAA), ‘FHIA23’ (AAAA), ‘Kalibow’ (ABB), ‘Adakkakunnan’ (AAB), ‘FHIA1’ (AAAB) and ‘BRS2’ (AAB), in the order of resistance, were identified. These resistant accessions offer diverse genetic backgrounds for inclusion in the banana resistance breeding programmes. Cohen’s F test has shown that genomic composition can not be associated with the level of resistance. Inability to associate the resistance to any genome and remarkable variability in percent of disease severity (PDS) within the same genome group suggest that the resistance is multi-genic and multi-allelic.