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12. MORPHOPHYSIOLOGICAL AND BIOCHEMICAL CHARACTERIZATION OF THE EXOTIC CABBAGE (BRASSICA OLERACEA VAR. CAPITATA L.) VARIETIES IN BANGLADESH.

Author

ZAHID, Z. H., HOSHAIN, S., ABUYUSUF, MD., RAHMAN, J. R., RUBEL, M. H., and AHMED, R.

Subjects
*CABBAGE, *PLANT breeders, *COLE crops, *PARAMETER estimation, *FARMERS, *CLUSTER analysis (Statistics), *BLOCK designs
Abstract

Evaluation of nine exotic cabbage varieties and a local variety commenced at the Research Field of the Department of Agriculture, Noakhali Science and Technology University (NSTU), Bangladesh, following a randomized complete block design (RCBD) with three replications. This study aimed to identify the most suitable exotic varieties based on morphophysiological and biochemical traits compared with a check variety. Significant variations (P < 0.01) for all the characteristics, except chlorophyll content, emerged from the study. A highly significant positive association (r ≥ 0.75) was evident for the head diameter of cabbage varieties with head width, stump thickness, core length, and weight with folded and unfolded leaves. On cluster analysis, varieties V2, V3, and V10 were in the same clusters. About the PCA, PC1 accounted for 50.29% of the total variation. However, the maximum plant diameter (65 cm) occurred in V10, and the widest leaf petiole length (8.13 cm) was visible in V3. Yet, the highest head length (13.16 cm), head diameter (19.51 cm), head width (18.33 cm), weight with unfolded leaves (2.00 kg), and weight with folded leaves (1.44 kg) appeared in V10, which are very close to V2 and V3. Also, genetic parameters estimation and heatmap analysis revealed high genetic advance and positive variation, respectively, regarding head diameter, head width, and weight with folded and unfolded leaves. Finally, V2 and V3 varieties could better serve for further genetic improvement for cabbage growers and plant breeders in Bangladesh. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Molecular characterization of Acidovorax citrullistrain NIHHS15-280 causing bacterial fruit blotch disease in Korea and screening of resistance sources in melon

Author

Islam, Md. Rafiqul, Hossain, Mohammad Rashed, Kim, Hoy-Taek, Nath, Ujjal Kumar, Abuyusuf, Md., Jung, Hee-Jeong, Park, Jong-In, and Nou, Ill-Sup

Abstract

Bacterial fruit blotch (BFB), caused by Acidovorax citrulli, is an economically devastating disease in melon. Molecular characterization of causal strains and identification of sources of resistance are necessary to control this important disease. Many strains of BFB were identified by partial sequencing and documented in GenBank. Recently, there was an outbreak of BFB strain NIHHS15-280 in melon fields (Goksung, Jeonnam, Korea) that severely hampered melon production in Korea. For this reason, we characterized NIHHS15-280 by partially sequencing the 16S rRNA gene using PCR-based markers. The partial sequence of the 16S rRNA gene of NIHHS15-280 was much more similar to A. citrullistrains associated with melon and watermelon hosts than other cucurbit hosts. A PCR-based assay identified the strain (NIHHS15-280) as belonging to A. citrulligroup I, which predominantly infects non-watermelon cucurbits (virulent to melon). Thirty-five melon genotypes were screened against NIHHS15-280 in a detached-leaf inoculation assay. The lack of visible disease symptoms 11 days after inoculation in lines PI353814 and PI140471 indicated these to be highly resistant lines, whereas moderate resistance was observed in lines PI420145 and SCNU1154 and cultivars ME6 and ME5. Also, the most resistant lines were corroborated by a fruit inoculation assay. The characterized A. citrullistrain NIHHS15-280 (group I) and identified resistant lines will serve as a valuable resource for further genetic studies and improvement of BFB resistance in melon.

Published
2020
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