TY - JOUR AU - Ooi, K.H AU - SALLEH, B. PY - 2024/01/11 Y2 - 2024/03/28 TI - VEGETATIVE COMPATIBILITY GROUPS OF FUSARIUM OXYSPORUM, THE CAUSAL ORGANISM OF VASCULAR WILT ON ROSELLE IN MALAYSIA JF - BIOTROPIA JA - BIOTROPIA VL - 0 IS - 12 SE - Research Paper DO - 10.11598/btb.1999.0.12.149 UR - https://journal.biotrop.org/index.php/biotropia/article/view/149 SP - AB - Forty strains of Fusarium oxysporvm isolated from roselle (Hibiscus sabdariffa var. sabdariffa) <br />showing vascular wilt symptoms in three states (Terengganu, Penang and Ipoh) in the northern <br />Malaysian Peninsula were used to investigate the vegetative compatibility. Nitrate-nonutilizing (nil) <br />mutants were recovered from all the strains tested and subsequently used to study vegetative <br />compatibility groups (VCG) within the population by nit mutants pairings on minimal medium. Thirteen <br />VCGs were found and none were vegetatively compatible with those of other formae speciales (f. spp.) <br />such as asparagi and cubense, and non-pathogenic strains from paddy and oil palm. The results indicate <br />that there is substantial genetic diversity in F. oxysporum that causes vascular wilt disease on roselle as <br />reflected by multiple VCGs, but the distribution of strains into the VCGs is not even as there are 26 <br />representatives in VCG-1001M, two in VCG-1003M and VCG-1013M and only one in the other VCGs. <br />This study may provide new insight into the establishment of a new forma specialis off. oxysporum. <br />Key words: Vegetative Compatibility Groups/M/ mutants/fitsarium oxysporwrn/Roselle/Vascular wilt/ <br />Malaysia. ER -