Centre of Advanced Study, Department of Botany, University of Calcutta, 35, B.C. Road, Kolkata, 00019, India.
Centre of Advanced Study, Department of Botany, University of Calcutta, 35, B.C. Road, Kolkata, 00019, India; Department of Botany, Vidyanagar College, West Bengal, 743503, India.
Fungal Biol. 2020 Nov;124(11):958-968. doi: 10.1016/j.funbio.2020.08.003. Epub 2020 Aug 22.
Silicified fossil legume woods of Cynometroxylon Chowdhury & Ghosh collected from the Neogene (late Miocene) sediments of the Bengal Basin, eastern India, exhibit fungal decay seldom found in the fossil record. The wood possesses numerous perforate areas on the surface that seem to be the result of extensive fungal activity. In transverse section, the decayed areas (pockets) appear irregular to ellipsoidal in outline; in longitudinal section these areas of disrupted tissue are somewhat spindle-shaped. Individual pockets are randomly scattered throughout the secondary xylem or are restricted to a narrow zone. The aforesaid patterns of decay in fossil wood show similarities with that of white rot decay commonly produced by higher fungi, specifically basidiomycetes and ascomycetes. The host fossil wood harbors abundant ramifying and septate fungal hyphae with knob like swellings similar to pseudoclamps in basidiomycetes, and three-celled conidia-like reproductive structures. This record expands our current knowledge of wood decaying fungi-host plant interaction in the Neogene tropical forests of Peninsular India.
从印度东部孟加拉盆地新近纪（晚中新世）沉积物中采集到的硅化化石豆科木具有在化石记录中很少发现的真菌腐朽。木材表面有许多穿孔区域，似乎是真菌活动的结果。在横切面上，腐朽区域（口袋）呈不规则的椭圆形；在纵切面上，这些组织破坏区域呈梭形。单个口袋随机分布在次生木质部中，或者局限于一个狭窄的区域。化石木材中上述腐朽模式与高等真菌（特别是担子菌和子囊菌）通常产生的白色腐朽相似。宿主化石木材中含有大量分枝和分隔的真菌菌丝，具有类似于担子菌中假节的瘤状肿胀，以及三细胞似分生孢子的生殖结构。这一记录扩展了我们对印度半岛新近纪热带森林中木材腐朽真菌与宿主植物相互作用的现有认识。
